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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BAT SKL] GPU death starting with first symptom: WARNING backtrace: "DC6 already programmed to be enabled.""
href="https://bugs.freedesktop.org/show_bug.cgi?id=93768#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BAT SKL] GPU death starting with first symptom: WARNING backtrace: "DC6 already programmed to be enabled.""
href="https://bugs.freedesktop.org/show_bug.cgi?id=93768">bug 93768</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
b/drivers/gpu/drm/i915/inte
index bbca527..a90d4d0 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -497,7 +497,8 @@ static void gen9_set_dc_state(struct drm_i915_private
*dev_p
val &= ~mask;
val |= state;
I915_WRITE(DC_STATE_EN, val);
- POSTING_READ(DC_STATE_EN);
+ if (wait_for((I915_READ(DC_STATE_EN) & mask) == state, 500))
+ DRM_ERROR("Timeout whilst enabling DC6\n");
}
void bxt_enable_dc9(struct drm_i915_private *dev_priv)</pre>
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