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drm/i915: clarify IBX dp workaround 

Instead of checking for !CPT, check for IBX to make it clearer that
this is a IBX-specific workaround. No functional change because we
smash the PPT PCH into the HAS_PCH_CPT check and atm DP isn't enabled
on the haswell LPT PCH yet.

See Bspec Vol 3, Part 3, Section 4.[3-5].1 about DP[BCD], bit 30 for
details of this workaround.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-05-30 12:31:56 +02:00
parent e269f90f3d
commit 493a708179
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_dp.c
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@ -1914,7 +1914,7 @@ intel_dp_link_down(struct intel_dp *intel_dp)
DP |= DP_LINK_TRAIN_OFF;
}
if (!HAS_PCH_CPT(dev) &&
if (HAS_PCH_IBX(dev) &&
I915_READ(intel_dp->output_reg) & DP_PIPEB_SELECT) {
struct drm_crtc *crtc = intel_dp->base.base.crtc;