[PATCH AUTOSEL 5.4 026/108] drm/amd/display: writing stereo polarity register if swapped

Sasha Levin
2020-04-11T23:10:20Z

From: Martin Leung <martin.leung@amd.com>

[ Upstream commit e592e85f3378246dd66b861fa60ef803d8cece6b ]

[why]
on some displays that prefer swapped polarity we were seeing L/R images
swapped because OTG_STEREO_SYNC_OUTPUT_POLARITY would always be mapped
to 0

[how]
fix initial dal3 implementation to properly update the polarity field
according to the crtc_stereo_flags (same as
OTG_STEREO_EYE_FLAG_POLARITY)

Signed-off-by: Martin Leung <martin.leung@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
index e74a07d03fde9..5fda5824f2669 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
@@ -1185,7 +1185,7 @@ static void optc1_enable_stereo(struct timing_generator *optc,
REG_UPDATE_3(OTG_STEREO_CONTROL,
OTG_STEREO_EN, stereo_en,
OTG_STEREO_SYNC_OUTPUT_LINE_NUM, 0,
- OTG_STEREO_SYNC_OUTPUT_POLARITY, 0);
+ OTG_STEREO_SYNC_OUTPUT_POLARITY, flags->RIGHT_EYE_POLARITY == 0 ? 0 : 1);

if (flags->PROGRAM_POLARITY)
REG_UPDATE(OTG_STEREO_CONTROL,
--
2.20.1