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drm/i915: clear the FPGA_DBG_RM_NOCLAIM bit at driver init

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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.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni 2013-02-19 16:13:35 -03:00 committed by Daniel Vetter
parent 3f1e109a8b
commit 02bcca0d72
1 changed files with 18 additions and 0 deletions
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18
drivers/gpu/drm/i915/i915_dma.c
View file

@ -1452,6 +1452,22 @@ static void i915_dump_device_info(struct drm_i915_private *dev_priv)
#undef DEV_INFO_SEP
}
/**
* 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
@ -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 =