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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [SNB regression] Power consumption goes postal after resume"
href="https://bugs.freedesktop.org/show_bug.cgi?id=54089#c70">Comment # 70</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [SNB regression] Power consumption goes postal after resume"
href="https://bugs.freedesktop.org/show_bug.cgi?id=54089">bug 54089</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>Can you please try this:
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7756668..12a9d9c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4551,6 +4551,7 @@ static void gen6_init_clock_gating(struct drm_device
*dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t dspclk_gate = ILK_VRHUNIT_CLOCK_GATE_DISABLE;
+ u32 tmp;
I915_WRITE(ILK_DSPCLK_GATE_D, dspclk_gate);
@@ -4622,8 +4623,11 @@ static void gen6_init_clock_gating(struct drm_device
*dev)
ILK_DPFDUNIT_CLOCK_GATE_ENABLE);
/* WaMbcDriverBootEnable:snb */
- I915_WRITE(GEN6_MBCTL, I915_READ(GEN6_MBCTL) |
- GEN6_MBCTL_ENABLE_BOOT_FETCH);
+ tmp = I915_READ(GEN6_MBCTL);
+ I915_WRITE(GEN6_MBCTL, tmp | GEN6_MBCTL_ENABLE_BOOT_FETCH);
+ POSTING_READ(GEN6_MBCTL);
+ usleep(100);
+ I915_WRITE(GEN6_MBCTL, tmp & ~GEN6_MBCTL_ENABLE_BOOT_FETCH);
g4x_disable_trickle_feed(dev);</pre>
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