On 11/1/2024 08:49, Zaeem Mohamed wrote:
From: Tom Chung <chiahsuan.chung@xxxxxxx>
[Why]
During boot up and resume the DC layer will reset the panel
brightness to fix a flicker issue.
It will cause the dm->actual_brightness is not the current panel
brightness level. (the dm->brightness is the correct panel level)
[How]
Set the backlight level after do the set mode.
Reviewed-by: Sun peng Li <sunpeng.li@xxxxxxx>
Signed-off-by: Tom Chung <chiahsuan.chung@xxxxxxx>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@xxxxxxx>
Some more tags, please explicitly add these while merging.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: d9e865826c20 ("drm/amd/display: Simplify brightness initialization")
Reported-by: Mark Herbert <mark.herbert42@xxxxxxxxx>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3655
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 15 +++++++++++++++
1 file changed, 15 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 bbfc47f6595f..2599a99509de 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -9411,6 +9411,7 @@ static void amdgpu_dm_commit_streams(struct drm_atomic_state *state,
bool mode_set_reset_required = false;
u32 i;
struct dc_commit_streams_params params = {dc_state->streams, dc_state->stream_count};
+ bool set_backlight_level = false;
/* Disable writeback */
for_each_old_connector_in_state(state, connector, old_con_state, i) {
@@ -9530,6 +9531,7 @@ static void amdgpu_dm_commit_streams(struct drm_atomic_state *state,
acrtc->hw_mode = new_crtc_state->mode;
crtc->hwmode = new_crtc_state->mode;
mode_set_reset_required = true;
+ set_backlight_level = true;
} else if (modereset_required(new_crtc_state)) {
drm_dbg_atomic(dev,
"Atomic commit: RESET. crtc id %d:[%p]\n",
@@ -9581,6 +9583,19 @@ static void amdgpu_dm_commit_streams(struct drm_atomic_state *state,
acrtc->otg_inst = status->primary_otg_inst;
}
}
+
+ /* During boot up and resume the DC layer will reset the panel brightness
+ * to fix a flicker issue.
+ * It will cause the dm->actual_brightness is not the current panel brightness
+ * level. (the dm->brightness is the correct panel level)
+ * So we set the backlight level with dm->brightness value after set mode
+ */
+ if (set_backlight_level) {
+ for (i = 0; i < dm->num_of_edps; i++) {
+ if (dm->backlight_dev[i])
+ amdgpu_dm_backlight_set_level(dm, i, dm->brightness[i]);
+ }
+ }
}
static void dm_set_writeback(struct amdgpu_display_manager *dm,
