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drm/i915: Don't register backlight when another backlight should be used (v2)

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Before this commit when we want userspace to use the acpi_video backlight
device we register both the GPU's native backlight device and acpi_video's
firmware acpi_video# backlight device. This relies on userspace preferring
firmware type backlight devices over native ones.

Registering 2 backlight devices for a single display really is
undesirable, don't register the GPU's native backlight device when
another backlight device should be used.

Changes in v2:
- Use drm_info(drm_dev,  ...) for log messages

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Hans de Goede 2022-04-15 21:55:35 +02:00
parent 2600bfa3df
commit b1d36e73cc
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/i915/display/intel_backlight.c
View file

@ -8,6 +8,8 @@
#include <linux/pwm.h>
#include <linux/string_helpers.h>
#include <acpi/video.h>
#include "intel_backlight.h"
#include "intel_connector.h"
#include "intel_de.h"
@ -950,6 +952,11 @@ int intel_backlight_device_register(struct intel_connector *connector)
WARN_ON(panel->backlight.max == 0);
if (!acpi_video_backlight_use_native()) {
drm_info(&i915->drm, "Skipping intel_backlight registration\n");
return 0;
}
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;