If something, the usual suspect being bios, access hw
behind our back, dont let it slide into situation where
normal register access will detect this and spit out
a warn on into dmesg. On some bdw bioses this happens
during igt/bat run always and as there is not much we can
do about it, its better just to detect and flush this
explicitly on resume and only print a debug message.
v2: use DRM_DEBUG_DRIVER (Chris)
Testcase: igt/pm_rpm/basic-rte
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Paulo Zanoni <przanoni@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index e6935f1..eb6d8c5 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1477,6 +1477,9 @@ static int intel_runtime_suspend(struct device *device)
cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
intel_uncore_forcewake_reset(dev, false);
+ if (intel_uncore_unclaimed_access(dev))
+ DRM_ERROR("Unclaimed access detected prior suspending\n");
+
dev_priv->pm.suspended = true;
/*
@@ -1522,6 +1525,8 @@ static int intel_runtime_resume(struct device *device)
intel_opregion_notify_adapter(dev, PCI_D0);
dev_priv->pm.suspended = false;
+ if (intel_uncore_unclaimed_access(dev))
+ DRM_DEBUG_DRIVER("Unclaimed access during suspend, bios?\n");
intel_guc_resume(dev);
--
2.5.0
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