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drm/amd/display: clear optc underflow before turn off odm clock

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[Why]
After ODM clock off, optc underflow bit will be kept there always and clear not work.
We need to clear that before clock off.

[How]
Clear that if have when clock off.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Fudong Wang <Fudong.Wang@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Fudong Wang 2022-07-27 12:01:29 +08:00 committed by Alex Deucher
parent f0068dd0ef
commit b2a9349020
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c
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@ -465,6 +465,11 @@ void optc1_enable_optc_clock(struct timing_generator *optc, bool enable)
OTG_CLOCK_ON, 1,
1, 1000);
} else {
//last chance to clear underflow, otherwise, it will always there due to clock is off.
if (optc->funcs->is_optc_underflow_occurred(optc) == true)
optc->funcs->clear_optc_underflow(optc);
REG_UPDATE_2(OTG_CLOCK_CONTROL,
OTG_CLOCK_GATE_DIS, 0,
OTG_CLOCK_EN, 0);