From: Sherry Wang <yao.wang1@xxxxxxx>
[Why]
We try to disable abm immediately when it's being gradually
disabled, which causes backlight ramping being paused in the
middle
[How]
Don't disable abm immediately if abm has been or is being
disabled through set_abm_level path
Reviewed-by: Anthony Koo <anthony.koo@xxxxxxx>
Signed-off-by: Jerry Zuo <jerry.zuo@xxxxxxx>
Signed-off-by: Sherry Wang <yao.wang1@xxxxxxx>
---
drivers/gpu/drm/amd/display/dc/hwss/dcn21/dcn21_hwseq.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn21/dcn21_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn21/dcn21_hwseq.c
index 3de65a9f0e6f..1ea95f8d4cbc 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn21/dcn21_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn21/dcn21_hwseq.c
@@ -183,6 +183,12 @@ void dcn21_set_abm_immediate_disable(struct pipe_ctx *pipe_ctx)
struct panel_cntl *panel_cntl = pipe_ctx->stream->link->panel_cntl;
struct dmcu *dmcu = pipe_ctx->stream->ctx->dc->res_pool->dmcu;
+ // make a short term w/a for an issue that backlight ramping unexpectedly paused in the middle,
+ // will decouple backlight from ABM and redefine DMUB interface, then this w/a could be removed
+ if (pipe_ctx->stream->abm_level == 0 || pipe_ctx->stream->abm_level == ABM_LEVEL_IMMEDIATE_DISABLE) {
+ return;
+ }
+
if (dmcu) {
dce110_set_abm_immediate_disable(pipe_ctx);
return;
--
2.34.1
