4.16-stable review patch. If anyone has any objections, please let me know.
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From: Tao xtao@amd.com
[ 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@amd.com Reviewed-by: Tony Cheng Tony.Cheng@amd.com Acked-by: Harry Wentland harry.wentland@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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; }