[PATCH v4 3/3] drm/amd/display: Add support for minimum backlight quirk

[Thomas Weißschuh]

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 <li...@weissschuh.net>
---
 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 7e7929f24ae4..defa4c869921 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>
@@ -3330,6 +3331,8 @@ 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)
@@ -3364,6 +3367,13 @@ 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