drm/amd/display: Add double buffering to dcn20 OCSC

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[Why]
When rapidly adjusting colour properties (e.g. brightness), screen tearing was observed.
This was due to overwritten values in OCSC registers. In dcn10, this issue had been fixed by
implementing double buffering by alternating OCSC modes.

[How]
Alternate which OCSC registers are used by switching modes each time.
This double buffers the CSC writes.

Signed-off-by: Noah Abradjian <noah.abradjian@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Noah Abradjian 2019-12-11 13:34:04 -05:00 • committed by Alex Deucher

parent 1295524e6f

commit e8027e0884

4 changed files with 59 additions and 6 deletions

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45

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.c

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16

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_mpc.h

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1

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

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3

drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c

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