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drm/amdgpu: Don't register backlight when another backlight should be used (v3)

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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:
- To avoid linker errors when amdgpu is builtin and video_detect.c is in
  a module, select ACPI_VIDEO and its deps if ACPI is enabled.
  When ACPI is disabled, ACPI_VIDEO is also always disabled, ensuring
  the stubs from acpi/video.h will be used.

Changes in v3:
- Use drm_info(drm_dev, "...") to log messages
- ACPI_VIDEO can now be enabled on non X86 too,
  adjust the Kconfig changes to match this.

Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Hans de Goede 2022-04-15 22:22:41 +02:00
parent b1d36e73cc
commit da11ef8329
3 changed files with 21 additions and 0 deletions
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7
drivers/gpu/drm/Kconfig
View File

@ -273,6 +273,13 @@ config DRM_AMDGPU
select BACKLIGHT_CLASS_DEVICE
select INTERVAL_TREE
select DRM_BUDDY
# amdgpu depends on ACPI_VIDEO when ACPI is enabled, for select to work
# ACPI_VIDEO's dependencies must also be selected.
select INPUT if ACPI
select ACPI_VIDEO if ACPI
# On x86 ACPI_VIDEO also needs ACPI_WMI
select X86_PLATFORM_DEVICES if ACPI && X86
select ACPI_WMI if ACPI && X86
help
Choose this option if you have a recent AMD Radeon graphics card.

7
drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
View File

@ -26,6 +26,8 @@
#include <linux/pci.h>
#include <acpi/video.h>
#include <drm/drm_crtc_helper.h>
#include <drm/amdgpu_drm.h>
#include "amdgpu.h"
@ -184,6 +186,11 @@ void amdgpu_atombios_encoder_init_backlight(struct amdgpu_encoder *amdgpu_encode
if (!(adev->mode_info.firmware_flags & ATOM_BIOS_INFO_BL_CONTROLLED_BY_GPU))
return;
if (!acpi_video_backlight_use_native()) {
drm_info(dev, "Skipping amdgpu atom DIG backlight registration\n");
return;
}
pdata = kmalloc(sizeof(struct amdgpu_backlight_privdata), GFP_KERNEL);
if (!pdata) {
DRM_ERROR("Memory allocation failed\n");

7
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -89,6 +89,8 @@
#include <drm/drm_audio_component.h>
#include <drm/drm_gem_atomic_helper.h>
#include <acpi/video.h>
#include "ivsrcid/dcn/irqsrcs_dcn_1_0.h"
#include "dcn/dcn_1_0_offset.h"
@ -4055,6 +4057,11 @@ amdgpu_dm_register_backlight_device(struct amdgpu_display_manager *dm)
amdgpu_dm_update_backlight_caps(dm, dm->num_of_edps);
dm->brightness[dm->num_of_edps] = AMDGPU_MAX_BL_LEVEL;
if (!acpi_video_backlight_use_native()) {
drm_info(adev_to_drm(dm->adev), "Skipping amdgpu DM backlight registration\n");
return;
}
props.max_brightness = AMDGPU_MAX_BL_LEVEL;
props.brightness = AMDGPU_MAX_BL_LEVEL;
props.type = BACKLIGHT_RAW;