mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
c44264f9f7
-----BEGIN PGP SIGNATURE----- iQFSBAABCAA8FiEEq68RxlopcLEwq+PEeb4+QwBBGIYFAl8nLmkeHHRvcnZhbGRz QGxpbnV4LWZvdW5kYXRpb24ub3JnAAoJEHm+PkMAQRiGBEkH/RJAnEan4gcdkBDf 2xS0yk4XLMjKZwbz61VSeKMUBkGCsh1cWsaAtJJAIVYj/6o/7mld01sZCnOASLnJ ET0nXL2NiT/f+prYkTE5qeYH225/Yfh5jgmrqZtx/uXFCwgE5Nzi3f72IXQDmCR+ kmpNhNox3YqQTKXhv7DXobDKcO0n8nZavnhxmA9SBZn2h9RHvmvJghD0UOfLjMpA 1SbknaE67n5JN/JjI6TkYWk4nuJmqfvmBL5IYVDEZYO4UlM5Bqzhw0XN7Ax70K3M KRK/eiqRmNwun5MxWnbzQU7t7iTgVmzjHLTpWGcM3V4blgGXC3uhjc+p/R8KTQUE bIydSzs= =fDeo -----END PGP SIGNATURE----- Merge tag 'v5.8' into drm-next I need to backmerge 5.8 as I've got a bunch of fixes sitting on an rc7 base that I want to land. Signed-off-by: Dave Airlie <airlied@redhat.com>
400 lines
11 KiB
C
400 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#include <linux/component.h>
|
|
#include <linux/export.h>
|
|
#include <linux/list.h>
|
|
#include <linux/of_graph.h>
|
|
|
|
#include <drm/drm_bridge.h>
|
|
#include <drm/drm_crtc.h>
|
|
#include <drm/drm_device.h>
|
|
#include <drm/drm_encoder.h>
|
|
#include <drm/drm_of.h>
|
|
#include <drm/drm_panel.h>
|
|
|
|
/**
|
|
* DOC: overview
|
|
*
|
|
* A set of helper functions to aid DRM drivers in parsing standard DT
|
|
* properties.
|
|
*/
|
|
|
|
static void drm_release_of(struct device *dev, void *data)
|
|
{
|
|
of_node_put(data);
|
|
}
|
|
|
|
/**
|
|
* drm_of_crtc_port_mask - find the mask of a registered CRTC by port OF node
|
|
* @dev: DRM device
|
|
* @port: port OF node
|
|
*
|
|
* Given a port OF node, return the possible mask of the corresponding
|
|
* CRTC within a device's list of CRTCs. Returns zero if not found.
|
|
*/
|
|
uint32_t drm_of_crtc_port_mask(struct drm_device *dev,
|
|
struct device_node *port)
|
|
{
|
|
unsigned int index = 0;
|
|
struct drm_crtc *tmp;
|
|
|
|
drm_for_each_crtc(tmp, dev) {
|
|
if (tmp->port == port)
|
|
return 1 << index;
|
|
|
|
index++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_of_crtc_port_mask);
|
|
|
|
/**
|
|
* drm_of_find_possible_crtcs - find the possible CRTCs for an encoder port
|
|
* @dev: DRM device
|
|
* @port: encoder port to scan for endpoints
|
|
*
|
|
* Scan all endpoints attached to a port, locate their attached CRTCs,
|
|
* and generate the DRM mask of CRTCs which may be attached to this
|
|
* encoder.
|
|
*
|
|
* See Documentation/devicetree/bindings/graph.txt for the bindings.
