linux/drivers/gpu/drm/drm_atomic_helper.c
Maxime Ripard eca22edb37
drm: Pass the full state to connectors atomic functions
The current atomic helpers have either their object state being passed as
an argument or the full atomic state.

The former is the pattern that was done at first, before switching to the
latter for new hooks or when it was needed.

Now that the CRTCs have been converted, let's move forward with the
connectors to provide a consistent interface.

The conversion was done using the coccinelle script below, and built tested
on all the drivers.

@@
identifier connector, connector_state;
@@

 struct drm_connector_helper_funcs {
	...
	struct drm_encoder* (*atomic_best_encoder)(struct drm_connector *connector,
-						   struct drm_connector_state *connector_state);
+						   struct drm_atomic_state *state);
	...
}

@@
identifier connector, connector_state;
@@

 struct drm_connector_helper_funcs {
	...
	void (*atomic_commit)(struct drm_connector *connector,
-			      struct drm_connector_state *connector_state);
+			      struct drm_atomic_state *state);
	...
}

@@
struct drm_connector_helper_funcs *FUNCS;
identifier state;
identifier connector, connector_state;
identifier f;
@@

 f(..., struct drm_atomic_state *state, ...)
 {
	<+...
-	FUNCS->atomic_commit(connector, connector_state);
+	FUNCS->atomic_commit(connector, state);
	...+>
 }

@@
struct drm_connector_helper_funcs *FUNCS;
identifier state;
identifier connector, connector_state;
identifier var, f;
@@

 f(struct drm_atomic_state *state, ...)
 {
	<+...
-	var = FUNCS->atomic_best_encoder(connector, connector_state);
+	var = FUNCS->atomic_best_encoder(connector, state);
	...+>
 }

@ connector_atomic_func @
identifier helpers;
identifier func;
@@

(
static struct drm_connector_helper_funcs helpers = {
	...,
	.atomic_best_encoder = func,
	...,
};
|
static struct drm_connector_helper_funcs helpers = {
	...,
	.atomic_commit = func,
	...,
};
)

@@
identifier connector_atomic_func.func;
identifier connector;
symbol state;
@@

 func(struct drm_connector *connector,
-      struct drm_connector_state *state
+      struct drm_connector_state *connector_state
      )
 {
	...
-	state
+	connector_state
 	...
 }

@ ignores_state @
identifier connector_atomic_func.func;
identifier connector, connector_state;
@@

 func(struct drm_connector *connector,
      struct drm_connector_state *connector_state)
{
	... when != connector_state
}

@ adds_state depends on connector_atomic_func && !ignores_state @
identifier connector_atomic_func.func;
identifier connector, connector_state;
@@

 func(struct drm_connector *connector, struct drm_connector_state *connector_state)
 {
+	struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state, connector);
	...
 }

@ depends on connector_atomic_func @
identifier connector_atomic_func.func;
identifier connector_state;
identifier connector;
@@

 func(struct drm_connector *connector,
-     struct drm_connector_state *connector_state
+     struct drm_atomic_state *state
	   )
 { ... }

@ include depends on adds_state @
@@

 #include <drm/drm_atomic.h>

@ no_include depends on !include && adds_state @
@@

+ #include <drm/drm_atomic.h>
  #include <drm/...>

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Cc: Melissa Wen <melissa.srw@gmail.com>
Cc: Haneen Mohammed <hamohammed.sa@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201118094758.506730-1-maxime@cerno.tech
2020-11-20 12:23:53 +01:00

