From: Paulo Zanoni <paulo.r.zan...@intel.com>
Otherwise, if the BIOS did anything wrong, our first I915_{WRITE,READ}
will give us "unclaimed register" messages.
V2: Even earlier.
V3: Move it to intel_early_sanitize_regs.
Bugzilla: http://bugs.freedesktop.org/show_bug.cgi?id=58897
Signed-off-by: Paulo Zanoni <paulo.r.zan...@intel.com>
---
drivers/gpu/drm/i915/i915_dma.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 4fa6beb..e16099b 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1453,6 +1453,22 @@ static void i915_dump_device_info(struct
drm_i915_private *dev_priv)
}
/**
+ * intel_early_sanitize_regs - clean up BIOS state
+ * @dev: DRM device
+ *
+ * This function must be called before we do any I915_READ or I915_WRITE. Its
+ * purpose is to clean up any state left by the BIOS that may affect us when
+ * reading and/or writing registers.
+ */
+static void intel_early_sanitize_regs(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (IS_HASWELL(dev))
+ I915_WRITE_NOTRACE(FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
+}
+
+/**
* i915_driver_load - setup chip and create an initial config
* @dev: DRM device
* @flags: startup flags
@@ -1542,6 +1558,8 @@ int i915_driver_load(struct drm_device *dev, unsigned
long flags)
goto put_gmch;
}
+ intel_early_sanitize_regs(dev);
+
aperture_size = dev_priv->gtt.mappable_end;
dev_priv->gtt.mappable =
--
1.7.10.4
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