Not all platforms provide correct PWM backlight capabilities through ATIF. Use the generic drm panel minimum backlight quirk infrastructure to override the capabilities where necessary. Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx> Tested-by: Dustin L. Howett <dustin@xxxxxxxxxx> --- drivers/gpu/drm/amd/amdgpu/Kconfig | 1 + drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/Kconfig b/drivers/gpu/drm/amd/amdgpu/Kconfig index 0051fb1b437f..655c10aef2e3 100644 --- a/drivers/gpu/drm/amd/amdgpu/Kconfig +++ b/drivers/gpu/drm/amd/amdgpu/Kconfig @@ -23,6 +23,7 @@ config DRM_AMDGPU select DRM_BUDDY select DRM_SUBALLOC_HELPER select DRM_EXEC + select DRM_PANEL_BACKLIGHT_QUIRKS # 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 diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 983a977632ff..056960ea335c 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -93,6 +93,7 @@ #include <drm/drm_fourcc.h> #include <drm/drm_edid.h> #include <drm/drm_eld.h> +#include <drm/drm_utils.h> #include <drm/drm_vblank.h> #include <drm/drm_audio_component.h> #include <drm/drm_gem_atomic_helper.h> @@ -3333,6 +3334,8 @@ static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector) struct drm_connector *conn_base; struct amdgpu_device *adev; struct drm_luminance_range_info *luminance_range; + const struct drm_edid *drm_edid; + int min_input_signal_override; if (aconnector->bl_idx == -1 || aconnector->dc_link->connector_signal != SIGNAL_TYPE_EDP) @@ -3367,6 +3370,13 @@ static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector) caps->aux_min_input_signal = 0; caps->aux_max_input_signal = 512; } + + drm_edid = drm_edid_alloc(aconnector->edid, + EDID_LENGTH * (aconnector->edid->extensions + 1)); + min_input_signal_override = drm_get_panel_min_brightness_quirk(drm_edid); + drm_edid_free(drm_edid); + if (min_input_signal_override >= 0) + caps->min_input_signal = min_input_signal_override; } void amdgpu_dm_update_connector_after_detect( -- 2.46.0
