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drm/connector: Add a fwnode pointer to drm_connector and register with ACPI (v2)

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Add a fwnode pointer to struct drm_connector and register an acpi_bus_type
for the connectors with the ACPI subsystem (when CONFIG_ACPI is enabled).

The adding of the fwnode pointer allows drivers to associate a fwnode
that represents a connector with that connector.

When the new fwnode pointer points to an ACPI-companion, then the new
acpi_bus_type will cause the ACPI subsys to bind the device instantiated
for the connector with the fwnode by calling acpi_bind_one(). This will
result in a firmware_node symlink under /sys/class/card#-<connecter-name>/
which helps to verify that the fwnode-s and connectors are properly
matched.

Changes in v2:
- Make drm_connector_cleanup() call fwnode_handle_put() on
  connector->fwnode and document this

Co-developed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://lore.kernel.org/r/20210817215201.795062-3-hdegoede@redhat.com
This commit is contained in:
Hans de Goede 2021-08-17 23:51:55 +02:00
parent 331de7db30
commit 48c429c6d1
3 changed files with 47 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/drm_connector.c
View File

@ -474,6 +474,8 @@ void drm_connector_cleanup(struct drm_connector *connector)
drm_mode_object_unregister(dev, &connector->base);
kfree(connector->name);
connector->name = NULL;
fwnode_handle_put(connector->fwnode);
connector->fwnode = NULL;
spin_lock_irq(&dev->mode_config.connector_list_lock);
list_del(&connector->head);
dev->mode_config.num_connector--;

37
drivers/gpu/drm/drm_sysfs.c
View File

@ -10,6 +10,7 @@
* Copyright (c) 2003-2004 IBM Corp.
*/
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/export.h>
@ -56,6 +57,39 @@ static struct device_type drm_sysfs_device_connector = {
struct class *drm_class;
#ifdef CONFIG_ACPI
static bool drm_connector_acpi_bus_match(struct device *dev)
{
return dev->type == &drm_sysfs_device_connector;
}
static struct acpi_device *drm_connector_acpi_find_companion(struct device *dev)
{
struct drm_connector *connector = to_drm_connector(dev);
return to_acpi_device_node(connector->fwnode);
}
static struct acpi_bus_type drm_connector_acpi_bus = {
.name = "drm_connector",
.match = drm_connector_acpi_bus_match,
.find_companion = drm_connector_acpi_find_companion,
};
static void drm_sysfs_acpi_register(void)
{
register_acpi_bus_type(&drm_connector_acpi_bus);
}
static void drm_sysfs_acpi_unregister(void)
{
unregister_acpi_bus_type(&drm_connector_acpi_bus);
}
#else
static void drm_sysfs_acpi_register(void) { }
static void drm_sysfs_acpi_unregister(void) { }
#endif
static char *drm_devnode(struct device *dev, umode_t *mode)
{
return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
@ -89,6 +123,8 @@ int drm_sysfs_init(void)
}
drm_class->devnode = drm_devnode;
drm_sysfs_acpi_register();
return 0;
}
@ -101,6 +137,7 @@ void drm_sysfs_destroy(void)
{
if (IS_ERR_OR_NULL(drm_class))
return;
drm_sysfs_acpi_unregister();
class_remove_file(drm_class, &class_attr_version.attr);
class_destroy(drm_class);
drm_class = NULL;

8
include/drm/drm_connector.h
View File

@ -1228,6 +1228,14 @@ struct drm_connector {
struct device *kdev;
/** @attr: sysfs attributes */
struct device_attribute *attr;
/**
* @fwnode: associated fwnode supplied by platform firmware
*
* Drivers can set this to associate a fwnode with a connector, drivers
* are expected to get a reference on the fwnode when setting this.
* drm_connector_cleanup() will call fwnode_handle_put() on this.
*/
struct fwnode_handle *fwnode;
/**
* @head: