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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [BYT Regression]igt/gem_concurrent_blit/gtt-gpu-read-after-write-forked causes *ERROR* timed out waiting for Punit"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75244#c20">Comment # 20</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [BYT Regression]igt/gem_concurrent_blit/gtt-gpu-read-after-write-forked causes *ERROR* timed out waiting for Punit"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75244">bug 75244</a>
from <span class="vcard"><a class="email" href="mailto:huax.lu@intel.com" title="lu hua <huax.lu@intel.com>"> <span class="fn">lu hua</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=102457" name="attach_102457" title="dmesg">attachment 102457</a> <a href="attachment.cgi?id=102457&action=edit" title="dmesg">[details]</a></span>
dmesg
<span class="quote">>
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c
> b/drivers/gpu/drm/i915/intel_pm.c
> index 0115689..1fea122 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3254,18 +3254,18 @@ static void vlv_set_rps_idle(struct drm_i915_private
> *dev_priv)
> /* Mask turbo interrupt so that they will not come in between */
> I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
>
> - vlv_force_gfx_clock(dev_priv, true);
> -
> dev_priv->rps.cur_freq = dev_priv->rps.min_freq_softlimit;
>
> + gen6_gt_force_wake_get(dev_priv, FORCEWAKE_ALL);
> +
> vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ,
> dev_priv->rps.min_freq_softlimit);
>
> if (wait_for(((vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS))
> - & GENFREQSTATUS) == 0, 5))
> + & GENFREQSTATUS) == 0, 10))
> DRM_ERROR("timed out waiting for Punit\n");
>
> - vlv_force_gfx_clock(dev_priv, false);
> + gen6_gt_force_wake_put(dev_priv, FORCEWAKE_ALL);
>
> I915_WRITE(GEN6_PMINTRMSK,
> gen6_rps_pm_mask(dev_priv, dev_priv->rps.cur_freq));</span >
Test this patch, it still exists.</pre>
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