drm: panel-backlight-quirks: Log applied panel brightness quirks

Currently, when a panel brightness quirk is applied, there is no log
indicating that a quirk was applied. Unwrap the drm device on its own
and use drm_info() to log when a quirk is applied.

Suggested-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Antheas Kapenekakis <lkml@antheas.dev>
Link: https://lore.kernel.org/r/20250829145541.512671-7-lkml@antheas.dev
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
(Correct a missing -1 in the message math)
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

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 156f2aae682874c3de18ab1b3358512856616c51..18f0e0912ea63dc487b84ecf82eb7b64a0058412 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3617,13 +3617,15 @@ 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;
+       struct drm_device *drm;
 
        if (aconnector->bl_idx == -1 ||
            aconnector->dc_link->connector_signal != SIGNAL_TYPE_EDP)
                return;
 
        conn_base = &aconnector->base;
-       adev = drm_to_adev(conn_base->dev);
+       drm = conn_base->dev;
+       adev = drm_to_adev(drm);
 
        caps = &adev->dm.backlight_caps[aconnector->bl_idx];
        caps->ext_caps = &aconnector->dc_link->dpcd_sink_ext_caps;
@@ -3659,12 +3661,20 @@ static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
        panel_backlight_quirk =
                drm_get_panel_backlight_quirk(aconnector->drm_edid);
        if (!IS_ERR_OR_NULL(panel_backlight_quirk)) {
-               if (panel_backlight_quirk->min_brightness)
+               if (panel_backlight_quirk->min_brightness) {
                        caps->min_input_signal =
                                panel_backlight_quirk->min_brightness - 1;
-               if (panel_backlight_quirk->brightness_mask)
+                       drm_info(drm,
+                                "Applying panel backlight quirk, min_brightness: %d\n",
+                                caps->min_input_signal);
+               }
+               if (panel_backlight_quirk->brightness_mask) {
+                       drm_info(drm,
+                                "Applying panel backlight quirk, brightness_mask: 0x%X\n",
+                                panel_backlight_quirk->brightness_mask);
                        caps->brightness_mask =
                                panel_backlight_quirk->brightness_mask;
+               }
        }
 }