drm/amd/display: implement T12 compliance

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[why]
When OS reboots, and panel is turned off, T12 may not be maintained.
T12 is defined as the interval between VDDC off (occurs at shutdown) and
the next VDDC on (occurs when eDP is POST-ed)

[how]
DC already tracks panel power off time.  Add a DC interface which DM can
call during shutdown.  Ideally this should be as late as possible during
the shutdown sequence so the extra delay is minimal.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Jun Lei <jun.lei@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Jun Lei 2020-11-24 11:58:19 -05:00 • committed by Alex Deucher

parent ea0124a7d2

commit cf3a262759

6 changed files with 53 additions and 0 deletions

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11

drivers/gpu/drm/amd/display/dc/core/dc_link.c

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7

drivers/gpu/drm/amd/display/dc/dc_link.h

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31

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

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2

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.h

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1

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_init.c

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1

drivers/gpu/drm/amd/display/dc/inc/hw_sequencer.h

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