drm/i915: Add Wa_22011802037 force cs halt

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Prior to doing a reset, SW must ensure command streamer is stopped,
as a workaround, to eliminate a race condition in GPM flow.
Setting both the ring stop and prefetch disable bits, will cause the
command streamer to halt.

Signed-off-by: Tilak Tangudu <tilak.tangudu@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220415224025.3693037-2-umesh.nerlige.ramappa@intel.com

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Tilak Tangudu 2022-04-15 15:40:20 -07:00 • committed by John Harrison

parent bcfc713f11

commit f6aa0d713c

2 changed files with 10 additions and 0 deletions

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9

drivers/gpu/drm/i915/gt/intel_engine_cs.c

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1

drivers/gpu/drm/i915/gt/intel_engine_regs.h

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