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 <ch...@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuopp...@intel.com>
---
drivers/gpu/drm/i915/intel_uncore.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c
b/drivers/gpu/drm/i915/intel_uncore.c
index 8f5bc86..8649f1c 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -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);
--
1.7.9.5
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