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drm/i915: properly clear SSC1 bit in the pch refclock init code 

Noticed by staring at intel_reg_dumper diffs. Unfortunately it does
not seem to completely fix the bug.

Still, it's good to get this right, and maybe it helps someplace else.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=47117
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-03-30 22:14:05 +02:00
parent 1c7eaac737
commit e77166b5a6
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/intel_display.c
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@ -5539,7 +5539,8 @@ void ironlake_init_pch_refclk(struct drm_device *dev)
if (intel_panel_use_ssc(dev_priv) && can_ssc) {
DRM_DEBUG_KMS("Using SSC on panel\n");
temp |= DREF_SSC1_ENABLE;
}
} else
temp &= ~DREF_SSC1_ENABLE;
/* Get SSC going before enabling the outputs */
I915_WRITE(PCH_DREF_CONTROL, temp);