From: Jaehyun Chung <jaehyun.chung@amd.com>
Date: Tue, 11 Feb 2020 16:19:41 +0000 (-0500)
Subject: drm/amd/display: Monitor patch to delay setting ignore MSA bit
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=dc326f61c51df641fbf4f42303e860f53ea163c1;p=linux.git

drm/amd/display: Monitor patch to delay setting ignore MSA bit

[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@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

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 a3bfa05c545e2..3420d098d7714 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 1490732a4b449..299f6e00f576b 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 {