diff options
| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2020-01-14 10:56:48 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2020-01-14 12:55:13 +0000 |
| commit | e88e9f8ea4e95df6e76ce6721e93524d3d116705 (patch) | |
| tree | bfd01f22c84b9d6367238ae1c637146f9b6f884f | |
| parent | drm/i915/pmu: Correct the rc6 offset upon enabling (diff) | |
drm/i915/gt: Clear rc6 residency trackers across suspend
On suspend, the rc6 residency counters (stored in HW registers) will be
lost and cleared. However, we keep track of the rc6 residency to provide
a continuous 64b sampling, and if we see the HW value go backwards, we
assume it overflowed and add on 32b/40b -- an interesting artifact when
sampling across suspend.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200114105648.2172026-2-chris@chris-wilson.co.uk
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_rc6.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c index 9e303c29d6e3..04eeb7740e53 100644 --- a/drivers/gpu/drm/i915/gt/intel_rc6.c +++ b/drivers/gpu/drm/i915/gt/intel_rc6.c @@ -542,6 +542,8 @@ void intel_rc6_init(struct intel_rc6 *rc6) void intel_rc6_sanitize(struct intel_rc6 *rc6) { + memset(rc6->prev_hw_residency, 0, sizeof(rc6->prev_hw_residency)); + if (rc6->enabled) { /* unbalanced suspend/resume */ rpm_get(rc6); rc6->enabled = false; |