3612 lines
110 KiB
C

/*
* Copyright (C) 2014 Red Hat
* Copyright (C) 2014 Intel Corp.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Rob Clark <robdclark@gmail.com>
* Daniel Vetter <daniel.vetter@ffwll.ch>
*/
#include <linux/dma-fence.h>
#include <linux/ktime.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_bridge.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_print.h>
#include <drm/drm_self_refresh_helper.h>
#include <drm/drm_vblank.h>
#include <drm/drm_writeback.h>
#include "drm_crtc_helper_internal.h"
#include "drm_crtc_internal.h"
/**
* DOC: overview
*
* This helper library provides implementations of check and commit functions on
* top of the CRTC modeset helper callbacks and the plane helper callbacks. It
* also provides convenience implementations for the atomic state handling
* callbacks for drivers which don't need to subclass the drm core structures to
* add their own additional internal state.
*
* This library also provides default implementations for the check callback in
* drm_atomic_helper_check() and for the commit callback with
* drm_atomic_helper_commit(). But the individual stages and callbacks are
* exposed to allow drivers to mix and match and e.g. use the plane helpers only
* together with a driver private modeset implementation.
*
* This library also provides implementations for all the legacy driver
* interfaces on top of the atomic interface. See drm_atomic_helper_set_config(),
* drm_atomic_helper_disable_plane(), drm_atomic_helper_disable_plane() and the
* various functions to implement set_property callbacks. New drivers must not
* implement these functions themselves but must use the provided helpers.
*
* The atomic helper uses the same function table structures as all other
* modesetting helpers. See the documentation for &struct drm_crtc_helper_funcs,
* struct &drm_encoder_helper_funcs and &struct drm_connector_helper_funcs. It
* also shares the &struct drm_plane_helper_funcs function table with the plane
* helpers.
*/
static void
drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
struct drm_plane_state *old_plane_state,
struct drm_plane_state *plane_state,
struct drm_plane *plane)
{
struct drm_crtc_state *crtc_state;
if (old_plane_state->crtc) {
crtc_state = drm_atomic_get_new_crtc_state(state,
old_plane_state->crtc);
if (WARN_ON(!crtc_state))
return;
crtc_state->planes_changed = true;
}
if (plane_state->crtc) {
crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
if (WARN_ON(!crtc_state))
return;
crtc_state->planes_changed = true;
}
}
static int handle_conflicting_encoders(struct drm_atomic_state *state,
bool disable_conflicting_encoders)
{
struct drm_connector_state *new_conn_state;
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
struct drm_encoder *encoder;
unsigned encoder_mask = 0;
int i, ret = 0;
/*
* First loop, find all newly assigned encoders from the connectors
* part of the state. If the same encoder is assigned to multiple
* connectors bail out.
*/
for_each_new_connector_in_state(state, connector, new_conn_state, i) {
const struct drm_connector_helper_funcs *funcs = connector->helper_private;
struct drm_encoder *new_encoder;
if (!new_conn_state->crtc)
continue;
if (funcs->atomic_best_encoder)
new_encoder = funcs->atomic_best_encoder(connector,
state);
else if (funcs->best_encoder)
new_encoder = funcs->best_encoder(connector);
else
new_encoder = drm_connector_get_single_encoder(connector);
if (new_encoder) {
if (encoder_mask & drm_encoder_mask(new_encoder)) {
DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] on [CONNECTOR:%d:%s] already assigned\n",
new_encoder->base.id, new_encoder->name,
connector->base.id, connector->name);
return -EINVAL;
}
encoder_mask |= drm_encoder_mask(new_encoder);
}
}
if (!encoder_mask)
return 0;
/*
* Second loop, iterate over all connectors not part of the state.
*
* If a conflicting encoder is found and disable_conflicting_encoders
* is not set, an error is returned. Userspace can provide a solution
* through the atomic ioctl.
*
* If the flag is set conflicting connectors are removed from the CRTC
* and the CRTC is disabled if no encoder is left. This preserves
* compatibility with the legacy set_config behavior.
*/
drm_connector_list_iter_begin(state->dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
struct drm_crtc_state *crtc_state;
if (drm_atomic_get_new_connector_state(state, connector))
continue;
encoder = connector->state->best_encoder;
if (!encoder || !(encoder_mask & drm_encoder_mask(encoder)))
continue;
if (!disable_conflicting_encoders) {
DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s] by [CONNECTOR:%d:%s]\n",
encoder->base.id, encoder->name,
connector->state->crtc->base.id,
connector->state->crtc->name,
connector->base.id, connector->name);
ret = -EINVAL;
goto out;
}
new_conn_state = drm_atomic_get_connector_state(state, connector);
if (IS_ERR(new_conn_state)) {
ret = PTR_ERR(new_conn_state);
goto out;
}
DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], disabling [CONNECTOR:%d:%s]\n",
encoder->base.id, encoder->name,
new_conn_state->crtc->base.id, new_conn_state->crtc->name,
connector->base.id, connector->name);
crtc_state = drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
ret = drm_atomic_set_crtc_for_connector(new_conn_state, NULL);
if (ret)
goto out;
if (!crtc_state->connector_mask) {
ret = drm_atomic_set_mode_prop_for_crtc(crtc_state,
NULL);
if (ret < 0)
goto out;
crtc_state->active = false;
}
}
out:
drm_connector_list_iter_end(&conn_iter);
return ret;
}
static void
set_best_encoder(struct drm_atomic_state *state,
struct drm_connector_state *conn_state,
struct drm_encoder *encoder)
{
struct drm_crtc_state *crtc_state;
struct drm_crtc *crtc;
if (conn_state->best_encoder) {
/* Unset the encoder_mask in the old crtc state. */
crtc = conn_state->connector->state->crtc;
/* A NULL crtc is an error here because we should have
* duplicated a NULL best_encoder when crtc was NULL.
* As an exception restoring duplicated atomic state
* during resume is allowed, so don't warn when
* best_encoder is equal to encoder we intend to set.
*/
WARN_ON(!crtc && encoder != conn_state->best_encoder);
if (crtc) {
crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
crtc_state->encoder_mask &=
~drm_encoder_mask(conn_state->best_encoder);
}
}
if (encoder) {
crtc = conn_state->crtc;
WARN_ON(!crtc);
if (crtc) {
crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
crtc_state->encoder_mask |=
drm_encoder_mask(encoder);
}
}
conn_state->best_encoder = encoder;
}
static void
steal_encoder(struct drm_atomic_state *state,
struct drm_encoder *encoder)
{
struct drm_crtc_state *crtc_state;
struct drm_connector *connector;
struct drm_connector_state *old_connector_state, *new_connector_state;
int i;
for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
struct drm_crtc *encoder_crtc;
if (new_connector_state->best_encoder != encoder)
continue;
encoder_crtc = old_connector_state->crtc;
DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], stealing it\n",
encoder->base.id, encoder->name,
encoder_crtc->base.id, encoder_crtc->name);
set_best_encoder(state, new_connector_state, NULL);
crtc_state = drm_atomic_get_new_crtc_state(state, encoder_crtc);
crtc_state->connectors_changed = true;
return;
}
}
static int
update_connector_routing(struct drm_atomic_state *state,
struct drm_connector *connector,
struct drm_connector_state *old_connector_state,
struct drm_connector_state *new_connector_state)
{
const struct drm_connector_helper_funcs *funcs;
struct drm_encoder *new_encoder;
struct drm_crtc_state *crtc_state;
DRM_DEBUG_ATOMIC("Updating routing for [CONNECTOR:%d:%s]\n",
connector->base.id,
connector->name);
if (old_connector_state->crtc != new_connector_state->crtc) {
if (old_connector_state->crtc) {
crtc_state = drm_atomic_get_new_crtc_state(state, old_connector_state->crtc);
crtc_state->connectors_changed = true;
}
if (new_connector_state->crtc) {
crtc_state = drm_atomic_get_new_crtc_state(state, new_connector_state->crtc);
crtc_state->connectors_changed = true;
}
}
if (!new_connector_state->crtc) {
DRM_DEBUG_ATOMIC("Disabling [CONNECTOR:%d:%s]\n",
connector->base.id,
connector->name);
set_best_encoder(state, new_connector_state, NULL);
return 0;
}
crtc_state = drm_atomic_get_new_crtc_state(state,
new_connector_state->crtc);
/*
* For compatibility with legacy users, we want to make sure that
* we allow DPMS On->Off modesets on unregistered connectors. Modesets
* which would result in anything else must be considered invalid, to
* avoid turning on new displays on dead connectors.
*
* Since the connector can be unregistered at any point during an
* atomic check or commit, this is racy. But that's OK: all we care
* about is ensuring that userspace can't do anything but shut off the
* display on a connector that was destroyed after it's been notified,
* not before.
*
* Additionally, we also want to ignore connector registration when
* we're trying to restore an atomic state during system resume since
* there's a chance the connector may have been destroyed during the
* process, but it's better to ignore that then cause
* drm_atomic_helper_resume() to fail.
*/
if (!state->duplicated && drm_connector_is_unregistered(connector) &&
crtc_state->active) {
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] is not registered\n",
connector->base.id, connector->name);
return -EINVAL;
}
funcs = connector->helper_private;
if (funcs->atomic_best_encoder)
new_encoder = funcs->atomic_best_encoder(connector, state);
else if (funcs->best_encoder)
new_encoder = funcs->best_encoder(connector);
else
new_encoder = drm_connector_get_single_encoder(connector);
if (!new_encoder) {
DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n",
connector->base.id,
connector->name);
return -EINVAL;
}
if (!drm_encoder_crtc_ok(new_encoder, new_connector_state->crtc)) {
DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] incompatible with [CRTC:%d:%s]\n",
new_encoder->base.id,
new_encoder->name,
new_connector_state->crtc->base.id,
new_connector_state->crtc->name);
return -EINVAL;
}
if (new_encoder == new_connector_state->best_encoder) {
set_best_encoder(state, new_connector_state, new_encoder);
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d:%s]\n",
connector->base.id,
connector->name,
new_encoder->base.id,
new_encoder->name,
new_connector_state->crtc->base.id,
new_connector_state->crtc->name);
return 0;
}
steal_encoder(state, new_encoder);
set_best_encoder(state, new_connector_state, new_encoder);
crtc_state->connectors_changed = true;
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d:%s]\n",
connector->base.id,
connector->name,
new_encoder->base.id,
new_encoder->name,
new_connector_state->crtc->base.id,
new_connector_state->crtc->name);
return 0;
}
static int
mode_fixup(struct drm_atomic_state *state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *new_crtc_state;
struct drm_connector *connector;
struct drm_connector_state *new_conn_state;
int i;
int ret;
for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
if (!new_crtc_state->mode_changed &&
!new_crtc_state->connectors_changed)
continue;
drm_mode_copy(&new_crtc_state->adjusted_mode, &new_crtc_state->mode);
}
for_each_new_connector_in_state(state, connector, new_conn_state, i) {
const struct drm_encoder_helper_funcs *funcs;
struct drm_encoder *encoder;
struct drm_bridge *bridge;
WARN_ON(!!new_conn_state->best_encoder != !!new_conn_state->crtc);
if (!new_conn_state->crtc || !new_conn_state->best_encoder)
continue;
new_crtc_state =
drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
/*
* Each encoder has at most one connector (since we always steal
* it away), so we won't call ->mode_fixup twice.
*/
encoder = new_conn_state->best_encoder;
funcs = encoder->helper_private;
bridge = drm_bridge_chain_get_first_bridge(encoder);
ret = drm_atomic_bridge_chain_check(bridge,
new_crtc_state,
new_conn_state);
if (ret) {
DRM_DEBUG_ATOMIC("Bridge atomic check failed\n");
return ret;
}
if (funcs && funcs->atomic_check) {
ret = funcs->atomic_check(encoder, new_crtc_state,
new_conn_state);
if (ret) {
DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] check failed\n",
encoder->base.id, encoder->name);
return ret;
}
} else if (funcs && funcs->mode_fixup) {
ret = funcs->mode_fixup(encoder, &new_crtc_state->mode,
&new_crtc_state->adjusted_mode);
if (!ret) {
DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] fixup failed\n",
encoder->base.id, encoder->name);
return -EINVAL;
}
}
}
for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
const struct drm_crtc_helper_funcs *funcs;
if (!new_crtc_state->enable)
continue;
if (!new_crtc_state->mode_changed &&
!new_crtc_state->connectors_changed)
continue;
funcs = crtc->helper_private;
if (!funcs || !funcs->mode_fixup)
continue;
ret = funcs->mode_fixup(crtc, &new_crtc_state->mode,
&new_crtc_state->adjusted_mode);
if (!ret) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] fixup failed\n",
crtc->base.id, crtc->name);
return -EINVAL;
}
}
return 0;
}
static enum drm_mode_status mode_valid_path(struct drm_connector *connector,
struct drm_encoder *encoder,
struct drm_crtc *crtc,
const struct drm_display_mode *mode)
{
struct drm_bridge *bridge;
enum drm_mode_status ret;
ret = drm_encoder_mode_valid(encoder, mode);
if (ret != MODE_OK) {
DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] mode_valid() failed\n",
encoder->base.id, encoder->name);
return ret;
}
bridge = drm_bridge_chain_get_first_bridge(encoder);
ret = drm_bridge_chain_mode_valid(bridge, &connector->display_info,
mode);
if (ret != MODE_OK) {
DRM_DEBUG_ATOMIC("[BRIDGE] mode_valid() failed\n");
return ret;
}
ret = drm_crtc_mode_valid(crtc, mode);
if (ret != MODE_OK) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] mode_valid() failed\n",
crtc->base.id, crtc->name);
return ret;
}
return ret;
}
static int
mode_valid(struct drm_atomic_state *state)
{
struct drm_connector_state *conn_state;
struct drm_connector *connector;
int i;
for_each_new_connector_in_state(state, connector, conn_state, i) {
struct drm_encoder *encoder = conn_state->best_encoder;
struct drm_crtc *crtc = conn_state->crtc;
struct drm_crtc_state *crtc_state;
enum drm_mode_status mode_status;
const struct drm_display_mode *mode;
if (!crtc || !encoder)
continue;
crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
if (!crtc_state)
continue;
if (!crtc_state->mode_changed && !crtc_state->connectors_changed)
continue;
mode = &crtc_state->mode;
mode_status = mode_valid_path(connector, encoder, crtc, mode);
if (mode_status != MODE_OK)
return -EINVAL;
}
return 0;
}
/**
* drm_atomic_helper_check_modeset - validate state object for modeset changes
* @dev: DRM device
* @state: the driver state object
*
* Check the state object to see if the requested state is physically possible.
* This does all the CRTC and connector related computations for an atomic
* update and adds any additional connectors needed for full modesets. It calls
* the various per-object callbacks in the follow order:
