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drm/i915: don't touch the PF regs if the power well is down

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This solves some "unclaimed register" messages when booting the
machine with eDP attached.

V2: Rebase and add the comment requested by Daniel.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni 2013-03-22 14:16:38 -03:00 committed by Daniel Vetter
parent 15d199ea1f
commit f7708f78bd
1 changed files with 7 additions and 3 deletions
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10
drivers/gpu/drm/i915/intel_display.c
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@ -3599,9 +3599,13 @@ static void haswell_crtc_disable(struct drm_crtc *crtc)
intel_ddi_disable_transcoder_func(dev_priv, cpu_transcoder);
/* Disable PF */
I915_WRITE(PF_CTL(pipe), 0);
I915_WRITE(PF_WIN_SZ(pipe), 0);
/* XXX: Once we have proper panel fitter state tracking implemented with
* hardware state read/check support we should switch to only disable
* the panel fitter when we know it's used. */
if (intel_using_power_well(dev)) {
I915_WRITE(PF_CTL(pipe), 0);
I915_WRITE(PF_WIN_SZ(pipe), 0);
}
intel_ddi_disable_pipe_clock(intel_crtc);