From: Yogesh Mohan Marimuthu <yogesh.mohanmarimuthu@xxxxxxx> [ 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@xxxxxxx> Reviewed-by: Anthony Koo <Anthony.Koo@xxxxxxx> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