*
* 1. &drm_connector_helper_funcs.atomic_best_encoder for determining the new encoder.
* 2. &drm_connector_helper_funcs.atomic_check to validate the connector state.
* 3. If it's determined a modeset is needed then all connectors on the affected
* CRTC are added and &drm_connector_helper_funcs.atomic_check is run on them.
* 4. &drm_encoder_helper_funcs.mode_valid, &drm_bridge_funcs.mode_valid and
* &drm_crtc_helper_funcs.mode_valid are called on the affected components.
* 5. &drm_bridge_funcs.mode_fixup is called on all encoder bridges.
* 6. &drm_encoder_helper_funcs.atomic_check is called to validate any encoder state.
* This function is only called when the encoder will be part of a configured CRTC,
* it must not be used for implementing connector property validation.
* If this function is NULL, &drm_atomic_encoder_helper_funcs.mode_fixup is called
* instead.
* 7. &drm_crtc_helper_funcs.mode_fixup is called last, to fix up the mode with CRTC constraints.
*
* &drm_crtc_state.mode_changed is set when the input mode is changed.
* &drm_crtc_state.connectors_changed is set when a connector is added or
* removed from the CRTC. &drm_crtc_state.active_changed is set when
* &drm_crtc_state.active changes, which is used for DPMS.
* &drm_crtc_state.no_vblank is set from the result of drm_dev_has_vblank().
* See also: drm_atomic_crtc_needs_modeset()
*
* IMPORTANT:
*
* Drivers which set &drm_crtc_state.mode_changed (e.g. in their
* &drm_plane_helper_funcs.atomic_check hooks if a plane update can't be done
* without a full modeset) _must_ call this function afterwards after that
* change. It is permitted to call this function multiple times for the same
* update, e.g. when the &drm_crtc_helper_funcs.atomic_check functions depend
* upon the adjusted dotclock for fifo space allocation and watermark
* computation.
*
* RETURNS:
* Zero for success or -errno
*/
int
drm_atomic_helper_check_modeset(struct drm_device *dev,
struct drm_atomic_state *state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
struct drm_connector *connector;
struct drm_connector_state *old_connector_state, *new_connector_state;
int i, ret;
unsigned connectors_mask = 0;
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
bool has_connectors =
!!new_crtc_state->connector_mask;
WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
if (!drm_mode_equal(&old_crtc_state->mode, &new_crtc_state->mode)) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] mode changed\n",
crtc->base.id, crtc->name);
new_crtc_state->mode_changed = true;
}
if (old_crtc_state->enable != new_crtc_state->enable) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enable changed\n",
crtc->base.id, crtc->name);
/*
* For clarity this assignment is done here, but
* enable == 0 is only true when there are no
* connectors and a NULL mode.
*
* The other way around is true as well. enable != 0
* iff connectors are attached and a mode is set.
*/
new_crtc_state->mode_changed = true;
new_crtc_state->connectors_changed = true;
}
if (old_crtc_state->active != new_crtc_state->active) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active changed\n",
crtc->base.id, crtc->name);
new_crtc_state->active_changed = true;
}
if (new_crtc_state->enable != has_connectors) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled/connectors mismatch\n",
crtc->base.id, crtc->name);
return -EINVAL;
}
if (drm_dev_has_vblank(dev))
new_crtc_state->no_vblank = false;
else
new_crtc_state->no_vblank = true;
}
ret = handle_conflicting_encoders(state, false);
if (ret)
return ret;
for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
const struct drm_connector_helper_funcs *funcs = connector->helper_private;
WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
/*
* This only sets crtc->connectors_changed for routing changes,
* drivers must set crtc->connectors_changed themselves when
* connector properties need to be updated.
*/
ret = update_connector_routing(state, connector,
old_connector_state,
new_connector_state);
if (ret)
return ret;
if (old_connector_state->crtc) {
new_crtc_state = drm_atomic_get_new_crtc_state(state,
old_connector_state->crtc);
if (old_connector_state->link_status !=
new_connector_state->link_status)
new_crtc_state->connectors_changed = true;
if (old_connector_state->max_requested_bpc !=
new_connector_state->max_requested_bpc)
new_crtc_state->connectors_changed = true;
}
if (funcs->atomic_check)
ret = funcs->atomic_check(connector, state);
if (ret)
return ret;
connectors_mask |= BIT(i);
}
/*
* After all the routing has been prepared we need to add in any
* connector which is itself unchanged, but whose CRTC changes its
* configuration. This must be done before calling mode_fixup in case a
* crtc only changed its mode but has the same set of connectors.
*/
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
continue;
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] needs all connectors, enable: %c, active: %c\n",
crtc->base.id, crtc->name,
new_crtc_state->enable ? 'y' : 'n',
new_crtc_state->active ? 'y' : 'n');
ret = drm_atomic_add_affected_connectors(state, crtc);
if (ret != 0)
return ret;
ret = drm_atomic_add_affected_planes(state, crtc);
if (ret != 0)
return ret;
}
/*
* Iterate over all connectors again, to make sure atomic_check()
* has been called on them when a modeset is forced.
*/
for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
const struct drm_connector_helper_funcs *funcs = connector->helper_private;
if (connectors_mask & BIT(i))
continue;
if (funcs->atomic_check)
ret = funcs->atomic_check(connector, state);
if (ret)
return ret;
}
/*
* Iterate over all connectors again, and add all affected bridges to
* the state.
*/
for_each_oldnew_connector_in_state(state, connector,
old_connector_state,
new_connector_state, i) {
struct drm_encoder *encoder;
encoder = old_connector_state->best_encoder;
ret = drm_atomic_add_encoder_bridges(state, encoder);
if (ret)
return ret;
encoder = new_connector_state->best_encoder;
ret = drm_atomic_add_encoder_bridges(state, encoder);
if (ret)
return ret;
}
ret = mode_valid(state);
if (ret)
return ret;
return mode_fixup(state);
}
EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
/**
* drm_atomic_helper_check_plane_state() - Check plane state for validity
* @plane_state: plane state to check
* @crtc_state: CRTC state to check
* @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
* @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
* @can_position: is it legal to position the plane such that it
* doesn't cover the entire CRTC? This will generally
* only be false for primary planes.
* @can_update_disabled: can the plane be updated while the CRTC
* is disabled?
*
* Checks that a desired plane update is valid, and updates various
* bits of derived state (clipped coordinates etc.). Drivers that provide
* their own plane handling rather than helper-provided implementations may
* still wish to call this function to avoid duplication of error checking
* code.
*
* RETURNS:
* Zero if update appears valid, error code on failure
*/
int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
const struct drm_crtc_state *crtc_state,
int min_scale,
int max_scale,
bool can_position,
bool can_update_disabled)
{
struct drm_framebuffer *fb = plane_state->fb;
struct drm_rect *src = &plane_state->src;
struct drm_rect *dst = &plane_state->dst;
unsigned int rotation = plane_state->rotation;
struct drm_rect clip = {};
int hscale, vscale;
WARN_ON(plane_state->crtc && plane_state->crtc != crtc_state->crtc);
*src = drm_plane_state_src(plane_state);
*dst = drm_plane_state_dest(plane_state);
if (!fb) {
plane_state->visible = false;
return 0;
}
/* crtc should only be NULL when disabling (i.e., !fb) */
if (WARN_ON(!plane_state->crtc)) {
plane_state->visible = false;
return 0;
}
if (!crtc_state->enable && !can_update_disabled) {
DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n");
return -EINVAL;
}
drm_rect_rotate(src, fb->width << 16, fb->height << 16, rotation);
/* Check scaling */
hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
if (hscale < 0 || vscale < 0) {
DRM_DEBUG_KMS("Invalid scaling of plane\n");
drm_rect_debug_print("src: ", &plane_state->src, true);
drm_rect_debug_print("dst: ", &plane_state->dst, false);
return -ERANGE;
}
if (crtc_state->enable)
drm_mode_get_hv_timing(&crtc_state->mode, &clip.x2, &clip.y2);
plane_state->visible = drm_rect_clip_scaled(src, dst, &clip);
drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16, rotation);
if (!plane_state->visible)
/*
* Plane isn't visible; some drivers can handle this
* so we just return success here. Drivers that can't
* (including those that use the primary plane helper's
* update function) will return an error from their
* update_plane handler.
*/
return 0;
if (!can_position && !drm_rect_equals(dst, &clip)) {
DRM_DEBUG_KMS("Plane must cover entire CRTC\n");
drm_rect_debug_print("dst: ", dst, false);
drm_rect_debug_print("clip: ", &clip, false);
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_helper_check_plane_state);
/**
* drm_atomic_helper_check_planes - validate state object for planes changes
* @dev: DRM device
* @state: the driver state object
*
* Check the state object to see if the requested state is physically possible.
* This does all the plane update related checks using by calling into the
* &drm_crtc_helper_funcs.atomic_check and &drm_plane_helper_funcs.atomic_check
* hooks provided by the driver.
*
* It also sets &drm_crtc_state.planes_changed to indicate that a CRTC has
* updated planes.
*
* RETURNS:
* Zero for success or -errno
*/
int
drm_atomic_helper_check_planes(struct drm_device *dev,
struct drm_atomic_state *state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *new_crtc_state;
struct drm_plane *plane;
struct drm_plane_state *new_plane_state, *old_plane_state;
int i, ret = 0;
for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
const struct drm_plane_helper_funcs *funcs;
WARN_ON(!drm_modeset_is_locked(&plane->mutex));
funcs = plane->helper_private;
drm_atomic_helper_plane_changed(state, old_plane_state, new_plane_state, plane);
drm_atomic_helper_check_plane_damage(state, new_plane_state);
if (!funcs || !funcs->atomic_check)
continue;
ret = funcs->atomic_check(plane, new_plane_state);
if (ret) {
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic driver check failed\n",
plane->base.id, plane->name);
return ret;
}
}
for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
const struct drm_crtc_helper_funcs *funcs;
funcs = crtc->helper_private;
if (!funcs || !funcs->atomic_check)
continue;
ret = funcs->atomic_check(crtc, state);
if (ret) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic driver check failed\n",
crtc->base.id, crtc->name);
return ret;
}
}
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_check_planes);
/**
* drm_atomic_helper_check - validate state object
* @dev: DRM device
* @state: the driver state object
*
* Check the state object to see if the requested state is physically possible.
* Only CRTCs and planes have check callbacks, so for any additional (global)
* checking that a driver needs it can simply wrap that around this function.
* Drivers without such needs can directly use this as their
* &drm_mode_config_funcs.atomic_check callback.
*
* This just wraps the two parts of the state checking for planes and modeset
* state in the default order: First it calls drm_atomic_helper_check_modeset()
* and then drm_atomic_helper_check_planes(). The assumption is that the
* @drm_plane_helper_funcs.atomic_check and @drm_crtc_helper_funcs.atomic_check
* functions depend upon an updated adjusted_mode.clock to e.g. properly compute
* watermarks.
*
* Note that zpos normalization will add all enable planes to the state which
* might not desired for some drivers.
* For example enable/disable of a cursor plane which have fixed zpos value
* would trigger all other enabled planes to be forced to the state change.
*
* RETURNS:
* Zero for success or -errno
*/
int drm_atomic_helper_check(struct drm_device *dev,
struct drm_atomic_state *state)
{
int ret;
ret = drm_atomic_helper_check_modeset(dev, state);
if (ret)
return ret;
if (dev->mode_config.normalize_zpos) {
ret = drm_atomic_normalize_zpos(dev, state);
if (ret)
return ret;
}
ret = drm_atomic_helper_check_planes(dev, state);
if (ret)
return ret;
if (state->legacy_cursor_update)
state->async_update = !drm_atomic_helper_async_check(dev, state);
drm_self_refresh_helper_alter_state(state);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_check);
static bool
crtc_needs_disable(struct drm_crtc_state *old_state,
struct drm_crtc_state *new_state)
{
/*
* No new_state means the CRTC is off, so the only criteria is whether
* it's currently active or in self refresh mode.
*/
if (!new_state)
return drm_atomic_crtc_effectively_active(old_state);
/*
* We need to run through the crtc_funcs->disable() function if the CRTC
* is currently on, if it's transitioning to self refresh mode, or if
* it's in self refresh mode and needs to be fully disabled.
*/
return old_state->active ||
(old_state->self_refresh_active && !new_state->enable) ||
new_state->self_refresh_active;
}
static void
disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
{
struct drm_connector *connector;
struct drm_connector_state *old_conn_state, *new_conn_state;
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
int i;
for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
const struct drm_encoder_helper_funcs *funcs;
struct drm_encoder *encoder;
struct drm_bridge *bridge;
/* Shut down everything that's in the changeset and currently
* still on. So need to check the old, saved state. */
if (!old_conn_state->crtc)
continue;
old_crtc_state = drm_atomic_get_old_crtc_state(old_state, old_conn_state->crtc);
if (new_conn_state->crtc)
new_crtc_state = drm_atomic_get_new_crtc_state(
old_state,
new_conn_state->crtc);
else
new_crtc_state = NULL;
if (!crtc_needs_disable(old_crtc_state, new_crtc_state) ||
!drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state))
continue;
encoder = old_conn_state->best_encoder;
/* We shouldn't get this far if we didn't previously have
* an encoder.. but WARN_ON() rather than explode.
*/
if (WARN_ON(!encoder))
continue;
funcs = encoder->helper_private;
DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n",
encoder->base.id, encoder->name);
/*
* Each encoder has at most one connector (since we always steal
* it away), so we won't call disable hooks twice.
*/
bridge = drm_bridge_chain_get_first_bridge(encoder);
drm_atomic_bridge_chain_disable(bridge, old_state);
/* Right function depends upon target state. */
if (funcs) {
if (funcs->atomic_disable)
funcs->atomic_disable(encoder, old_state);
else if (new_conn_state->crtc && funcs->prepare)
funcs->prepare(encoder);
else if (funcs->disable)
funcs->disable(encoder);
else if (funcs->dpms)
funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
}
drm_atomic_bridge_chain_post_disable(bridge, old_state);
}
