[Bug 110394] Skylake GPU HANG while gstreamer H264 vaapi encoding from MJPEG vaapi decode on drm-tip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110394

--- Comment #32 from Andy Nicholas <andy.nicholas at shield.ai> ---
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?

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