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drm/i915: sanitize forcewake registers on reset 

In reset we try to restore the forcewake state to
pre reset state, using forcewake_count. The reset
doesn't seem to clear the forcewake bits so we
get warn on forcewake ack register not clearing.

Use same mechanism as intel_uncore_sanitize() does
when loading driver to reset the forcewake bits, right
after the chip has been reset.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Mika Kuoppala 2013-08-23 16:52:30 +03:00 committed by Daniel Vetter
parent a9c1f90c8e
commit 521198a2e7
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/i915/intel_uncore.c
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@ -261,7 +261,7 @@ void intel_uncore_init(struct drm_device *dev)
}
}
void intel_uncore_sanitize(struct drm_device *dev)
static void intel_uncore_forcewake_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -272,6 +272,11 @@ void intel_uncore_sanitize(struct drm_device *dev)
if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
__gen6_gt_force_wake_mt_reset(dev_priv);
}
}
void intel_uncore_sanitize(struct drm_device *dev)
{
intel_uncore_forcewake_reset(dev);
/* BIOS often leaves RC6 enabled, but disable it for hw init */
intel_disable_gt_powersave(dev);
@ -549,6 +554,8 @@ static int gen6_do_reset(struct drm_device *dev)
/* Spin waiting for the device to ack the reset request */
ret = wait_for((__raw_i915_read32(dev_priv, GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);
intel_uncore_forcewake_reset(dev);
/* If reset with a user forcewake, try to restore, otherwise turn it off */
if (dev_priv->uncore.forcewake_count)
dev_priv->uncore.funcs.force_wake_get(dev_priv);