for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
const struct drm_crtc_helper_funcs *funcs;
int ret;
/* Shut down everything that needs a full modeset. */
if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
continue;
if (!crtc_needs_disable(old_crtc_state, new_crtc_state))
continue;
funcs = crtc->helper_private;
DRM_DEBUG_ATOMIC("disabling [CRTC:%d:%s]\n",
crtc->base.id, crtc->name);
/* Right function depends upon target state. */
if (new_crtc_state->enable && funcs->prepare)
funcs->prepare(crtc);
else if (funcs->atomic_disable)
funcs->atomic_disable(crtc, old_state);
else if (funcs->disable)
funcs->disable(crtc);
else if (funcs->dpms)
funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
if (!drm_dev_has_vblank(dev))
continue;
ret = drm_crtc_vblank_get(crtc);
WARN_ONCE(ret != -EINVAL, "driver forgot to call drm_crtc_vblank_off()\n");
if (ret == 0)
drm_crtc_vblank_put(crtc);
}
}
/**
* drm_atomic_helper_update_legacy_modeset_state - update legacy modeset state
* @dev: DRM device
* @old_state: atomic state object with old state structures
*
* This function updates all the various legacy modeset state pointers in
* connectors, encoders and CRTCs.
*
* Drivers can use this for building their own atomic commit if they don't have
* a pure helper-based modeset implementation.
*
* Since these updates are not synchronized with lockings, only code paths
* called from &drm_mode_config_helper_funcs.atomic_commit_tail can look at the
* legacy state filled out by this helper. Defacto this means this helper and
* the legacy state pointers are only really useful for transitioning an
* existing driver to the atomic world.
*/
void
drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
struct drm_atomic_state *old_state)
{
struct drm_connector *connector;
struct drm_connector_state *old_conn_state, *new_conn_state;
struct drm_crtc *crtc;
struct drm_crtc_state *new_crtc_state;
int i;
/* clear out existing links and update dpms */
for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
if (connector->encoder) {
WARN_ON(!connector->encoder->crtc);
connector->encoder->crtc = NULL;
connector->encoder = NULL;
}
crtc = new_conn_state->crtc;
if ((!crtc && old_conn_state->crtc) ||
(crtc && drm_atomic_crtc_needs_modeset(crtc->state))) {
int mode = DRM_MODE_DPMS_OFF;
if (crtc && crtc->state->active)
mode = DRM_MODE_DPMS_ON;
connector->dpms = mode;
}
}
/* set new links */
for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
if (!new_conn_state->crtc)
continue;
if (WARN_ON(!new_conn_state->best_encoder))
continue;
connector->encoder = new_conn_state->best_encoder;
connector->encoder->crtc = new_conn_state->crtc;
}
/* set legacy state in the crtc structure */
for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
struct drm_plane *primary = crtc->primary;
struct drm_plane_state *new_plane_state;
crtc->mode = new_crtc_state->mode;
crtc->enabled = new_crtc_state->enable;
new_plane_state =
drm_atomic_get_new_plane_state(old_state, primary);
if (new_plane_state && new_plane_state->crtc == crtc) {
crtc->x = new_plane_state->src_x >> 16;
crtc->y = new_plane_state->src_y >> 16;
}
}
}
EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state);
/**
* drm_atomic_helper_calc_timestamping_constants - update vblank timestamping constants
* @state: atomic state object
*
* Updates the timestamping constants used for precise vblank timestamps
* by calling drm_calc_timestamping_constants() for all enabled crtcs in @state.
*/
void drm_atomic_helper_calc_timestamping_constants(struct drm_atomic_state *state)
{
struct drm_crtc_state *new_crtc_state;
struct drm_crtc *crtc;
int i;
for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
if (new_crtc_state->enable)
drm_calc_timestamping_constants(crtc,
&new_crtc_state->adjusted_mode);
}
}
EXPORT_SYMBOL(drm_atomic_helper_calc_timestamping_constants);
static void
crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *new_crtc_state;
struct drm_connector *connector;
struct drm_connector_state *new_conn_state;
int i;
for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
const struct drm_crtc_helper_funcs *funcs;
if (!new_crtc_state->mode_changed)
continue;
funcs = crtc->helper_private;
if (new_crtc_state->enable && funcs->mode_set_nofb) {
DRM_DEBUG_ATOMIC("modeset on [CRTC:%d:%s]\n",
crtc->base.id, crtc->name);
funcs->mode_set_nofb(crtc);
}
}
for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
const struct drm_encoder_helper_funcs *funcs;
struct drm_encoder *encoder;
struct drm_display_mode *mode, *adjusted_mode;
struct drm_bridge *bridge;
if (!new_conn_state->best_encoder)
continue;
encoder = new_conn_state->best_encoder;
funcs = encoder->helper_private;
new_crtc_state = new_conn_state->crtc->state;
mode = &new_crtc_state->mode;
adjusted_mode = &new_crtc_state->adjusted_mode;
if (!new_crtc_state->mode_changed)
continue;
DRM_DEBUG_ATOMIC("modeset on [ENCODER:%d:%s]\n",
encoder->base.id, encoder->name);
/*
* Each encoder has at most one connector (since we always steal
* it away), so we won't call mode_set hooks twice.
*/
if (funcs && funcs->atomic_mode_set) {
funcs->atomic_mode_set(encoder, new_crtc_state,
new_conn_state);
} else if (funcs && funcs->mode_set) {
funcs->mode_set(encoder, mode, adjusted_mode);
}
bridge = drm_bridge_chain_get_first_bridge(encoder);
drm_bridge_chain_mode_set(bridge, mode, adjusted_mode);
}
}
/**
* drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs
* @dev: DRM device
* @old_state: atomic state object with old state structures
*
* This function shuts down all the outputs that need to be shut down and
* prepares them (if required) with the new mode.
*
* For compatibility with legacy CRTC helpers this should be called before
* drm_atomic_helper_commit_planes(), which is what the default commit function
* does. But drivers with different needs can group the modeset commits together
* and do the plane commits at the end. This is useful for drivers doing runtime
* PM since planes updates then only happen when the CRTC is actually enabled.
*/
void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
struct drm_atomic_state *old_state)
{
disable_outputs(dev, old_state);
drm_atomic_helper_update_legacy_modeset_state(dev, old_state);
drm_atomic_helper_calc_timestamping_constants(old_state);
crtc_set_mode(dev, old_state);
}
EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
static void drm_atomic_helper_commit_writebacks(struct drm_device *dev,
struct drm_atomic_state *old_state)
{
struct drm_connector *connector;
struct drm_connector_state *new_conn_state;
int i;
for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
const struct drm_connector_helper_funcs *funcs;
funcs = connector->helper_private;
if (!funcs->atomic_commit)
continue;
if (new_conn_state->writeback_job && new_conn_state->writeback_job->fb) {
WARN_ON(connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK);
funcs->atomic_commit(connector, old_state);
}
}
}
/**
* drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs
* @dev: DRM device
* @old_state: atomic state object with old state structures
*
* This function enables all the outputs with the new configuration which had to
* be turned off for the update.
*
* For compatibility with legacy CRTC helpers this should be called after
* drm_atomic_helper_commit_planes(), which is what the default commit function
* does. But drivers with different needs can group the modeset commits together
* and do the plane commits at the end. This is useful for drivers doing runtime
* PM since planes updates then only happen when the CRTC is actually enabled.
*/
void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
struct drm_atomic_state *old_state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state;
struct drm_crtc_state *new_crtc_state;
struct drm_connector *connector;
struct drm_connector_state *new_conn_state;
int i;
for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
const struct drm_crtc_helper_funcs *funcs;
/* Need to filter out CRTCs where only planes change. */
if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
continue;
if (!new_crtc_state->active)
continue;
funcs = crtc->helper_private;
if (new_crtc_state->enable) {
DRM_DEBUG_ATOMIC("enabling [CRTC:%d:%s]\n",
crtc->base.id, crtc->name);
if (funcs->atomic_enable)
funcs->atomic_enable(crtc, old_state);
else if (funcs->commit)
funcs->commit(crtc);
}
}
for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
const struct drm_encoder_helper_funcs *funcs;
struct drm_encoder *encoder;
struct drm_bridge *bridge;
if (!new_conn_state->best_encoder)
continue;
if (!new_conn_state->crtc->state->active ||
!drm_atomic_crtc_needs_modeset(new_conn_state->crtc->state))
continue;
encoder = new_conn_state->best_encoder;
funcs = encoder->helper_private;
DRM_DEBUG_ATOMIC("enabling [ENCODER:%d:%s]\n",
encoder->base.id, encoder->name);
/*
* Each encoder has at most one connector (since we always steal
* it away), so we won't call enable hooks twice.
*/
bridge = drm_bridge_chain_get_first_bridge(encoder);
drm_atomic_bridge_chain_pre_enable(bridge, old_state);
if (funcs) {
if (funcs->atomic_enable)
funcs->atomic_enable(encoder, old_state);
else if (funcs->enable)
funcs->enable(encoder);
else if (funcs->commit)
funcs->commit(encoder);
}
drm_atomic_bridge_chain_enable(bridge, old_state);
}
drm_atomic_helper_commit_writebacks(dev, old_state);
}
EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
/**
* drm_atomic_helper_wait_for_fences - wait for fences stashed in plane state
* @dev: DRM device
* @state: atomic state object with old state structures
* @pre_swap: If true, do an interruptible wait, and @state is the new state.
* Otherwise @state is the old state.
*
* For implicit sync, driver should fish the exclusive fence out from the
* incoming fb's and stash it in the drm_plane_state. This is called after
* drm_atomic_helper_swap_state() so it uses the current plane state (and
* just uses the atomic state to find the changed planes)
*
* Note that @pre_swap is needed since the point where we block for fences moves
* around depending upon whether an atomic commit is blocking or
* non-blocking. For non-blocking commit all waiting needs to happen after
* drm_atomic_helper_swap_state() is called, but for blocking commits we want
* to wait **before** we do anything that can't be easily rolled back. That is
* before we call drm_atomic_helper_swap_state().
*
* Returns zero if success or < 0 if dma_fence_wait() fails.
*/
int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
struct drm_atomic_state *state,
bool pre_swap)
{
struct drm_plane *plane;
struct drm_plane_state *new_plane_state;
int i, ret;
for_each_new_plane_in_state(state, plane, new_plane_state, i) {
if (!new_plane_state->fence)
continue;
WARN_ON(!new_plane_state->fb);
/*
* If waiting for fences pre-swap (ie: nonblock), userspace can
* still interrupt the operation. Instead of blocking until the
* timer expires, make the wait interruptible.
*/
ret = dma_fence_wait(new_plane_state->fence, pre_swap);
if (ret)
return ret;
dma_fence_put(new_plane_state->fence);
new_plane_state->fence = NULL;
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_helper_wait_for_fences);
/**
* drm_atomic_helper_wait_for_vblanks - wait for vblank on CRTCs
* @dev: DRM device
* @old_state: atomic state object with old state structures
*
* Helper to, after atomic commit, wait for vblanks on all affected
* CRTCs (ie. before cleaning up old framebuffers using
* drm_atomic_helper_cleanup_planes()). It will only wait on CRTCs where the
* framebuffers have actually changed to optimize for the legacy cursor and
* plane update use-case.
*
* Drivers using the nonblocking commit tracking support initialized by calling
* drm_atomic_helper_setup_commit() should look at
* drm_atomic_helper_wait_for_flip_done() as an alternative.
*/
void
drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
struct drm_atomic_state *old_state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
int i, ret;
unsigned crtc_mask = 0;
/*
* Legacy cursor ioctls are completely unsynced, and userspace
* relies on that (by doing tons of cursor updates).
*/
if (old_state->legacy_cursor_update)
return;
for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
if (!new_crtc_state->active)
continue;
ret = drm_crtc_vblank_get(crtc);
if (ret != 0)
continue;
crtc_mask |= drm_crtc_mask(crtc);
old_state->crtcs[i].last_vblank_count = drm_crtc_vblank_count(crtc);
}
for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
if (!(crtc_mask & drm_crtc_mask(crtc)))
continue;
ret = wait_event_timeout(dev->vblank[i].queue,
old_state->crtcs[i].last_vblank_count !=
drm_crtc_vblank_count(crtc),
msecs_to_jiffies(100));
WARN(!ret, "[CRTC:%d:%s] vblank wait timed out\n",
crtc->base.id, crtc->name);
drm_crtc_vblank_put(crtc);
}
}
EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
/**
* drm_atomic_helper_wait_for_flip_done - wait for all page flips to be done
* @dev: DRM device
* @old_state: atomic state object with old state structures
*
* Helper to, after atomic commit, wait for page flips on all affected
* crtcs (ie. before cleaning up old framebuffers using
* drm_atomic_helper_cleanup_planes()). Compared to
* drm_atomic_helper_wait_for_vblanks() this waits for the completion on all
* CRTCs, assuming that cursors-only updates are signalling their completion
* immediately (or using a different path).
*
* This requires that drivers use the nonblocking commit tracking support
* initialized using drm_atomic_helper_setup_commit().
*/
void drm_atomic_helper_wait_for_flip_done(struct drm_device *dev,
struct drm_atomic_state *old_state)
{
struct drm_crtc *crtc;
int i;
for (i = 0; i < dev->mode_config.num_crtc; i++) {
struct drm_crtc_commit *commit = old_state->crtcs[i].commit;
int ret;
crtc = old_state->crtcs[i].ptr;
if (!crtc || !commit)
continue;
ret = wait_for_completion_timeout(&commit->flip_done, 10 * HZ);
if (ret == 0)
DRM_ERROR("[CRTC:%d:%s] flip_done timed out\n",
crtc->base.id, crtc->name);
}
if (old_state->fake_commit)
complete_all(&old_state->fake_commit->flip_done);
}
EXPORT_SYMBOL(drm_atomic_helper_wait_for_flip_done);
/**
* drm_atomic_helper_commit_tail - commit atomic update to hardware
* @old_state: atomic state object with old state structures
*
* This is the default implementation for the
* &drm_mode_config_helper_funcs.atomic_commit_tail hook, for drivers
* that do not support runtime_pm or do not need the CRTC to be
* enabled to perform a commit. Otherwise, see
* drm_atomic_helper_commit_tail_rpm().
*
* Note that the default ordering of how the various stages are called is to
* match the legacy modeset helper library closest.
*/
void drm_atomic_helper_commit_tail(struct drm_atomic_state *old_state)
{
struct drm_device *dev = old_state->dev;
drm_atomic_helper_commit_modeset_disables(dev, old_state);
drm_atomic_helper_commit_planes(dev, old_state, 0);
drm_atomic_helper_commit_modeset_enables(dev, old_state);
drm_atomic_helper_fake_vblank(old_state);
drm_atomic_helper_commit_hw_done(old_state);
