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Commit 567689a4 authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Daniel Vetter
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drm/i915: Don't set persistent FBC mode on ILK/SNB 



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: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent b339088d

drivers/gpu/drm/i915/intel_pm.c

+0 −2
Original line number Diff line number Diff line
@@ -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;