drm/amd/display: add global master update lock for DCN2

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[why]
when an update programming sequence requires both
front end and back end pipe to be updated synchronously,
a global update lock needs to be set to ensure that
we don't get a frame with only front end update but
not the back end update.

[how]
setup global lock parameters on enable_stream_timing.
enable global lock when pipe_control_lock_global is called.
disable global lock when pipe_control_lock is called.

Signed-off-by: Wenjing Liu <Wenjing.Liu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Wenjing Liu 2019-03-05 19:28:10 -05:00 • committed by Alex Deucher

parent 64f223b0dd

commit 6c5be4ac63

5 changed files with 72 additions and 1 deletions

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4

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

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63

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_optc.c

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3

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_optc.h

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2

drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h

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1

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

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