drm_atomic_helper_wait_for_vblanks(dev, old_state);
drm_atomic_helper_cleanup_planes(dev, old_state);
}
EXPORT_SYMBOL(drm_atomic_helper_commit_tail);
/**
* drm_atomic_helper_commit_tail_rpm - commit atomic update to hardware
* @old_state: new modeset state to be committed
*
* This is an alternative implementation for the
* &drm_mode_config_helper_funcs.atomic_commit_tail hook, for drivers
* that support runtime_pm or need the CRTC to be enabled to perform a
* commit. Otherwise, one should use the default implementation
* drm_atomic_helper_commit_tail().
*/
void drm_atomic_helper_commit_tail_rpm(struct drm_atomic_state *old_state)
{
struct drm_device *dev = old_state->dev;
drm_atomic_helper_commit_modeset_disables(dev, old_state);
drm_atomic_helper_commit_modeset_enables(dev, old_state);
drm_atomic_helper_commit_planes(dev, old_state,
DRM_PLANE_COMMIT_ACTIVE_ONLY);
drm_atomic_helper_fake_vblank(old_state);
drm_atomic_helper_commit_hw_done(old_state);
drm_atomic_helper_wait_for_vblanks(dev, old_state);
drm_atomic_helper_cleanup_planes(dev, old_state);
}
EXPORT_SYMBOL(drm_atomic_helper_commit_tail_rpm);
static void commit_tail(struct drm_atomic_state *old_state)
{
struct drm_device *dev = old_state->dev;
const struct drm_mode_config_helper_funcs *funcs;
struct drm_crtc_state *new_crtc_state;
struct drm_crtc *crtc;
ktime_t start;
s64 commit_time_ms;
unsigned int i, new_self_refresh_mask = 0;
funcs = dev->mode_config.helper_private;
/*
* We're measuring the _entire_ commit, so the time will vary depending
* on how many fences and objects are involved. For the purposes of self
* refresh, this is desirable since it'll give us an idea of how
* congested things are. This will inform our decision on how often we
* should enter self refresh after idle.
*
* These times will be averaged out in the self refresh helpers to avoid
* overreacting over one outlier frame
*/
start = ktime_get();
drm_atomic_helper_wait_for_fences(dev, old_state, false);
drm_atomic_helper_wait_for_dependencies(old_state);
/*
* We cannot safely access new_crtc_state after
* drm_atomic_helper_commit_hw_done() so figure out which crtc's have
* self-refresh active beforehand:
*/
for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i)
if (new_crtc_state->self_refresh_active)
new_self_refresh_mask |= BIT(i);
if (funcs && funcs->atomic_commit_tail)
funcs->atomic_commit_tail(old_state);
else
drm_atomic_helper_commit_tail(old_state);
commit_time_ms = ktime_ms_delta(ktime_get(), start);
if (commit_time_ms > 0)
drm_self_refresh_helper_update_avg_times(old_state,
(unsigned long)commit_time_ms,
new_self_refresh_mask);
drm_atomic_helper_commit_cleanup_done(old_state);
drm_atomic_state_put(old_state);
}
static void commit_work(struct work_struct *work)
{
struct drm_atomic_state *state = container_of(work,
struct drm_atomic_state,
commit_work);
commit_tail(state);
}
/**
* drm_atomic_helper_async_check - check if state can be commited asynchronously
* @dev: DRM device
* @state: the driver state object
*
* This helper will check if it is possible to commit the state asynchronously.
* Async commits are not supposed to swap the states like normal sync commits
* but just do in-place changes on the current state.
*
* It will return 0 if the commit can happen in an asynchronous fashion or error
* if not. Note that error just mean it can't be commited asynchronously, if it
* fails the commit should be treated like a normal synchronous commit.
*/
int drm_atomic_helper_async_check(struct drm_device *dev,
struct drm_atomic_state *state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *crtc_state;
struct drm_plane *plane = NULL;
struct drm_plane_state *old_plane_state = NULL;
struct drm_plane_state *new_plane_state = NULL;
const struct drm_plane_helper_funcs *funcs;
int i, n_planes = 0;
for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
if (drm_atomic_crtc_needs_modeset(crtc_state))
return -EINVAL;
}
for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i)
n_planes++;
/* FIXME: we support only single plane updates for now */
if (n_planes != 1)
return -EINVAL;
if (!new_plane_state->crtc ||
old_plane_state->crtc != new_plane_state->crtc)
return -EINVAL;
funcs = plane->helper_private;
if (!funcs->atomic_async_update)
return -EINVAL;
if (new_plane_state->fence)
return -EINVAL;
/*
* Don't do an async update if there is an outstanding commit modifying
* the plane. This prevents our async update's changes from getting
* overridden by a previous synchronous update's state.
*/
if (old_plane_state->commit &&
!try_wait_for_completion(&old_plane_state->commit->hw_done)) {
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] inflight previous commit preventing async commit\n",
plane->base.id, plane->name);
return -EBUSY;
}
return funcs->atomic_async_check(plane, new_plane_state);
}
EXPORT_SYMBOL(drm_atomic_helper_async_check);
/**
* drm_atomic_helper_async_commit - commit state asynchronously
* @dev: DRM device
* @state: the driver state object
*
* This function commits a state asynchronously, i.e., not vblank
* synchronized. It should be used on a state only when
* drm_atomic_async_check() succeeds. Async commits are not supposed to swap
* the states like normal sync commits, but just do in-place changes on the
* current state.
*
* TODO: Implement full swap instead of doing in-place changes.
*/
void drm_atomic_helper_async_commit(struct drm_device *dev,
struct drm_atomic_state *state)
{
struct drm_plane *plane;
struct drm_plane_state *plane_state;
const struct drm_plane_helper_funcs *funcs;
int i;
for_each_new_plane_in_state(state, plane, plane_state, i) {
struct drm_framebuffer *new_fb = plane_state->fb;
struct drm_framebuffer *old_fb = plane->state->fb;
funcs = plane->helper_private;
funcs->atomic_async_update(plane, plane_state);
/*
* ->atomic_async_update() is supposed to update the
* plane->state in-place, make sure at least common
* properties have been properly updated.
*/
WARN_ON_ONCE(plane->state->fb != new_fb);
WARN_ON_ONCE(plane->state->crtc_x != plane_state->crtc_x);
WARN_ON_ONCE(plane->state->crtc_y != plane_state->crtc_y);
WARN_ON_ONCE(plane->state->src_x != plane_state->src_x);
WARN_ON_ONCE(plane->state->src_y != plane_state->src_y);
/*
* Make sure the FBs have been swapped so that cleanups in the
* new_state performs a cleanup in the old FB.
*/
WARN_ON_ONCE(plane_state->fb != old_fb);
}
}
EXPORT_SYMBOL(drm_atomic_helper_async_commit);
/**
* drm_atomic_helper_commit - commit validated state object
* @dev: DRM device
* @state: the driver state object
* @nonblock: whether nonblocking behavior is requested.
*
* This function commits a with drm_atomic_helper_check() pre-validated state
* object. This can still fail when e.g. the framebuffer reservation fails. This
* function implements nonblocking commits, using
* drm_atomic_helper_setup_commit() and related functions.
*
* Committing the actual hardware state is done through the
* &drm_mode_config_helper_funcs.atomic_commit_tail callback, or its default
* implementation drm_atomic_helper_commit_tail().
*
* RETURNS:
* Zero for success or -errno.
*/
int drm_atomic_helper_commit(struct drm_device *dev,
struct drm_atomic_state *state,
bool nonblock)
{
int ret;
if (state->async_update) {
ret = drm_atomic_helper_prepare_planes(dev, state);
if (ret)
return ret;
drm_atomic_helper_async_commit(dev, state);
drm_atomic_helper_cleanup_planes(dev, state);
return 0;
}
ret = drm_atomic_helper_setup_commit(state, nonblock);
if (ret)
return ret;
INIT_WORK(&state->commit_work, commit_work);
ret = drm_atomic_helper_prepare_planes(dev, state);
if (ret)
return ret;
if (!nonblock) {
ret = drm_atomic_helper_wait_for_fences(dev, state, true);
if (ret)
goto err;
}
/*
* This is the point of no return - everything below never fails except
* when the hw goes bonghits. Which means we can commit the new state on
* the software side now.
*/
ret = drm_atomic_helper_swap_state(state, true);
if (ret)
goto err;
/*
* Everything below can be run asynchronously without the need to grab
* any modeset locks at all under one condition: It must be guaranteed
* that the asynchronous work has either been cancelled (if the driver
* supports it, which at least requires that the framebuffers get
* cleaned up with drm_atomic_helper_cleanup_planes()) or completed
* before the new state gets committed on the software side with
* drm_atomic_helper_swap_state().
*
* This scheme allows new atomic state updates to be prepared and
* checked in parallel to the asynchronous completion of the previous
* update. Which is important since compositors need to figure out the
* composition of the next frame right after having submitted the
* current layout.
*
* NOTE: Commit work has multiple phases, first hardware commit, then
* cleanup. We want them to overlap, hence need system_unbound_wq to
* make sure work items don't artificially stall on each another.
*/
drm_atomic_state_get(state);
if (nonblock)
queue_work(system_unbound_wq, &state->commit_work);
else
commit_tail(state);
return 0;
err:
drm_atomic_helper_cleanup_planes(dev, state);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_commit);
/**
* DOC: implementing nonblocking commit
*
* Nonblocking atomic commits should use struct &drm_crtc_commit to sequence
* different operations against each another. Locks, especially struct
* &drm_modeset_lock, should not be held in worker threads or any other
* asynchronous context used to commit the hardware state.
*
* drm_atomic_helper_commit() implements the recommended sequence for
* nonblocking commits, using drm_atomic_helper_setup_commit() internally:
*
* 1. Run drm_atomic_helper_prepare_planes(). Since this can fail and we
* need to propagate out of memory/VRAM errors to userspace, it must be called
* synchronously.
*
* 2. Synchronize with any outstanding nonblocking commit worker threads which
* might be affected by the new state update. This is handled by
* drm_atomic_helper_setup_commit().
*
* Asynchronous workers need to have sufficient parallelism to be able to run
* different atomic commits on different CRTCs in parallel. The simplest way to
* achieve this is by running them on the &system_unbound_wq work queue. Note
* that drivers are not required to split up atomic commits and run an
* individual commit in parallel - userspace is supposed to do that if it cares.
* But it might be beneficial to do that for modesets, since those necessarily
* must be done as one global operation, and enabling or disabling a CRTC can
* take a long time. But even that is not required.
*
* IMPORTANT: A &drm_atomic_state update for multiple CRTCs is sequenced
* against all CRTCs therein. Therefore for atomic state updates which only flip
* planes the driver must not get the struct &drm_crtc_state of unrelated CRTCs
* in its atomic check code: This would prevent committing of atomic updates to
* multiple CRTCs in parallel. In general, adding additional state structures
* should be avoided as much as possible, because this reduces parallelism in
* (nonblocking) commits, both due to locking and due to commit sequencing
* requirements.
*
* 3. The software state is updated synchronously with
* drm_atomic_helper_swap_state(). Doing this under the protection of all modeset
* locks means concurrent callers never see inconsistent state. Note that commit
* workers do not hold any locks; their access is only coordinated through
* ordering. If workers would access state only through the pointers in the
* free-standing state objects (currently not the case for any driver) then even
* multiple pending commits could be in-flight at the same time.
*
* 4. Schedule a work item to do all subsequent steps, using the split-out
* commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
* then cleaning up the framebuffers after the old framebuffer is no longer
* being displayed. The scheduled work should synchronize against other workers
* using the &drm_crtc_commit infrastructure as needed. See
* drm_atomic_helper_setup_commit() for more details.
*/
static int stall_checks(struct drm_crtc *crtc, bool nonblock)
{
struct drm_crtc_commit *commit, *stall_commit = NULL;
bool completed = true;
int i;
long ret = 0;
spin_lock(&crtc->commit_lock);
i = 0;
list_for_each_entry(commit, &crtc->commit_list, commit_entry) {
if (i == 0) {
completed = try_wait_for_completion(&commit->flip_done);
/* Userspace is not allowed to get ahead of the previous
* commit with nonblocking ones. */
if (!completed && nonblock) {
spin_unlock(&crtc->commit_lock);
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] busy with a previous commit\n",
crtc->base.id, crtc->name);
return -EBUSY;
}
} else if (i == 1) {
stall_commit = drm_crtc_commit_get(commit);
break;
}
i++;
}
spin_unlock(&crtc->commit_lock);
if (!stall_commit)
return 0;
/* We don't want to let commits get ahead of cleanup work too much,
* stalling on 2nd previous commit means triple-buffer won't ever stall.
*/
ret = wait_for_completion_interruptible_timeout(&stall_commit->cleanup_done,
10*HZ);
if (ret == 0)
DRM_ERROR("[CRTC:%d:%s] cleanup_done timed out\n",
crtc->base.id, crtc->name);
drm_crtc_commit_put(stall_commit);
return ret < 0 ? ret : 0;
}
static void release_crtc_commit(struct completion *completion)
{
struct drm_crtc_commit *commit = container_of(completion,
typeof(*commit),
flip_done);
drm_crtc_commit_put(commit);
}
static void init_commit(struct drm_crtc_commit *commit, struct drm_crtc *crtc)
{
init_completion(&commit->flip_done);
init_completion(&commit->hw_done);
init_completion(&commit->cleanup_done);
INIT_LIST_HEAD(&commit->commit_entry);
kref_init(&commit->ref);
commit->crtc = crtc;
}
static struct drm_crtc_commit *
crtc_or_fake_commit(struct drm_atomic_state *state, struct drm_crtc *crtc)
{
if (crtc) {
struct drm_crtc_state *new_crtc_state;
new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
return new_crtc_state->commit;
}
if (!state->fake_commit) {
state->fake_commit = kzalloc(sizeof(*state->fake_commit), GFP_KERNEL);
if (!state->fake_commit)
return NULL;
init_commit(state->fake_commit, NULL);
}
return state->fake_commit;
}
/**
* drm_atomic_helper_setup_commit - setup possibly nonblocking commit
* @state: new modeset state to be committed
* @nonblock: whether nonblocking behavior is requested.
*
* This function prepares @state to be used by the atomic helper's support for
* nonblocking commits. Drivers using the nonblocking commit infrastructure
* should always call this function from their
* &drm_mode_config_funcs.atomic_commit hook.
*
* To be able to use this support drivers need to use a few more helper
* functions. drm_atomic_helper_wait_for_dependencies() must be called before
* actually committing the hardware state, and for nonblocking commits this call
* must be placed in the async worker. See also drm_atomic_helper_swap_state()
* and its stall parameter, for when a driver's commit hooks look at the
* &drm_crtc.state, &drm_plane.state or &drm_connector.state pointer directly.
*
* Completion of the hardware commit step must be signalled using
