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
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3599,9 +3599,13 @@
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);