|
|
*/
|
|
uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
|
|
struct device_node *port)
|
|
{
|
|
struct device_node *remote_port, *ep;
|
|
uint32_t possible_crtcs = 0;
|
|
|
|
for_each_endpoint_of_node(port, ep) {
|
|
remote_port = of_graph_get_remote_port(ep);
|
|
if (!remote_port) {
|
|
of_node_put(ep);
|
|
return 0;
|
|
}
|
|
|
|
possible_crtcs |= drm_of_crtc_port_mask(dev, remote_port);
|
|
|
|
of_node_put(remote_port);
|
|
}
|
|
|
|
return possible_crtcs;
|
|
}
|
|
EXPORT_SYMBOL(drm_of_find_possible_crtcs);
|
|
|
|
/**
|
|
* drm_of_component_match_add - Add a component helper OF node match rule
|
|
* @master: master device
|
|
* @matchptr: component match pointer
|
|
* @compare: compare function used for matching component
|
|
* @node: of_node
|
|
*/
|
|
void drm_of_component_match_add(struct device *master,
|
|
struct component_match **matchptr,
|
|
int (*compare)(struct device *, void *),
|
|
struct device_node *node)
|
|
{
|
|
of_node_get(node);
|
|
component_match_add_release(master, matchptr, drm_release_of,
|
|
compare, node);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_of_component_match_add);
|
|
|
|
/**
|
|
* drm_of_component_probe - Generic probe function for a component based master
|
|
* @dev: master device containing the OF node
|
|
* @compare_of: compare function used for matching components
|
|
* @m_ops: component master ops to be used
|
|
*
|
|
* Parse the platform device OF node and bind all the components associated
|
|
* with the master. Interface ports are added before the encoders in order to
|
|
* satisfy their .bind requirements
|
|
* See Documentation/devicetree/bindings/graph.txt for the bindings.
|
|
*
|
|
* Returns zero if successful, or one of the standard error codes if it fails.
|
|
*/
|
|
int drm_of_component_probe(struct device *dev,
|
|
int (*compare_of)(struct device *, void *),
|
|
const struct component_master_ops *m_ops)
|
|
{
|
|
struct device_node *ep, *port, *remote;
|
|
struct component_match *match = NULL;
|
|
int i;
|
|
|
|
if (!dev->of_node)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Bind the crtc's ports first, so that drm_of_find_possible_crtcs()
|
|
* called from encoder's .bind callbacks works as expected
|
|
*/
|
|
for (i = 0; ; i++) {
|
|
port = of_parse_phandle(dev->of_node, "ports", i);
|
|
if (!port)
|
|
break;
|
|
|
|
if (of_device_is_available(port->parent))
|
|
drm_of_component_match_add(dev, &match, compare_of,
|
|
port);
|
|
|
|
of_node_put(port);
|
|
}
|
|
|
|
if (i == 0) {
|
|
dev_err(dev, "missing 'ports' property\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!match) {
|
|
dev_err(dev, "no available port\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* For bound crtcs, bind the encoders attached to their remote endpoint
|
|
*/
|
|
for (i = 0; ; i++) {
|
|
port = of_parse_phandle(dev->of_node, "ports", i);
|
|
if (!port)
|
|
break;
|
|
|
|
if (!of_device_is_available(port->parent)) {
|
|
of_node_put(port);
|
|
continue;
|
|
}
|
|
|
|
for_each_child_of_node(port, ep) {
|
|
remote = of_graph_get_remote_port_parent(ep);
|
|
if (!remote || !of_device_is_available(remote)) {
|
|
of_node_put(remote);
|
|
continue;
|
|
} else if (!of_device_is_available(remote->parent)) {
|
|
dev_warn(dev, "parent device of %pOF is not available\n",
|
|
remote);
|
|
of_node_put(remote);
|
|
continue;
|
|
}
|
|
|
|
drm_of_component_match_add(dev, &match, compare_of,
|
|
remote);
|
|
of_node_put(remote);
|
|
}
|
|
of_node_put(port);
|
|
}
|
|
|
|
return component_master_add_with_match(dev, m_ops, match);
|
|
}
|
|
EXPORT_SYMBOL(drm_of_component_probe);
|
|
|
|
/*
|
|
* drm_of_encoder_active_endpoint - return the active encoder endpoint
|
|
* @node: device tree node containing encoder input ports
|
|
* @encoder: drm_encoder
|
|
*
|
|
* Given an encoder device node and a drm_encoder with a connected crtc,
|
|
* parse the encoder endpoint connecting to the crtc port.
