[PATCH 05/21] drm/amd/display: Monitor patch to call blank_stream() before otg off

[Aurabindo Pillai]

From: Zhongwei <Zhongwei.Zhang at amd.com>

[Why]
Turning off OTG before DIG is on and backlight is on, might cause:

DIG FIFO underflow.
EDP output unexpected video data. That might violate EDP spec.
EDP spec requires black light should be off before validate
video data is turned off.

Currently garbage issue only occurs in one type of EDP to MIPI converter.

[How]
Add monitor patch to call blank_stream() before disable_crtc().
That will be no impact for current sequence.

If there are more types of EDP panels meeting this issue later,
we might remove this monitor patch and fix the current sequence.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Signed-off-by: Zhongwei <Zhongwei.Zhang at amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc_types.h               | 1 +
 drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dc_types.h b/drivers/gpu/drm/amd/display/dc/dc_types.h
index fd6dca735714..2bbafd1cdce4 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_types.h
@@ -178,6 +178,7 @@ struct dc_panel_patch {
 	unsigned int skip_avmute;
 	unsigned int mst_start_top_delay;
 	unsigned int remove_sink_ext_caps;
+	uint8_t blankstream_before_otg_off;
 };
 
 struct dc_edid_caps {
diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c
index 3d4b31bd9946..bfc78a42bc2a 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn31/dcn31_hwseq.c
@@ -517,6 +517,11 @@ static void dcn31_reset_back_end_for_pipe(
 
 	dc->hwss.set_abm_immediate_disable(pipe_ctx);
 
+	if ((!pipe_ctx->stream->dpms_off || pipe_ctx->stream->link->link_status.link_active)
+		&& pipe_ctx->stream->sink && pipe_ctx->stream->sink->edid_caps.panel_patch.blankstream_before_otg_off) {
+		dc->hwss.blank_stream(pipe_ctx);
+	}
+
 	pipe_ctx->stream_res.tg->funcs->set_dsc_config(
 			pipe_ctx->stream_res.tg,
 			OPTC_DSC_DISABLED, 0, 0);
-- 
2.46.0