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

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>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 236d268..51871c2 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -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);