* drm_atomic_helper_commit_hw_done(). After this step the driver is not allowed
* to read or change any permanent software or hardware modeset state. The only
* exception is state protected by other means than &drm_modeset_lock locks.
* Only the free standing @state with pointers to the old state structures can
* be inspected, e.g. to clean up old buffers using
* drm_atomic_helper_cleanup_planes().
*
* At the very end, before cleaning up @state drivers must call
* drm_atomic_helper_commit_cleanup_done().
*
* This is all implemented by in drm_atomic_helper_commit(), giving drivers a
* complete and easy-to-use default implementation of the atomic_commit() hook.
*
* The tracking of asynchronously executed and still pending commits is done
* using the core structure &drm_crtc_commit.
*
* By default there's no need to clean up resources allocated by this function
* explicitly: drm_atomic_state_default_clear() will take care of that
* automatically.
*
* Returns:
*
* 0 on success. -EBUSY when userspace schedules nonblocking commits too fast,
* -ENOMEM on allocation failures and -EINTR when a signal is pending.
*/
int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
bool nonblock)
{
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
struct drm_connector *conn;
struct drm_connector_state *old_conn_state, *new_conn_state;
struct drm_plane *plane;
struct drm_plane_state *old_plane_state, *new_plane_state;
struct drm_crtc_commit *commit;
int i, ret;
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
commit = kzalloc(sizeof(*commit), GFP_KERNEL);
if (!commit)
return -ENOMEM;
init_commit(commit, crtc);
new_crtc_state->commit = commit;
ret = stall_checks(crtc, nonblock);
if (ret)
return ret;
/* Drivers only send out events when at least either current or
* new CRTC state is active. Complete right away if everything
* stays off. */
if (!old_crtc_state->active && !new_crtc_state->active) {
complete_all(&commit->flip_done);
continue;
}
/* Legacy cursor updates are fully unsynced. */
if (state->legacy_cursor_update) {
complete_all(&commit->flip_done);
continue;
}
if (!new_crtc_state->event) {
commit->event = kzalloc(sizeof(*commit->event),
GFP_KERNEL);
if (!commit->event)
return -ENOMEM;
new_crtc_state->event = commit->event;
}
new_crtc_state->event->base.completion = &commit->flip_done;
new_crtc_state->event->base.completion_release = release_crtc_commit;
drm_crtc_commit_get(commit);
commit->abort_completion = true;
state->crtcs[i].commit = commit;
drm_crtc_commit_get(commit);
}
for_each_oldnew_connector_in_state(state, conn, old_conn_state, new_conn_state, i) {
/* Userspace is not allowed to get ahead of the previous
* commit with nonblocking ones. */
if (nonblock && old_conn_state->commit &&
!try_wait_for_completion(&old_conn_state->commit->flip_done)) {
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] busy with a previous commit\n",
conn->base.id, conn->name);
return -EBUSY;
}
/* Always track connectors explicitly for e.g. link retraining. */
commit = crtc_or_fake_commit(state, new_conn_state->crtc ?: old_conn_state->crtc);
if (!commit)
return -ENOMEM;
new_conn_state->commit = drm_crtc_commit_get(commit);
}
for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
/* Userspace is not allowed to get ahead of the previous
* commit with nonblocking ones. */
if (nonblock && old_plane_state->commit &&
!try_wait_for_completion(&old_plane_state->commit->flip_done)) {
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] busy with a previous commit\n",
plane->base.id, plane->name);
return -EBUSY;
}
/* Always track planes explicitly for async pageflip support. */
commit = crtc_or_fake_commit(state, new_plane_state->crtc ?: old_plane_state->crtc);
if (!commit)
return -ENOMEM;
new_plane_state->commit = drm_crtc_commit_get(commit);
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_helper_setup_commit);
/**
* drm_atomic_helper_wait_for_dependencies - wait for required preceeding commits
* @old_state: atomic state object with old state structures
*
* This function waits for all preceeding commits that touch the same CRTC as
* @old_state to both be committed to the hardware (as signalled by
* drm_atomic_helper_commit_hw_done()) and executed by the hardware (as signalled
* by calling drm_crtc_send_vblank_event() on the &drm_crtc_state.event).
*
* This is part of the atomic helper support for nonblocking commits, see
* drm_atomic_helper_setup_commit() for an overview.
*/
void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *old_state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state;
struct drm_plane *plane;
struct drm_plane_state *old_plane_state;
struct drm_connector *conn;
struct drm_connector_state *old_conn_state;
struct drm_crtc_commit *commit;
int i;
long ret;
for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
commit = old_crtc_state->commit;
if (!commit)
continue;
ret = wait_for_completion_timeout(&commit->hw_done,
10*HZ);
if (ret == 0)
DRM_ERROR("[CRTC:%d:%s] hw_done timed out\n",
crtc->base.id, crtc->name);
/* Currently no support for overwriting flips, hence
* stall for previous one to execute completely. */
ret = wait_for_completion_timeout(&commit->flip_done,
10*HZ);
if (ret == 0)
DRM_ERROR("[CRTC:%d:%s] flip_done timed out\n",
crtc->base.id, crtc->name);
}
for_each_old_connector_in_state(old_state, conn, old_conn_state, i) {
commit = old_conn_state->commit;
if (!commit)
continue;
ret = wait_for_completion_timeout(&commit->hw_done,
10*HZ);
if (ret == 0)
DRM_ERROR("[CONNECTOR:%d:%s] hw_done timed out\n",
conn->base.id, conn->name);
/* Currently no support for overwriting flips, hence
* stall for previous one to execute completely. */
ret = wait_for_completion_timeout(&commit->flip_done,
10*HZ);
if (ret == 0)
DRM_ERROR("[CONNECTOR:%d:%s] flip_done timed out\n",
conn->base.id, conn->name);
}
for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
commit = old_plane_state->commit;
if (!commit)
continue;
ret = wait_for_completion_timeout(&commit->hw_done,
10*HZ);
if (ret == 0)
DRM_ERROR("[PLANE:%d:%s] hw_done timed out\n",
plane->base.id, plane->name);
/* Currently no support for overwriting flips, hence
* stall for previous one to execute completely. */
ret = wait_for_completion_timeout(&commit->flip_done,
10*HZ);
if (ret == 0)
DRM_ERROR("[PLANE:%d:%s] flip_done timed out\n",
plane->base.id, plane->name);
}
}
EXPORT_SYMBOL(drm_atomic_helper_wait_for_dependencies);
/**
* drm_atomic_helper_fake_vblank - fake VBLANK events if needed
* @old_state: atomic state object with old state structures
*
* This function walks all CRTCs and fakes VBLANK events on those with
* &drm_crtc_state.no_vblank set to true and &drm_crtc_state.event != NULL.
* The primary use of this function is writeback connectors working in oneshot
* mode and faking VBLANK events. In this case they only fake the VBLANK event
* when a job is queued, and any change to the pipeline that does not touch the
* connector is leading to timeouts when calling
* drm_atomic_helper_wait_for_vblanks() or
* drm_atomic_helper_wait_for_flip_done(). In addition to writeback
* connectors, this function can also fake VBLANK events for CRTCs without
* VBLANK interrupt.
*
* This is part of the atomic helper support for nonblocking commits, see
* drm_atomic_helper_setup_commit() for an overview.
*/
void drm_atomic_helper_fake_vblank(struct drm_atomic_state *old_state)
{
struct drm_crtc_state *new_crtc_state;
struct drm_crtc *crtc;
int i;
for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
unsigned long flags;
if (!new_crtc_state->no_vblank)
continue;
spin_lock_irqsave(&old_state->dev->event_lock, flags);
if (new_crtc_state->event) {
drm_crtc_send_vblank_event(crtc,
new_crtc_state->event);
new_crtc_state->event = NULL;
}
spin_unlock_irqrestore(&old_state->dev->event_lock, flags);
}
}
EXPORT_SYMBOL(drm_atomic_helper_fake_vblank);
/**
* drm_atomic_helper_commit_hw_done - setup possible nonblocking commit
* @old_state: atomic state object with old state structures
*
* This function is used to signal completion of the hardware commit step. After
* this step the driver is not allowed to read or change any permanent software
* or hardware modeset state. The only exception is state protected by other
* means than &drm_modeset_lock locks.
*
* Drivers should try to postpone any expensive or delayed cleanup work after
* this function is called.
*
* This is part of the atomic helper support for nonblocking commits, see
* drm_atomic_helper_setup_commit() for an overview.
*/
void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *old_state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
struct drm_crtc_commit *commit;
int i;
for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
commit = new_crtc_state->commit;
if (!commit)
continue;
/*
* copy new_crtc_state->commit to old_crtc_state->commit,
* it's unsafe to touch new_crtc_state after hw_done,
* but we still need to do so in cleanup_done().
*/
if (old_crtc_state->commit)
drm_crtc_commit_put(old_crtc_state->commit);
old_crtc_state->commit = drm_crtc_commit_get(commit);
/* backend must have consumed any event by now */
WARN_ON(new_crtc_state->event);
complete_all(&commit->hw_done);
}
if (old_state->fake_commit) {
complete_all(&old_state->fake_commit->hw_done);
complete_all(&old_state->fake_commit->flip_done);
}
}
EXPORT_SYMBOL(drm_atomic_helper_commit_hw_done);
/**
* drm_atomic_helper_commit_cleanup_done - signal completion of commit
* @old_state: atomic state object with old state structures
*
* This signals completion of the atomic update @old_state, including any
* cleanup work. If used, it must be called right before calling
* drm_atomic_state_put().
*
* This is part of the atomic helper support for nonblocking commits, see
* drm_atomic_helper_setup_commit() for an overview.
*/
void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *old_state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state;
struct drm_crtc_commit *commit;
int i;
for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
commit = old_crtc_state->commit;
if (WARN_ON(!commit))
continue;
complete_all(&commit->cleanup_done);
WARN_ON(!try_wait_for_completion(&commit->hw_done));
spin_lock(&crtc->commit_lock);
list_del(&commit->commit_entry);
spin_unlock(&crtc->commit_lock);
}
if (old_state->fake_commit) {
complete_all(&old_state->fake_commit->cleanup_done);
WARN_ON(!try_wait_for_completion(&old_state->fake_commit->hw_done));
}
}
EXPORT_SYMBOL(drm_atomic_helper_commit_cleanup_done);
/**
* drm_atomic_helper_prepare_planes - prepare plane resources before commit
* @dev: DRM device
* @state: atomic state object with new state structures
*
* This function prepares plane state, specifically framebuffers, for the new
* configuration, by calling &drm_plane_helper_funcs.prepare_fb. If any failure
* is encountered this function will call &drm_plane_helper_funcs.cleanup_fb on
* any already successfully prepared framebuffer.
*
* Returns:
* 0 on success, negative error code on failure.
*/
int drm_atomic_helper_prepare_planes(struct drm_device *dev,
struct drm_atomic_state *state)
{
struct drm_connector *connector;
struct drm_connector_state *new_conn_state;
struct drm_plane *plane;
struct drm_plane_state *new_plane_state;
int ret, i, j;
for_each_new_connector_in_state(state, connector, new_conn_state, i) {
if (!new_conn_state->writeback_job)
continue;
ret = drm_writeback_prepare_job(new_conn_state->writeback_job);
if (ret < 0)
return ret;
}
for_each_new_plane_in_state(state, plane, new_plane_state, i) {
const struct drm_plane_helper_funcs *funcs;
funcs = plane->helper_private;
if (funcs->prepare_fb) {
ret = funcs->prepare_fb(plane, new_plane_state);
if (ret)
goto fail;
}
}
return 0;
fail:
for_each_new_plane_in_state(state, plane, new_plane_state, j) {
const struct drm_plane_helper_funcs *funcs;
if (j >= i)
continue;
funcs = plane->helper_private;
if (funcs->cleanup_fb)
funcs->cleanup_fb(plane, new_plane_state);
}
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
static bool plane_crtc_active(const struct drm_plane_state *state)
{
return state->crtc && state->crtc->state->active;
}
/**
* drm_atomic_helper_commit_planes - commit plane state
* @dev: DRM device
* @old_state: atomic state object with old state structures
* @flags: flags for committing plane state
*
* This function commits the new plane state using the plane and atomic helper
* functions for planes and CRTCs. It assumes that the atomic state has already
* been pushed into the relevant object state pointers, since this step can no
* longer fail.
*
* It still requires the global state object @old_state to know which planes and
* crtcs need to be updated though.
*
* Note that this function does all plane updates across all CRTCs in one step.
* If the hardware can't support this approach look at
* drm_atomic_helper_commit_planes_on_crtc() instead.
*
* Plane parameters can be updated by applications while the associated CRTC is
* disabled. The DRM/KMS core will store the parameters in the plane state,
* which will be available to the driver when the CRTC is turned on. As a result
* most drivers don't need to be immediately notified of plane updates for a
* disabled CRTC.
*
* Unless otherwise needed, drivers are advised to set the ACTIVE_ONLY flag in
* @flags in order not to receive plane update notifications related to a
* disabled CRTC. This avoids the need to manually ignore plane updates in
* driver code when the driver and/or hardware can't or just don't need to deal
* with updates on disabled CRTCs, for example when supporting runtime PM.
*
* Drivers may set the NO_DISABLE_AFTER_MODESET flag in @flags if the relevant
* display controllers require to disable a CRTC's planes when the CRTC is
* disabled. This function would skip the &drm_plane_helper_funcs.atomic_disable
* call for a plane if the CRTC of the old plane state needs a modesetting
* operation. Of course, the drivers need to disable the planes in their CRTC
* disable callbacks since no one else would do that.
*
* The drm_atomic_helper_commit() default implementation doesn't set the
* ACTIVE_ONLY flag to most closely match the behaviour of the legacy helpers.
* This should not be copied blindly by drivers.
*/
void drm_atomic_helper_commit_planes(struct drm_device *dev,
struct drm_atomic_state *old_state,
uint32_t flags)
{
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
struct drm_plane *plane;
struct drm_plane_state *old_plane_state, *new_plane_state;
int i;
bool active_only = flags & DRM_PLANE_COMMIT_ACTIVE_ONLY;
bool no_disable = flags & DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET;
for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
const struct drm_crtc_helper_funcs *funcs;
funcs = crtc->helper_private;
if (!funcs || !funcs->atomic_begin)
continue;
if (active_only && !new_crtc_state->active)
continue;
funcs->atomic_begin(crtc, old_state);
}
for_each_oldnew_plane_in_state(old_state, plane, old_plane_state, new_plane_state, i) {
const struct drm_plane_helper_funcs *funcs;
