From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
We use GT parked status to estimate RC6 while not in use, however if RC6
is not supported to start with that does not work very well and produces a
false 100% RC6 readout.
Fix by not advancing the estimated RC6 counter when feature is not
supported.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Fixes: 1fe699e30113 ("drm/i915/pmu: Fix sleep under atomic in RC6 readout")
Reported-by: Eero T Tamminen <eero.t.tamminen@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_pmu.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 41651ac255fa..02fe0d22c470 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -191,7 +191,10 @@ static u64 get_rc6(struct intel_gt *gt)
* on top of the last known real value, as the approximated RC6
* counter value.
*/
- val = ktime_since_raw(pmu->sleep_last);
+ if (gt->rc6.supported)
+ val = ktime_since_raw(pmu->sleep_last);
+ else
+ val = 0;
val += pmu->sample[__I915_SAMPLE_RC6].cur;
}
--
2.27.0
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