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drm/bridge: panel: Name an associated backlight device

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Pass the DRM connector name to any configured backlight
device so that userspace can associate the two items.

Ideally this should be in drm_panel, but it is bridge/panel
that creates the drm_connector and therefore knows the name.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

drm/bridge: panel: Ensure backlight is reachable

Ensure that the various options of modules vs builtin results
in being able to call into the backlight code.

https://github.com/raspberrypi/linux/issues/6198

Fixes: 573f8fd0ab ("drm/bridge: panel: Name an associated backlight device")
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
This commit is contained in:
Dave Stevenson
2024-05-17 17:37:33 +01:00
committed by Dom Cobley
parent 265188c01f
commit fe55c4300b
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/bridge/panel.c
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@@ -17,6 +17,7 @@
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include <linux/backlight.h>
struct panel_bridge {
struct drm_bridge bridge;
@@ -85,6 +86,11 @@ static int panel_bridge_attach(struct drm_bridge *bridge,
drm_connector_attach_encoder(&panel_bridge->connector,
encoder);
#if IS_REACHABLE(CONFIG_BACKLIGHT_CLASS_DEVICE)
backlight_set_display_name(panel_bridge->panel->backlight,
panel_bridge->connector.name);
#endif
if (bridge->dev->registered) {
if (connector->funcs->reset)
connector->funcs->reset(connector);