From 0f92f2b38ed5d2f9eeb0e63a20c3c6fdd9974586 Mon Sep 17 00:00:00 2001
From: Aric Cyr <aric.cyr@amd.com>
Date: Thu, 23 Jul 2020 13:06:23 -0400
Subject: drm/amd/display: AMD OUI (DPCD 0x00300) skipped on some sink
Git-commit: e106c96e2e0a0b9c1305d54480b60cb670d7fd1b
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]
Sink OUI supported cap is not set so driver skips programming it.

[How]
Revert the change the skips OUI programming if the cap is not set

Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 16 ----------------
 1 file changed, 16 deletions(-)

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 d7d2dcd49c06..9bc03f26efda 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
@@ -4339,22 +4339,6 @@ void dp_set_fec_enable(struct dc_link *link, bool enable)
 
 void dpcd_set_source_specific_data(struct dc_link *link)
 {
-	uint8_t dspc = 0;
-	enum dc_status ret;
-
-	ret = core_link_read_dpcd(link, DP_DOWN_STREAM_PORT_COUNT, &dspc,
-				  sizeof(dspc));
-
-	if (ret != DC_OK) {
-		DC_LOG_ERROR("Error in DP aux read transaction,"
-			     " not writing source specific data\n");
-		return;
-	}
-
-	/* Return if OUI unsupported */
-	if (!(dspc & DP_OUI_SUPPORT))
-		return;
-
 	if (!link->dc->vendor_signature.is_valid) {
 		struct dpcd_amd_signature amd_signature;
 		amd_signature.AMD_IEEE_TxSignature_byte1 = 0x0;
-- 
2.29.2