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drm/i915: Don't set persistent FBC mode on ILK/SNB

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The ILK/SNB docs are a bit unclear what the persistent mode does, but
the CTG docs clearly state that it was meant to be used when we're
tracking back buffer modifications. We never do that, so leave it in
non-persistent mode.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-01-23 16:49:09 +02:00 committed by Daniel Vetter
parent b339088d81
commit 567689a4a9
1 changed files with 0 additions and 2 deletions
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2
drivers/gpu/drm/i915/intel_pm.c
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@ -230,8 +230,6 @@ static void ironlake_enable_fbc(struct drm_crtc *crtc)
dpfc_ctl = I915_READ(ILK_DPFC_CONTROL);
dpfc_ctl &= DPFC_RESERVED;
dpfc_ctl |= (plane | DPFC_CTL_LIMIT_1X);
/* Set persistent mode for front-buffer rendering, ala X. */
dpfc_ctl |= DPFC_CTL_PERSISTENT_MODE;
dpfc_ctl |= DPFC_CTL_FENCE_EN;
if (IS_GEN5(dev))
dpfc_ctl |= obj->fence_reg;