[PATCH 3/3] drm/i915: clear the FPGA_DBG_RM_NOCLAIM bit at driver init

[Paulo Zanoni <przanoni@gmail.com>]

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

Otherwise, if the BIOS did anything wrong, our first I915_{WRITE,READ}
will give us "unclaimed register"  messages.

V2: Even earlier.

Bugzilla: http://bugs.freedesktop.org/show_bug.cgi?id=58897
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/i915_dma.c |    4 ++++
 1 file changed, 4 insertions(+)

If no one is opposed, I'd like to suggest applying patches 1-3 from this series
first, then we worry about the others later.

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index cf06103..d295445 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1542,6 +1542,10 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 		goto put_gmch;
 	}
 
+	/* This must happen before any I915_{READ,WRITE}: */
+	if (IS_HASWELL(dev))
+		I915_WRITE_NOTRACE(FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
+
 	aperture_size = dev_priv->gtt.mappable_end;
 
 	dev_priv->gtt.mappable =
-- 
1.7.10.4