From 53aa484893afe71e12b9e73cf75389cfc74ae314 Mon Sep 17 00:00:00 2001
From: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date: Thu, 18 Apr 2013 16:35:40 -0300
Subject: drm/i915: check the power well inside haswell_get_pipe_config

This fixes "unclaimed register" messages when booting with eDP only
and i915.disable_power_well=1.

The error messages were caused by:

  commit 0e8ffe1bf81b0780cc6229cb38664754dffe8776
  Author: Daniel Vetter <daniel.vetter@ffwll.ch>
  Date:   Thu Mar 28 10:42:00 2013 +0100
      drm/i915: add hw state readout/checking for pipe_config

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
(cherry picked from commit 2bfce95075fa58eaf2ead5b0863c50a3f6098bc2)
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 212fb82e0f31..f81c1fce9621 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5990,9 +5990,14 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
 {
 	struct drm_device *dev = crtc->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	enum transcoder cpu_transcoder = crtc->config.cpu_transcoder;
 	uint32_t tmp;
 
-	tmp = I915_READ(PIPECONF(crtc->config.cpu_transcoder));
+	if (!intel_using_power_well(dev_priv->dev) &&
+	    cpu_transcoder != TRANSCODER_EDP)
+		return false;
+
+	tmp = I915_READ(PIPECONF(cpu_transcoder));
 	if (!(tmp & PIPECONF_ENABLE))
 		return false;
 
-- 
1.8.5.rc3