From 03ef7c1412784287d4353c5bc8852f411e27c34f Mon Sep 17 00:00:00 2001
From: Derek Lai <Derek.Lai@amd.com>
Date: Thu, 4 Jun 2020 16:29:39 +0800
Subject: drm/amd/display: VSC SDP supported for SST
Git-commit: 7715fdf3362fa88f3e3620261a6e546f50713a5e
Patch-mainline: v5.9-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

[why]
If a typeC to HDMI dongle supports YCbCr420 pass through and VSC
colorimetry and pixel encoding formats in the Extended Receiver
Capability, we shall allow VSC SDP to be used.

[How]
The Extended Receiver Capability field shall check the
EXTENDED_RECEIVER_CAPABILITY_FIELD_PRESENT bit in the
TRAINING_AUX_RD_INTERVAL register.  Removed DPCD rev checking for VSC
SDP.

Signed-off-by: Derek Lai <Derek.Lai@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Tony Cheng <Tony.Cheng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 +---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c  | 2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index cd8a43c7f7fa..1de9976da4bc 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4587,10 +4587,8 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
 				stream->use_vsc_sdp_for_colorimetry =
 					aconnector->dc_sink->is_vsc_sdp_colorimetry_supported;
 			} else {
-				if (stream->link->dpcd_caps.dpcd_rev.raw >= 0x14 &&
-					stream->link->dpcd_caps.dprx_feature.bits.VSC_SDP_COLORIMETRY_SUPPORTED) {
+				if (stream->link->dpcd_caps.dprx_feature.bits.VSC_SDP_COLORIMETRY_SUPPORTED)
 					stream->use_vsc_sdp_for_colorimetry = true;
-				}
 			}
 			mod_build_vsc_infopacket(stream, &stream->vsc_infopacket);
 		}
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index baad087c4f71..4054df1cd1a5 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -3376,7 +3376,7 @@ static bool retrieve_link_cap(struct dc_link *link)
 	link->dpcd_caps.dpcd_rev.raw =
 			dpcd_data[DP_DPCD_REV - DP_DPCD_REV];
 
-	if (link->dpcd_caps.dpcd_rev.raw >= 0x14) {
+	if (link->dpcd_caps.ext_receiver_cap_field_present) {
 		for (i = 0; i < read_dpcd_retry_cnt; i++) {
 			status = core_link_read_dpcd(
 					link,
-- 
2.29.2