|
|
*/
|
|
int drm_of_encoder_active_endpoint(struct device_node *node,
|
|
struct drm_encoder *encoder,
|
|
struct of_endpoint *endpoint)
|
|
{
|
|
struct device_node *ep;
|
|
struct drm_crtc *crtc = encoder->crtc;
|
|
struct device_node *port;
|
|
int ret;
|
|
|
|
if (!node || !crtc)
|
|
return -EINVAL;
|
|
|
|
for_each_endpoint_of_node(node, ep) {
|
|
port = of_graph_get_remote_port(ep);
|
|
of_node_put(port);
|
|
if (port == crtc->port) {
|
|
ret = of_graph_parse_endpoint(ep, endpoint);
|
|
of_node_put(ep);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
|
|
|
|
/**
|
|
* drm_of_find_panel_or_bridge - return connected panel or bridge device
|
|
* @np: device tree node containing encoder output ports
|
|
* @port: port in the device tree node
|
|
* @endpoint: endpoint in the device tree node
|
|
* @panel: pointer to hold returned drm_panel
|
|
* @bridge: pointer to hold returned drm_bridge
|
|
*
|
|
* Given a DT node's port and endpoint number, find the connected node and
|
|
* return either the associated struct drm_panel or drm_bridge device. Either
|
|
* @panel or @bridge must not be NULL.
|
|
*
|
|
* Returns zero if successful, or one of the standard error codes if it fails.
|
|
*/
|
|
int drm_of_find_panel_or_bridge(const struct device_node *np,
|
|
int port, int endpoint,
|
|
struct drm_panel **panel,
|
|
struct drm_bridge **bridge)
|
|
{
|
|
int ret = -EPROBE_DEFER;
|
|
struct device_node *remote;
|
|
|
|
if (!panel && !bridge)
|
|
return -EINVAL;
|
|
if (panel)
|
|
*panel = NULL;
|
|
|
|
/*
|
|
* of_graph_get_remote_node() produces a noisy error message if port
|
|
* node isn't found and the absence of the port is a legit case here,
|
|
* so at first we silently check whether graph presents in the
|
|
* device-tree node.
|
|
*/
|
|
if (!of_graph_is_present(np))
|
|
return -ENODEV;
|
|
|
|
remote = of_graph_get_remote_node(np, port, endpoint);
|
|
if (!remote)
|
|
return -ENODEV;
|
|
|
|
if (panel) {
|
|
*panel = of_drm_find_panel(remote);
|
|
if (!IS_ERR(*panel))
|
|
ret = 0;
|
|
else
|
|
*panel = NULL;
|
|
}
|
|
|
|
/* No panel found yet, check for a bridge next. */
|
|
if (bridge) {
|
|
if (ret) {
|
|
*bridge = of_drm_find_bridge(remote);
|
|
if (*bridge)
|
|
ret = 0;
|
|
} else {
|
|
*bridge = NULL;
|
|
}
|
|
|
|
}
|
|
|
|
of_node_put(remote);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge);
|
|
|
|
enum drm_of_lvds_pixels {
|
|
DRM_OF_LVDS_EVEN = BIT(0),
|
|
DRM_OF_LVDS_ODD = BIT(1),
|
|
};
|
|
|
|
static int drm_of_lvds_get_port_pixels_type(struct device_node *port_node)
|
|
{
|
|
bool even_pixels =
|
|
of_property_read_bool(port_node, "dual-lvds-even-pixels");
|
|
bool odd_pixels =
|
|
of_property_read_bool(port_node, "dual-lvds-odd-pixels");
|
|
|
|
return (even_pixels ? DRM_OF_LVDS_EVEN : 0) |
|
|
(odd_pixels ? DRM_OF_LVDS_ODD : 0);
|
|
}
|
|
|
|
static int drm_of_lvds_get_remote_pixels_type(
|
|
const struct device_node *port_node)
|
|
{
|
|
struct device_node *endpoint = NULL;
|
|
int pixels_type = -EPIPE;
|
|
|
|
for_each_child_of_node(port_node, endpoint) {
|
|
struct device_node *remote_port;
|
|
int current_pt;
|
|
|
|
if (!of_node_name_eq(endpoint, "endpoint"))
|
|
continue;
|
|
|
|
remote_port = of_graph_get_remote_port(endpoint);
|
|
if (!remote_port) {
|
|
of_node_put(remote_port);
|
|
return -EPIPE;
|
|
}
|
|
|
|
current_pt = drm_of_lvds_get_port_pixels_type(remote_port);
|
|
of_node_put(remote_port);
|
|
if (pixels_type < 0)
|
|
pixels_type = current_pt;
|
|
|
|
/*
|
|
* Sanity check, ensure that all remote endpoints have the same
|
|
* pixel type. We may lift this restriction later if we need to
|
|
* support multiple sinks with different dual-link
|
|
* configurations by passing the endpoints explicitly to
|
|
* drm_of_lvds_get_dual_link_pixel_order().
