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drm/amd/display: fix trigger not generated for freesync

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[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>
This commit is contained in:
Yogesh Mohan Marimuthu
2019-08-02 10:52:49 +05:30
committed by Alex Deucher
parent 436d96357f
commit 1e7f100ce8
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
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@ -825,6 +825,9 @@ 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);
}