[PATCH v3 14/16] drm/amd/display: Write DSC enable to MST DPCD

[David Francis <David.Francis@xxxxxxx>]

Rework the dm_helpers_write_dsc_enable callback to
handle the MST case.

Use the drm_dp_mst_dsc_enable helper.

Cc: Wenjing Liu <Wenjing.Liu@xxxxxxx>
Cc: Nikola Cornij <Nikola.Cornij@xxxxxxx>
Signed-off-by: David Francis <David.Francis@xxxxxxx>
---
 .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c    | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index 716d6577cdbd..6ef680fa2875 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -38,6 +38,7 @@
 #include "dc.h"
 #include "amdgpu_dm.h"
 #include "amdgpu_dm_irq.h"
+#include "amdgpu_dm_mst_types.h"
 
 #include "dm_helpers.h"
 
@@ -557,8 +558,21 @@ bool dm_helpers_dp_write_dsc_enable(
 )
 {
 	uint8_t enable_dsc = enable ? 1 : 0;
+	struct amdgpu_dm_connector *aconnector;
+
+	if (!stream)
+		return false;
+
+	if (stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
+		aconnector = (struct amdgpu_dm_connector *)stream->dm_stream_context;
+
+		return (drm_dp_mst_dsc_enable(aconnector->port, enable) >= 0);
+	}
+
+	if (stream->signal == SIGNAL_TYPE_DISPLAY_PORT)
+		return dm_helpers_dp_write_dpcd(ctx, stream->link, DP_DSC_ENABLE, &enable_dsc, 1);
 
-	return dm_helpers_dp_write_dpcd(ctx, stream->sink->link, DP_DSC_ENABLE, &enable_dsc, 1);
+	return false;
 }
 #endif
 
-- 
2.17.1

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