From: Mario Limonciello <mario.limoncie...@amd.com>
[Why]
GPU reset will attempt to restore cached state, but brightness doesn't
get restored. It will come back at 100% brightness, but userspace thinks
it's the previous value.
[How]
When running resume sequence if GPU is in reset restore brightness
to previous value.
Acked-by: Wayne Lin <wayne....@amd.com>
Signed-off-by: Mario Limonciello <mario.limoncie...@amd.com>
Signed-off-by: Tom Chung <chiahsuan.ch...@amd.com>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 ++++++++++
1 file changed, 10 insertions(+)
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 6e2dd3555165..60fbf2683880 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -249,6 +249,10 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
static void handle_hpd_irq_helper(struct amdgpu_dm_connector *aconnector);
static void handle_hpd_rx_irq(void *param);
+static void amdgpu_dm_backlight_set_level(struct amdgpu_display_manager *dm,
+ int bl_idx,
+ u32 user_brightness);
+
static bool
is_timing_unchanged_for_freesync(struct drm_crtc_state *old_crtc_state,
struct drm_crtc_state *new_crtc_state);
@@ -3411,6 +3415,12 @@ static int dm_resume(struct amdgpu_ip_block *ip_block)
mutex_unlock(&dm->dc_lock);
+ /* set the backlight after a reset */
+ for (i = 0; i < dm->num_of_edps; i++) {
+ if (dm->backlight_dev[i])
+ amdgpu_dm_backlight_set_level(dm, i,
dm->brightness[i]);
+ }
+
return 0;
}
/* Recreate dc_state - DC invalidates it when setting power state to
S3. */
--
2.34.1
