From: Jaehyun Chung <jaehyun.chung@xxxxxxx>
[Why]
Some displays clear ignore MSA bit on mode change, which cause
blackscreen when programming variable vtotals. Ignore MSA bit needs
programming needs to be delayed or re-set to be retained.
[How]
Create patch to delay programming ignore MSA bit after unblanking
stream.
Signed-off-by: Jaehyun Chung <jaehyun.chung@xxxxxxx>
Reviewed-by: Aric Cyr <Aric.Cyr@xxxxxxx>
Acked-by: Anthony Koo <Anthony.Koo@xxxxxxx>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Acked-by: Harry Wentland <harry.wentland@xxxxxxx>
---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 3 +++
drivers/gpu/drm/amd/display/dc/dc_types.h | 1 +
2 files changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index a3bfa05c545e..3420d098d771 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -3095,6 +3095,9 @@ void core_link_enable_stream(
dc->hwss.unblank_stream(pipe_ctx,
&pipe_ctx->stream->link->cur_link_settings);
+ if (stream->link->local_sink->edid_caps.panel_patch.delay_ignore_msa > 0)
+ msleep(stream->link->local_sink->edid_caps.panel_patch.delay_ignore_msa);
+
if (dc_is_dp_signal(pipe_ctx->stream->signal))
enable_stream_features(pipe_ctx);
#if defined(CONFIG_DRM_AMD_DC_HDCP)
diff --git a/drivers/gpu/drm/amd/display/dc/dc_types.h b/drivers/gpu/drm/amd/display/dc/dc_types.h
index 1490732a4b44..299f6e00f576 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_types.h
@@ -230,6 +230,7 @@ struct dc_panel_patch {
unsigned int extra_delay_backlight_off;
unsigned int extra_t7_ms;
unsigned int skip_scdc_overwrite;
+ unsigned int delay_ignore_msa;
};
struct dc_edid_caps {
--
2.25.0
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