bool disabling;
funcs = plane->helper_private;
if (!funcs)
continue;
disabling = drm_atomic_plane_disabling(old_plane_state,
new_plane_state);
if (active_only) {
/*
* Skip planes related to inactive CRTCs. If the plane
* is enabled use the state of the current CRTC. If the
* plane is being disabled use the state of the old
* CRTC to avoid skipping planes being disabled on an
* active CRTC.
*/
if (!disabling && !plane_crtc_active(new_plane_state))
continue;
if (disabling && !plane_crtc_active(old_plane_state))
continue;
}
/*
* Special-case disabling the plane if drivers support it.
*/
if (disabling && funcs->atomic_disable) {
struct drm_crtc_state *crtc_state;
crtc_state = old_plane_state->crtc->state;
if (drm_atomic_crtc_needs_modeset(crtc_state) &&
no_disable)
continue;
funcs->atomic_disable(plane, old_plane_state);
} else if (new_plane_state->crtc || disabling) {
funcs->atomic_update(plane, old_plane_state);
}
}
for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
const struct drm_crtc_helper_funcs *funcs;
funcs = crtc->helper_private;
if (!funcs || !funcs->atomic_flush)
continue;
if (active_only && !new_crtc_state->active)
continue;
funcs->atomic_flush(crtc, old_state);
}
}
EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
/**
* drm_atomic_helper_commit_planes_on_crtc - commit plane state for a CRTC
* @old_crtc_state: atomic state object with the old CRTC state
*
* This function commits the new plane state using the plane and atomic helper
* functions for planes on the specific CRTC. It assumes that the atomic state
* has already been pushed into the relevant object state pointers, since this
* step can no longer fail.
*
* This function is useful when plane updates should be done CRTC-by-CRTC
* instead of one global step like drm_atomic_helper_commit_planes() does.
*
* This function can only be savely used when planes are not allowed to move
* between different CRTCs because this function doesn't handle inter-CRTC
* depencies. Callers need to ensure that either no such depencies exist,
* resolve them through ordering of commit calls or through some other means.
*/
void
drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
{
const struct drm_crtc_helper_funcs *crtc_funcs;
struct drm_crtc *crtc = old_crtc_state->crtc;
struct drm_atomic_state *old_state = old_crtc_state->state;
struct drm_crtc_state *new_crtc_state =
drm_atomic_get_new_crtc_state(old_state, crtc);
struct drm_plane *plane;
unsigned plane_mask;
plane_mask = old_crtc_state->plane_mask;
plane_mask |= new_crtc_state->plane_mask;
crtc_funcs = crtc->helper_private;
if (crtc_funcs && crtc_funcs->atomic_begin)
crtc_funcs->atomic_begin(crtc, old_state);
drm_for_each_plane_mask(plane, crtc->dev, plane_mask) {
struct drm_plane_state *old_plane_state =
drm_atomic_get_old_plane_state(old_state, plane);
struct drm_plane_state *new_plane_state =
drm_atomic_get_new_plane_state(old_state, plane);
const struct drm_plane_helper_funcs *plane_funcs;
plane_funcs = plane->helper_private;
if (!old_plane_state || !plane_funcs)
continue;
WARN_ON(new_plane_state->crtc &&
new_plane_state->crtc != crtc);
if (drm_atomic_plane_disabling(old_plane_state, new_plane_state) &&
plane_funcs->atomic_disable)
plane_funcs->atomic_disable(plane, old_plane_state);
else if (new_plane_state->crtc ||
drm_atomic_plane_disabling(old_plane_state, new_plane_state))
plane_funcs->atomic_update(plane, old_plane_state);
}
if (crtc_funcs && crtc_funcs->atomic_flush)
crtc_funcs->atomic_flush(crtc, old_state);
}
EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc);
/**
* drm_atomic_helper_disable_planes_on_crtc - helper to disable CRTC's planes
* @old_crtc_state: atomic state object with the old CRTC state
* @atomic: if set, synchronize with CRTC's atomic_begin/flush hooks
*
* Disables all planes associated with the given CRTC. This can be
* used for instance in the CRTC helper atomic_disable callback to disable
* all planes.
*
* If the atomic-parameter is set the function calls the CRTC's
* atomic_begin hook before and atomic_flush hook after disabling the
* planes.
*
* It is a bug to call this function without having implemented the
* &drm_plane_helper_funcs.atomic_disable plane hook.
*/
void
drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
bool atomic)
{
struct drm_crtc *crtc = old_crtc_state->crtc;
const struct drm_crtc_helper_funcs *crtc_funcs =
crtc->helper_private;
struct drm_plane *plane;
if (atomic && crtc_funcs && crtc_funcs->atomic_begin)
crtc_funcs->atomic_begin(crtc, NULL);
drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) {
const struct drm_plane_helper_funcs *plane_funcs =
plane->helper_private;
if (!plane_funcs)
continue;
WARN_ON(!plane_funcs->atomic_disable);
if (plane_funcs->atomic_disable)
plane_funcs->atomic_disable(plane, NULL);
}
if (atomic && crtc_funcs && crtc_funcs->atomic_flush)
crtc_funcs->atomic_flush(crtc, NULL);
}
EXPORT_SYMBOL(drm_atomic_helper_disable_planes_on_crtc);
/**
* drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
* @dev: DRM device
* @old_state: atomic state object with old state structures
*
* This function cleans up plane state, specifically framebuffers, from the old
* configuration. Hence the old configuration must be perserved in @old_state to
* be able to call this function.
*
* This function must also be called on the new state when the atomic update
* fails at any point after calling drm_atomic_helper_prepare_planes().
*/
void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
struct drm_atomic_state *old_state)
{
struct drm_plane *plane;
struct drm_plane_state *old_plane_state, *new_plane_state;
int i;
for_each_oldnew_plane_in_state(old_state, plane, old_plane_state, new_plane_state, i) {
const struct drm_plane_helper_funcs *funcs;
struct drm_plane_state *plane_state;
/*
* This might be called before swapping when commit is aborted,
* in which case we have to cleanup the new state.
*/
if (old_plane_state == plane->state)
plane_state = new_plane_state;
else
plane_state = old_plane_state;
funcs = plane->helper_private;
if (funcs->cleanup_fb)
funcs->cleanup_fb(plane, plane_state);
}
}
EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
/**
* drm_atomic_helper_swap_state - store atomic state into current sw state
* @state: atomic state
* @stall: stall for preceeding commits
*
* This function stores the atomic state into the current state pointers in all
* driver objects. It should be called after all failing steps have been done
* and succeeded, but before the actual hardware state is committed.
*
* For cleanup and error recovery the current state for all changed objects will
* be swapped into @state.
*
* With that sequence it fits perfectly into the plane prepare/cleanup sequence:
*
* 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
*
* 2. Do any other steps that might fail.
*
* 3. Put the staged state into the current state pointers with this function.
*
* 4. Actually commit the hardware state.
*
* 5. Call drm_atomic_helper_cleanup_planes() with @state, which since step 3
* contains the old state. Also do any other cleanup required with that state.
*
* @stall must be set when nonblocking commits for this driver directly access
* the &drm_plane.state, &drm_crtc.state or &drm_connector.state pointer. With
* the current atomic helpers this is almost always the case, since the helpers
* don't pass the right state structures to the callbacks.
*
* Returns:
*
* Returns 0 on success. Can return -ERESTARTSYS when @stall is true and the
* waiting for the previous commits has been interrupted.
*/
int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
bool stall)
{
int i, ret;
struct drm_connector *connector;
struct drm_connector_state *old_conn_state, *new_conn_state;
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state, *new_crtc_state;
struct drm_plane *plane;
struct drm_plane_state *old_plane_state, *new_plane_state;
struct drm_crtc_commit *commit;
struct drm_private_obj *obj;
struct drm_private_state *old_obj_state, *new_obj_state;
if (stall) {
/*
* We have to stall for hw_done here before
* drm_atomic_helper_wait_for_dependencies() because flip
* depth > 1 is not yet supported by all drivers. As long as
* obj->state is directly dereferenced anywhere in the drivers
* atomic_commit_tail function, then it's unsafe to swap state
* before drm_atomic_helper_commit_hw_done() is called.
*/
for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) {
commit = old_crtc_state->commit;
if (!commit)
continue;
ret = wait_for_completion_interruptible(&commit->hw_done);
if (ret)
return ret;
}
for_each_old_connector_in_state(state, connector, old_conn_state, i) {
commit = old_conn_state->commit;
if (!commit)
continue;
ret = wait_for_completion_interruptible(&commit->hw_done);
if (ret)
return ret;
}
for_each_old_plane_in_state(state, plane, old_plane_state, i) {
commit = old_plane_state->commit;
if (!commit)
continue;
ret = wait_for_completion_interruptible(&commit->hw_done);
if (ret)
return ret;
}
}
for_each_oldnew_connector_in_state(state, connector, old_conn_state, new_conn_state, i) {
WARN_ON(connector->state != old_conn_state);
old_conn_state->state = state;
new_conn_state->state = NULL;
state->connectors[i].state = old_conn_state;
connector->state = new_conn_state;
}
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
WARN_ON(crtc->state != old_crtc_state);
old_crtc_state->state = state;
new_crtc_state->state = NULL;
state->crtcs[i].state = old_crtc_state;
crtc->state = new_crtc_state;
if (new_crtc_state->commit) {
spin_lock(&crtc->commit_lock);
list_add(&new_crtc_state->commit->commit_entry,
&crtc->commit_list);
spin_unlock(&crtc->commit_lock);
new_crtc_state->commit->event = NULL;
}
}
for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
WARN_ON(plane->state != old_plane_state);
old_plane_state->state = state;
new_plane_state->state = NULL;
state->planes[i].state = old_plane_state;
plane->state = new_plane_state;
}
for_each_oldnew_private_obj_in_state(state, obj, old_obj_state, new_obj_state, i) {
WARN_ON(obj->state != old_obj_state);
old_obj_state->state = state;
new_obj_state->state = NULL;
state->private_objs[i].state = old_obj_state;
obj->state = new_obj_state;
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_helper_swap_state);
/**
* drm_atomic_helper_update_plane - Helper for primary plane update using atomic
* @plane: plane object to update
* @crtc: owning CRTC of owning plane
* @fb: framebuffer to flip onto plane
* @crtc_x: x offset of primary plane on @crtc
* @crtc_y: y offset of primary plane on @crtc
* @crtc_w: width of primary plane rectangle on @crtc
* @crtc_h: height of primary plane rectangle on @crtc
* @src_x: x offset of @fb for panning
* @src_y: y offset of @fb for panning
* @src_w: width of source rectangle in @fb
* @src_h: height of source rectangle in @fb
* @ctx: lock acquire context
*
* Provides a default plane update handler using the atomic driver interface.
*
* RETURNS:
* Zero on success, error code on failure
*/
int drm_atomic_helper_update_plane(struct drm_plane *plane,
struct drm_crtc *crtc,
struct drm_framebuffer *fb,
int crtc_x, int crtc_y,
unsigned int crtc_w, unsigned int crtc_h,
uint32_t src_x, uint32_t src_y,
uint32_t src_w, uint32_t src_h,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_atomic_state *state;
struct drm_plane_state *plane_state;
int ret = 0;
state = drm_atomic_state_alloc(plane->dev);
if (!state)
return -ENOMEM;
state->acquire_ctx = ctx;
plane_state = drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state)) {
ret = PTR_ERR(plane_state);
goto fail;
}
ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
if (ret != 0)
goto fail;
drm_atomic_set_fb_for_plane(plane_state, fb);
plane_state->crtc_x = crtc_x;
plane_state->crtc_y = crtc_y;
plane_state->crtc_w = crtc_w;
plane_state->crtc_h = crtc_h;
plane_state->src_x = src_x;
plane_state->src_y = src_y;
plane_state->src_w = src_w;
plane_state->src_h = src_h;
if (plane == crtc->cursor)
state->legacy_cursor_update = true;
ret = drm_atomic_commit(state);
fail:
drm_atomic_state_put(state);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_update_plane);
/**
* drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
* @plane: plane to disable
* @ctx: lock acquire context
*
* Provides a default plane disable handler using the atomic driver interface.
*
* RETURNS:
* Zero on success, error code on failure
*/
int drm_atomic_helper_disable_plane(struct drm_plane *plane,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_atomic_state *state;
struct drm_plane_state *plane_state;
int ret = 0;
state = drm_atomic_state_alloc(plane->dev);
if (!state)
return -ENOMEM;
state->acquire_ctx = ctx;
plane_state = drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state)) {
ret = PTR_ERR(plane_state);
goto fail;
}
if (plane_state->crtc && plane_state->crtc->cursor == plane)
plane_state->state->legacy_cursor_update = true;
ret = __drm_atomic_helper_disable_plane(plane, plane_state);
if (ret != 0)
goto fail;
ret = drm_atomic_commit(state);
fail:
drm_atomic_state_put(state);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
/**
* drm_atomic_helper_set_config - set a new config from userspace
* @set: mode set configuration
* @ctx: lock acquisition context
*
* Provides a default CRTC set_config handler using the atomic driver interface.
*
* NOTE: For backwards compatibility with old userspace this automatically
* resets the "link-status" property to GOOD, to force any link
* re-training. The SETCRTC ioctl does not define whether an update does
* need a full modeset or just a plane update, hence we're allowed to do
* that. See also drm_connector_set_link_status_property().
*
* Returns:
* Returns 0 on success, negative errno numbers on failure.
*/
int drm_atomic_helper_set_config(struct drm_mode_set *set,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_atomic_state *state;
struct drm_crtc *crtc = set->crtc;
int ret = 0;
state = drm_atomic_state_alloc(crtc->dev);
if (!state)
return -ENOMEM;
state->acquire_ctx = ctx;
ret = __drm_atomic_helper_set_config(set, state);
if (ret != 0)
goto fail;
ret = handle_conflicting_encoders(state, true);
if (ret)
return ret;
ret = drm_atomic_commit(state);
fail:
drm_atomic_state_put(state);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_set_config);
/**
* drm_atomic_helper_disable_all - disable all currently active outputs
* @dev: DRM device
* @ctx: lock acquisition context
*
* Loops through all connectors, finding those that aren't turned off and then
* turns them off by setting their DPMS mode to OFF and deactivating the CRTC
* that they are connected to.
*
* This is used for example in suspend/resume to disable all currently active
* functions when suspending. If you just want to shut down everything at e.g.
* driver unload, look at drm_atomic_helper_shutdown().
*
* Note that if callers haven't already acquired all modeset locks this might
* return -EDEADLK, which must be handled by calling drm_modeset_backoff().
*
* Returns:
* 0 on success or a negative error code on failure.
