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linux-next/drivers/gpu/drm/drm_client_modeset.c
Noralf Trønnes d81294afee drm/fb-helper: Remove drm_fb_helper_crtc
struct drm_fb_helper_crtc is now just a wrapper around drm_mode_set so
use that directly instead and attach it as a modeset array onto
drm_client_dev. drm_fb_helper will use this array to store its modesets
which means it will always initialize a drm_client, but it will not
register the client (callbacks) unless it's the generic fbdev emulation.

Code will later be moved to drm_client, so add code there in a new file
drm_client_modeset.c with MIT license to match drm_fb_helper.c.

The modeset connector array size is hardcoded for the cloned case to avoid
having to pass in a value from the driver. A value of 8 is chosen to err
on the safe side. This means that the max connector argument for
drm_fb_helper_init() and drm_fb_helper_fbdev_setup() isn't used anymore,
a todo entry for this is added.

In pan_display_atomic() restore_fbdev_mode_force() is used instead of
restore_fbdev_mode_atomic() because that one will later become internal
to drm_client_modeset.

Locking order:
1. drm_fb_helper->lock
2. drm_master_internal_acquire
3. drm_client_dev->modeset_mutex

v6: Improve commit message (Sam Ravnborg)

v3:
- Use full drm_client_init/release for the modesets (Daniel Vetter)
- drm_client_for_each_modeset: use lockdep_assert_held (Daniel Vetter)
- Hook up to Documentation/gpu/drm-client.rst (Daniel Vetter)

v2:
- Add modesets array to drm_client (Daniel Vetter)
- Use a new file for the modeset code (Daniel Vetter)
- File has to be MIT licensed (Emmanuel Vadot)
- Add copyrights from drm_fb_helper.c

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190531140117.37751-3-noralf@tronnes.org
2019-06-04 12:13:47 +02:00

105 lines
2.6 KiB
C

// SPDX-License-Identifier: MIT
/*
* Copyright 2018 Noralf Trønnes
* Copyright (c) 2006-2009 Red Hat Inc.
* Copyright (c) 2006-2008 Intel Corporation
* Jesse Barnes <jesse.barnes@intel.com>
* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
*/
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <drm/drm_client.h>
#include <drm/drm_crtc.h>
#include <drm/drm_device.h>
int drm_client_modeset_create(struct drm_client_dev *client)
{
struct drm_device *dev = client->dev;
unsigned int num_crtc = dev->mode_config.num_crtc;
unsigned int max_connector_count = 1;
struct drm_mode_set *modeset;
struct drm_crtc *crtc;
unsigned int i = 0;
/* Add terminating zero entry to enable index less iteration */
client->modesets = kcalloc(num_crtc + 1, sizeof(*client->modesets), GFP_KERNEL);
if (!client->modesets)
return -ENOMEM;
mutex_init(&client->modeset_mutex);
drm_for_each_crtc(crtc, dev)
client->modesets[i++].crtc = crtc;
/* Cloning is only supported in the single crtc case. */
if (num_crtc == 1)
max_connector_count = DRM_CLIENT_MAX_CLONED_CONNECTORS;
for (modeset = client->modesets; modeset->crtc; modeset++) {
modeset->connectors = kcalloc(max_connector_count,
sizeof(*modeset->connectors), GFP_KERNEL);
if (!modeset->connectors)
goto err_free;
}
return 0;
err_free:
drm_client_modeset_free(client);
return -ENOMEM;
}
void drm_client_modeset_release(struct drm_client_dev *client)
{
struct drm_mode_set *modeset;
unsigned int i;
drm_client_for_each_modeset(modeset, client) {
drm_mode_destroy(client->dev, modeset->mode);
modeset->mode = NULL;
modeset->fb = NULL;
for (i = 0; i < modeset->num_connectors; i++) {
drm_connector_put(modeset->connectors[i]);
modeset->connectors[i] = NULL;
}
modeset->num_connectors = 0;
}
}
/* TODO: Remove export when modeset code has been moved over */
EXPORT_SYMBOL(drm_client_modeset_release);
void drm_client_modeset_free(struct drm_client_dev *client)
{
struct drm_mode_set *modeset;
mutex_lock(&client->modeset_mutex);
drm_client_modeset_release(client);
drm_client_for_each_modeset(modeset, client)
kfree(modeset->connectors);
mutex_unlock(&client->modeset_mutex);
mutex_destroy(&client->modeset_mutex);
kfree(client->modesets);
}
struct drm_mode_set *drm_client_find_modeset(struct drm_client_dev *client, struct drm_crtc *crtc)
{
struct drm_mode_set *modeset;
drm_client_for_each_modeset(modeset, client)
if (modeset->crtc == crtc)
return modeset;
return NULL;
}
/* TODO: Remove export when modeset code has been moved over */
EXPORT_SYMBOL(drm_client_find_modeset);