|
|
*/
|
|
if (!current_pt || pixels_type != current_pt)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return pixels_type;
|
|
}
|
|
|
|
/**
|
|
* drm_of_lvds_get_dual_link_pixel_order - Get LVDS dual-link pixel order
|
|
* @port1: First DT port node of the Dual-link LVDS source
|
|
* @port2: Second DT port node of the Dual-link LVDS source
|
|
*
|
|
* An LVDS dual-link connection is made of two links, with even pixels
|
|
* transitting on one link, and odd pixels on the other link. This function
|
|
* returns, for two ports of an LVDS dual-link source, which port shall transmit
|
|
* the even and odd pixels, based on the requirements of the connected sink.
|
|
*
|
|
* The pixel order is determined from the dual-lvds-even-pixels and
|
|
* dual-lvds-odd-pixels properties in the sink's DT port nodes. If those
|
|
* properties are not present, or if their usage is not valid, this function
|
|
* returns -EINVAL.
|
|
*
|
|
* If either port is not connected, this function returns -EPIPE.
|
|
*
|
|
* @port1 and @port2 are typically DT sibling nodes, but may have different
|
|
* parents when, for instance, two separate LVDS encoders carry the even and odd
|
|
* pixels.
|
|
*
|
|
* Return:
|
|
* * DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS - @port1 carries even pixels and @port2
|
|
* carries odd pixels
|
|
* * DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS - @port1 carries odd pixels and @port2
|
|
* carries even pixels
|
|
* * -EINVAL - @port1 and @port2 are not connected to a dual-link LVDS sink, or
|
|
* the sink configuration is invalid
|
|
* * -EPIPE - when @port1 or @port2 are not connected
|
|
*/
|
|
int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1,
|
|
const struct device_node *port2)
|
|
{
|
|
int remote_p1_pt, remote_p2_pt;
|
|
|
|
if (!port1 || !port2)
|
|
return -EINVAL;
|
|
|
|
remote_p1_pt = drm_of_lvds_get_remote_pixels_type(port1);
|
|
if (remote_p1_pt < 0)
|
|
return remote_p1_pt;
|
|
|
|
remote_p2_pt = drm_of_lvds_get_remote_pixels_type(port2);
|
|
if (remote_p2_pt < 0)
|
|
return remote_p2_pt;
|
|
|
|
/*
|
|
* A valid dual-lVDS bus is found when one remote port is marked with
|
|
* "dual-lvds-even-pixels", and the other remote port is marked with
|
|
* "dual-lvds-odd-pixels", bail out if the markers are not right.
|
|
*/
|
|
if (remote_p1_pt + remote_p2_pt != DRM_OF_LVDS_EVEN + DRM_OF_LVDS_ODD)
|
|
return -EINVAL;
|
|
|
|
return remote_p1_pt == DRM_OF_LVDS_EVEN ?
|
|
DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS :
|
|
DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_of_lvds_get_dual_link_pixel_order);
|