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>

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 8f5bc86..8649f1c 100644 (file)
--- 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);