drm/i915: Get PM ref before accessing HW register

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Seeing these errors when GT is likely in suspend state-
"RPM wakelock ref not held during HW access"

Ensure GT is awake before trying to access HW registers. Avoid
reading the register if that is not the case.

Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Fixes: 41e5c17ebf ("drm/i915/guc/slpc: Sysfs hooks for SLPC")
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210907232704.12982-1-vinay.belgaumkar@intel.com

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Vinay Belgaumkar 2021-09-07 16:27:04 -07:00 • committed by John Harrison

parent 74388ca483

commit f25e3908b9

1 changed files with 7 additions and 1 deletions

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

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