drm/amd/display: Do not double-buffer DTO adjustments

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[WHY]
When changing DPP global ref clock, DTO adjustments must take effect
immediately, or else underflow may occur.
It appears the original decision to double-buffer DTO adjustments was made to
prevent underflows that occur when raising DPP ref clock (which is not
double-buffered), but that same decision causes similar issues when
lowering DPP global ref clock. The better solution is to order the
adjustments according to whether clocks are being raised or lowered.

Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Wesley Chalmers 2019-09-16 15:42:38 -05:00 • committed by Alex Deucher

parent 98bf2f5262

commit 6bd0a112ec

1 changed files with 0 additions and 26 deletions

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drivers/gpu/drm/amd/display/dc/dcn20/dcn20_dccg.c

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