From: Yogesh Mohan Marimuthu <yogesh.mohanmarimu...@amd.com>
[ Upstream commit 1e7f100ce8c0640634b794604880d9204480c9f1 ]
[Why]
In newer hardware MANUAL_FLOW_CONTROL is not a trigger bit. Due to this
front porch is fixed and in these hardware freesync does not work.
[How]
Change the programming to generate a pulse so that the event will be
triggered, front porch will be cut short and freesync will work.
Signed-off-by: Yogesh Mohan Marimuthu <yogesh.mohanmarimu...@amd.com>
Reviewed-by: Anthony Koo <anthony....@amd.com>
Acked-by: Bhawanpreet Lakha <bhawanpreet.la...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c | 3 +++
1 file changed, 3 insertions(+)
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 a546c2bc9129c..e365f2dd7f9a9 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
@@ -824,6 +824,9 @@ void optc1_program_manual_trigger(struct timing_generator
*optc)
REG_SET(OTG_MANUAL_FLOW_CONTROL, 0,
MANUAL_FLOW_CONTROL, 1);
+
+ REG_SET(OTG_MANUAL_FLOW_CONTROL, 0,
+ MANUAL_FLOW_CONTROL, 0);
}
--
2.20.1
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