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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Skylake GPU HANG while gstreamer H264 vaapi encoding from MJPEG vaapi decode on drm-tip"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110394#c32">Comment # 32</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Skylake GPU HANG while gstreamer H264 vaapi encoding from MJPEG vaapi decode on drm-tip"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110394">bug 110394</a>
from <span class="vcard"><a class="email" href="mailto:andy.nicholas@shield.ai" title="Andy Nicholas <andy.nicholas@shield.ai>"> <span class="fn">Andy Nicholas</span></a>
</span></b>
<pre>This is the diff for the powergating test I'm running now. No other changes are
made to the kernel, just this one patch:
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index eaf0793ebf60..29260ba32529 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8609,8 +8609,12 @@ static void intel_enable_rc6(struct drm_i915_private
*dev_priv)
cherryview_enable_rc6(dev_priv);
else if (IS_VALLEYVIEW(dev_priv))
valleyview_enable_rc6(dev_priv);
- else if (INTEL_GEN(dev_priv) >= 9)
- gen9_enable_rc6(dev_priv);
+ else if (INTEL_GEN(dev_priv) >= 9) {
+ gen9_disable_rc6(dev_priv);
+
+ I915_WRITE(GEN9_PG_ENABLE,
+ GEN9_RENDER_PG_ENABLE | GEN9_MEDIA_PG_ENABLE);
+ }
else if (IS_BROADWELL(dev_priv))
gen8_enable_rc6(dev_priv);
else if (INTEL_GEN(dev_priv) >= 6)
Btw -
I did read through the gen9_enable_rc6() code and the "hysteresis" stuff jumped
out at me. does anything bad happen if those calculations are not accurate?</pre>
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