| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.3 058/166] drm/amd/display: fix trigger not generated for freesync | Date | Sun, 6 Oct 2019 19:20:24 +0200 |
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From: Yogesh Mohan Marimuthu <yogesh.mohanmarimuthu@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.mohanmarimuthu@amd.com> Reviewed-by: Anthony Koo <Anthony.Koo@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@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 | 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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