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drm/i915: Get PM ref before accessing HW register
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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1 changed files with 7 additions and 1 deletions
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@ -1969,8 +1969,14 @@ u32 intel_rps_read_actual_frequency(struct intel_rps *rps)
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u32 intel_rps_read_punit_req(struct intel_rps *rps)
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{
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struct intel_uncore *uncore = rps_to_uncore(rps);
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struct intel_runtime_pm *rpm = rps_to_uncore(rps)->rpm;
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intel_wakeref_t wakeref;
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u32 freq = 0;
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return intel_uncore_read(uncore, GEN6_RPNSWREQ);
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with_intel_runtime_pm_if_in_use(rpm, wakeref)
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freq = intel_uncore_read(uncore, GEN6_RPNSWREQ);
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return freq;
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}
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static u32 intel_rps_get_req(u32 pureq)
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