From: Tao <x...@amd.com>

Brightness couldn't change when booting up in DC mode.
It was because "psr_enabled" flag was not set to true before
setting vsc packet revision, causing packet rev setup was skipped.
Now instead of checking the psr flag, it checks if the DPCD_REV >= 1.2
and set the vsc packet revision.

Change-Id: I7a3f1f810e6c8263524356a3751be93e033f9202
Signed-off-by: Tao <x...@amd.com>
Reviewed-by: Tony Cheng <tony.ch...@amd.com>
Acked-by: Harry Wentland <harry.wentl...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c 
b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index a6f8c1f93693..ce0e9e76eb35 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -35,6 +35,7 @@
 #include "core_types.h"
 #include "set_mode_types.h"
 #include "virtual/virtual_stream_encoder.h"
+#include "dpcd_defs.h"
 
 #include "dce80/dce80_resource.h"
 #include "dce100/dce100_resource.h"
@@ -2434,7 +2435,8 @@ static void set_vsc_info_packet(
        unsigned int vscPacketRevision = 0;
        unsigned int i;
 
-       if (stream->sink->link->psr_enabled) {
+       /*VSC packet set to 2 when DP revision >= 1.2*/
+       if (stream->sink->link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_12) {
                vscPacketRevision = 2;
        }
 
-- 
2.14.1

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