*
* See also:
* drm_atomic_helper_suspend(), drm_atomic_helper_resume() and
* drm_atomic_helper_shutdown().
*/
int drm_atomic_helper_disable_all(struct drm_device *dev,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_atomic_state *state;
struct drm_connector_state *conn_state;
struct drm_connector *conn;
struct drm_plane_state *plane_state;
struct drm_plane *plane;
struct drm_crtc_state *crtc_state;
struct drm_crtc *crtc;
int ret, i;
state = drm_atomic_state_alloc(dev);
if (!state)
return -ENOMEM;
state->acquire_ctx = ctx;
drm_for_each_crtc(crtc, dev) {
crtc_state = drm_atomic_get_crtc_state(state, crtc);
if (IS_ERR(crtc_state)) {
ret = PTR_ERR(crtc_state);
goto free;
}
crtc_state->active = false;
ret = drm_atomic_set_mode_prop_for_crtc(crtc_state, NULL);
if (ret < 0)
goto free;
ret = drm_atomic_add_affected_planes(state, crtc);
if (ret < 0)
goto free;
ret = drm_atomic_add_affected_connectors(state, crtc);
if (ret < 0)
goto free;
}
for_each_new_connector_in_state(state, conn, conn_state, i) {
ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
if (ret < 0)
goto free;
}
for_each_new_plane_in_state(state, plane, plane_state, i) {
ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
if (ret < 0)
goto free;
drm_atomic_set_fb_for_plane(plane_state, NULL);
}
ret = drm_atomic_commit(state);
free:
drm_atomic_state_put(state);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_disable_all);
/**
* drm_atomic_helper_shutdown - shutdown all CRTC
* @dev: DRM device
*
* This shuts down all CRTC, which is useful for driver unloading. Shutdown on
* suspend should instead be handled with drm_atomic_helper_suspend(), since
* that also takes a snapshot of the modeset state to be restored on resume.
*
* This is just a convenience wrapper around drm_atomic_helper_disable_all(),
* and it is the atomic version of drm_crtc_force_disable_all().
*/
void drm_atomic_helper_shutdown(struct drm_device *dev)
{
struct drm_modeset_acquire_ctx ctx;
int ret;
DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
ret = drm_atomic_helper_disable_all(dev, &ctx);
if (ret)
DRM_ERROR("Disabling all crtc's during unload failed with %i\n", ret);
DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
}
EXPORT_SYMBOL(drm_atomic_helper_shutdown);
/**
* drm_atomic_helper_duplicate_state - duplicate an atomic state object
* @dev: DRM device
* @ctx: lock acquisition context
*
* Makes a copy of the current atomic state by looping over all objects and
* duplicating their respective states. This is used for example by suspend/
* resume support code to save the state prior to suspend such that it can
* be restored upon resume.
*
* Note that this treats atomic state as persistent between save and restore.
* Drivers must make sure that this is possible and won't result in confusion
* or erroneous behaviour.
*
* Note that if callers haven't already acquired all modeset locks this might
* return -EDEADLK, which must be handled by calling drm_modeset_backoff().
*
* Returns:
* A pointer to the copy of the atomic state object on success or an
* ERR_PTR()-encoded error code on failure.
*
* See also:
* drm_atomic_helper_suspend(), drm_atomic_helper_resume()
*/
struct drm_atomic_state *
drm_atomic_helper_duplicate_state(struct drm_device *dev,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_atomic_state *state;
struct drm_connector *conn;
struct drm_connector_list_iter conn_iter;
struct drm_plane *plane;
struct drm_crtc *crtc;
int err = 0;
state = drm_atomic_state_alloc(dev);
if (!state)
return ERR_PTR(-ENOMEM);
state->acquire_ctx = ctx;
state->duplicated = true;
drm_for_each_crtc(crtc, dev) {
struct drm_crtc_state *crtc_state;
crtc_state = drm_atomic_get_crtc_state(state, crtc);
if (IS_ERR(crtc_state)) {
err = PTR_ERR(crtc_state);
goto free;
}
}
drm_for_each_plane(plane, dev) {
struct drm_plane_state *plane_state;
plane_state = drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state)) {
err = PTR_ERR(plane_state);
goto free;
}
}
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(conn, &conn_iter) {
struct drm_connector_state *conn_state;
conn_state = drm_atomic_get_connector_state(state, conn);
if (IS_ERR(conn_state)) {
err = PTR_ERR(conn_state);
drm_connector_list_iter_end(&conn_iter);
goto free;
}
}
drm_connector_list_iter_end(&conn_iter);
/* clear the acquire context so that it isn't accidentally reused */
state->acquire_ctx = NULL;
free:
if (err < 0) {
drm_atomic_state_put(state);
state = ERR_PTR(err);
}
return state;
}
EXPORT_SYMBOL(drm_atomic_helper_duplicate_state);
/**
* drm_atomic_helper_suspend - subsystem-level suspend helper
* @dev: DRM device
*
* Duplicates the current atomic state, disables all active outputs and then
* returns a pointer to the original atomic state to the caller. Drivers can
* pass this pointer to the drm_atomic_helper_resume() helper upon resume to
* restore the output configuration that was active at the time the system
* entered suspend.
*
* Note that it is potentially unsafe to use this. The atomic state object
* returned by this function is assumed to be persistent. Drivers must ensure
* that this holds true. Before calling this function, drivers must make sure
* to suspend fbdev emulation so that nothing can be using the device.
*
* Returns:
* A pointer to a copy of the state before suspend on success or an ERR_PTR()-
* encoded error code on failure. Drivers should store the returned atomic
* state object and pass it to the drm_atomic_helper_resume() helper upon
* resume.
*
* See also:
* drm_atomic_helper_duplicate_state(), drm_atomic_helper_disable_all(),
* drm_atomic_helper_resume(), drm_atomic_helper_commit_duplicated_state()
*/
struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev)
{
struct drm_modeset_acquire_ctx ctx;
struct drm_atomic_state *state;
int err;
/* This can never be returned, but it makes the compiler happy */
state = ERR_PTR(-EINVAL);
DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
state = drm_atomic_helper_duplicate_state(dev, &ctx);
if (IS_ERR(state))
goto unlock;
err = drm_atomic_helper_disable_all(dev, &ctx);
if (err < 0) {
drm_atomic_state_put(state);
state = ERR_PTR(err);
goto unlock;
}
unlock:
DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
if (err)
return ERR_PTR(err);
return state;
}
EXPORT_SYMBOL(drm_atomic_helper_suspend);
/**
* drm_atomic_helper_commit_duplicated_state - commit duplicated state
* @state: duplicated atomic state to commit
* @ctx: pointer to acquire_ctx to use for commit.
*
* The state returned by drm_atomic_helper_duplicate_state() and
* drm_atomic_helper_suspend() is partially invalid, and needs to
* be fixed up before commit.
*
* Returns:
* 0 on success or a negative error code on failure.
*
* See also:
* drm_atomic_helper_suspend()
*/
int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state *state,
struct drm_modeset_acquire_ctx *ctx)
{
int i, ret;
struct drm_plane *plane;
struct drm_plane_state *new_plane_state;
struct drm_connector *connector;
struct drm_connector_state *new_conn_state;
struct drm_crtc *crtc;
struct drm_crtc_state *new_crtc_state;
state->acquire_ctx = ctx;
for_each_new_plane_in_state(state, plane, new_plane_state, i)
state->planes[i].old_state = plane->state;
for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
state->crtcs[i].old_state = crtc->state;
for_each_new_connector_in_state(state, connector, new_conn_state, i)
state->connectors[i].old_state = connector->state;
ret = drm_atomic_commit(state);
state->acquire_ctx = NULL;
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_commit_duplicated_state);
/**
* drm_atomic_helper_resume - subsystem-level resume helper
* @dev: DRM device
* @state: atomic state to resume to
*
* Calls drm_mode_config_reset() to synchronize hardware and software states,
* grabs all modeset locks and commits the atomic state object. This can be
* used in conjunction with the drm_atomic_helper_suspend() helper to
* implement suspend/resume for drivers that support atomic mode-setting.
*
* Returns:
* 0 on success or a negative error code on failure.
*
* See also:
* drm_atomic_helper_suspend()
*/
int drm_atomic_helper_resume(struct drm_device *dev,
struct drm_atomic_state *state)
{
struct drm_modeset_acquire_ctx ctx;
int err;
drm_mode_config_reset(dev);
DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
err = drm_atomic_helper_commit_duplicated_state(state, &ctx);
DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
drm_atomic_state_put(state);
return err;
}
EXPORT_SYMBOL(drm_atomic_helper_resume);
static int page_flip_common(struct drm_atomic_state *state,
struct drm_crtc *crtc,
struct drm_framebuffer *fb,
struct drm_pending_vblank_event *event,
uint32_t flags)
{
struct drm_plane *plane = crtc->primary;
struct drm_plane_state *plane_state;
struct drm_crtc_state *crtc_state;
int ret = 0;
crtc_state = drm_atomic_get_crtc_state(state, crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
crtc_state->event = event;
crtc_state->async_flip = flags & DRM_MODE_PAGE_FLIP_ASYNC;
plane_state = drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state))
return PTR_ERR(plane_state);
ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
if (ret != 0)
return ret;
drm_atomic_set_fb_for_plane(plane_state, fb);
/* Make sure we don't accidentally do a full modeset. */
state->allow_modeset = false;
if (!crtc_state->active) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] disabled, rejecting legacy flip\n",
crtc->base.id, crtc->name);
return -EINVAL;
}
return ret;
}
/**
* drm_atomic_helper_page_flip - execute a legacy page flip
* @crtc: DRM CRTC
* @fb: DRM framebuffer
* @event: optional DRM event to signal upon completion
* @flags: flip flags for non-vblank sync'ed updates
* @ctx: lock acquisition context
*
* Provides a default &drm_crtc_funcs.page_flip implementation
* using the atomic driver interface.
*
* Returns:
* Returns 0 on success, negative errno numbers on failure.
*
* See also:
* drm_atomic_helper_page_flip_target()
*/
int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
struct drm_framebuffer *fb,
struct drm_pending_vblank_event *event,
uint32_t flags,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_plane *plane = crtc->primary;
struct drm_atomic_state *state;
int ret = 0;
state = drm_atomic_state_alloc(plane->dev);
if (!state)
return -ENOMEM;
state->acquire_ctx = ctx;
ret = page_flip_common(state, crtc, fb, event, flags);
if (ret != 0)
goto fail;
ret = drm_atomic_nonblocking_commit(state);
fail:
drm_atomic_state_put(state);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_page_flip);
/**
* drm_atomic_helper_page_flip_target - do page flip on target vblank period.
* @crtc: DRM CRTC
* @fb: DRM framebuffer
* @event: optional DRM event to signal upon completion
* @flags: flip flags for non-vblank sync'ed updates
* @target: specifying the target vblank period when the flip to take effect
* @ctx: lock acquisition context
*
* Provides a default &drm_crtc_funcs.page_flip_target implementation.
* Similar to drm_atomic_helper_page_flip() with extra parameter to specify
* target vblank period to flip.
*
* Returns:
* Returns 0 on success, negative errno numbers on failure.
*/
int drm_atomic_helper_page_flip_target(struct drm_crtc *crtc,
struct drm_framebuffer *fb,
struct drm_pending_vblank_event *event,
uint32_t flags,
uint32_t target,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_plane *plane = crtc->primary;
struct drm_atomic_state *state;
struct drm_crtc_state *crtc_state;
int ret = 0;
state = drm_atomic_state_alloc(plane->dev);
if (!state)
return -ENOMEM;
state->acquire_ctx = ctx;
ret = page_flip_common(state, crtc, fb, event, flags);
if (ret != 0)
goto fail;
crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
if (WARN_ON(!crtc_state)) {
ret = -EINVAL;
goto fail;
}
crtc_state->target_vblank = target;
ret = drm_atomic_nonblocking_commit(state);
fail:
drm_atomic_state_put(state);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_page_flip_target);
/**
* drm_atomic_helper_legacy_gamma_set - set the legacy gamma correction table
* @crtc: CRTC object
* @red: red correction table
* @green: green correction table
* @blue: green correction table
* @size: size of the tables
* @ctx: lock acquire context
*
* Implements support for legacy gamma correction table for drivers
* that support color management through the DEGAMMA_LUT/GAMMA_LUT
* properties. See drm_crtc_enable_color_mgmt() and the containing chapter for
* how the atomic color management and gamma tables work.
*/
int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
u16 *red, u16 *green, u16 *blue,
uint32_t size,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_device *dev = crtc->dev;
struct drm_atomic_state *state;
struct drm_crtc_state *crtc_state;
struct drm_property_blob *blob = NULL;
struct drm_color_lut *blob_data;
int i, ret = 0;
bool replaced;
state = drm_atomic_state_alloc(crtc->dev);
if (!state)
return -ENOMEM;
blob = drm_property_create_blob(dev,
sizeof(struct drm_color_lut) * size,
NULL);
if (IS_ERR(blob)) {
ret = PTR_ERR(blob);
blob = NULL;
goto fail;
}
/* Prepare GAMMA_LUT with the legacy values. */
blob_data = blob->data;
for (i = 0; i < size; i++) {
blob_data[i].red = red[i];
blob_data[i].green = green[i];
blob_data[i].blue = blue[i];
}
state->acquire_ctx = ctx;
crtc_state = drm_atomic_get_crtc_state(state, crtc);
if (IS_ERR(crtc_state)) {
ret = PTR_ERR(crtc_state);
goto fail;
}
/* Reset DEGAMMA_LUT and CTM properties. */
replaced = drm_property_replace_blob(&crtc_state->degamma_lut, NULL);
replaced |= drm_property_replace_blob(&crtc_state->ctm, NULL);
replaced |= drm_property_replace_blob(&crtc_state->gamma_lut, blob);
crtc_state->color_mgmt_changed |= replaced;
ret = drm_atomic_commit(state);
fail:
drm_atomic_state_put(state);
drm_property_blob_put(blob);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_legacy_gamma_set);
/**
* drm_atomic_helper_bridge_propagate_bus_fmt() - Propagate output format to
* the input end of a bridge
* @bridge: bridge control structure
* @bridge_state: new bridge state
* @crtc_state: new CRTC state
* @conn_state: new connector state
* @output_fmt: tested output bus format
* @num_input_fmts: will contain the size of the returned array
*
* This helper is a pluggable implementation of the
* &drm_bridge_funcs.atomic_get_input_bus_fmts operation for bridges that don't
* modify the bus configuration between their input and their output. It
* returns an array of input formats with a single element set to @output_fmt.
*
* RETURNS:
* a valid format array of size @num_input_fmts, or NULL if the allocation
* failed
*/
u32 *
drm_atomic_helper_bridge_propagate_bus_fmt(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state,
u32 output_fmt,
unsigned int *num_input_fmts)
{
u32 *input_fmts;
input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);
if (!input_fmts) {
*num_input_fmts = 0;
return NULL;
}
*num_input_fmts = 1;
input_fmts[0] = output_fmt;
return input_fmts;
}
EXPORT_SYMBOL(drm_atomic_helper_bridge_propagate_bus_fmt);