[Intel-gfx] [PATCH 4/7] drm/i915: don't touch the PF regs if the power well is down

[Paulo Zanoni]

From: Paulo Zanoni <paulo.r.zanoni at intel.com>

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 at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index be70f2d..36e0445 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3594,9 +3594,13 @@ 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);
 
-- 
1.7.10.4