4.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tao <xtao@xxxxxxx>
[ Upstream commit 3b94a4007dcfd4ac5780cd3d8a2d99979c966073 ]
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.
Signed-off-by: Tao <xtao@xxxxxxx>
Reviewed-by: Tony Cheng <Tony.Cheng@xxxxxxx>
Acked-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- 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"
@@ -2428,7 +2429,8 @@ 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;
}
