Merge commit 'Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux'

[linux-drm-fsl-dcu.git] / drivers / gpu / drm / i915 / intel_pm.c

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index e81d37667bc9f15afe8a086b64e1dbf8b29e1180..74d6c4d78360adba17dfd38aee662f4a75277cf5 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5473,7 +5473,7 @@ static void vlv_force_wake_put(struct drm_i915_private *dev_priv)
        gen6_gt_check_fifodbg(dev_priv);
 }
 
-void intel_gt_reset(struct drm_device *dev)
+void intel_gt_sanitize(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
 
@@ -5484,22 +5484,51 @@ void intel_gt_reset(struct drm_device *dev)
                if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
                        __gen6_gt_force_wake_mt_reset(dev_priv);
        }
+
+       /* BIOS often leaves RC6 enabled, but disable it for hw init */
+       if (INTEL_INFO(dev)->gen >= 6)
+               intel_disable_gt_powersave(dev);
 }
 
 void intel_gt_init(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
 
-       spin_lock_init(&dev_priv->gt_lock);
-
-       intel_gt_reset(dev);
-
        if (IS_VALLEYVIEW(dev)) {
                dev_priv->gt.force_wake_get = vlv_force_wake_get;
                dev_priv->gt.force_wake_put = vlv_force_wake_put;
-       } else if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev)) {
+       } else if (IS_HASWELL(dev)) {
                dev_priv->gt.force_wake_get = __gen6_gt_force_wake_mt_get;
                dev_priv->gt.force_wake_put = __gen6_gt_force_wake_mt_put;
+       } else if (IS_IVYBRIDGE(dev)) {
+               u32 ecobus;
+
+               /* IVB configs may use multi-threaded forcewake */
+
+               /* A small trick here - if the bios hasn't configured
+                * MT forcewake, and if the device is in RC6, then
+                * force_wake_mt_get will not wake the device and the
+                * ECOBUS read will return zero. Which will be
+                * (correctly) interpreted by the test below as MT
+                * forcewake being disabled.
+                */
+               mutex_lock(&dev->struct_mutex);
+               __gen6_gt_force_wake_mt_get(dev_priv);
+               ecobus = I915_READ_NOTRACE(ECOBUS);
+               __gen6_gt_force_wake_mt_put(dev_priv);
+               mutex_unlock(&dev->struct_mutex);
+
+               if (ecobus & FORCEWAKE_MT_ENABLE) {
+                       dev_priv->gt.force_wake_get =
+                                               __gen6_gt_force_wake_mt_get;
+                       dev_priv->gt.force_wake_put =
+                                               __gen6_gt_force_wake_mt_put;
+               } else {
+                       DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n");
+                       DRM_INFO("when using vblank-synced partial screen updates.\n");
+                       dev_priv->gt.force_wake_get = __gen6_gt_force_wake_get;
+                       dev_priv->gt.force_wake_put = __gen6_gt_force_wake_put;
+               }
        } else if (IS_GEN6(dev)) {
                dev_priv->gt.force_wake_get = __gen6_gt_force_wake_get;
                dev_priv->gt.force_wake_put = __gen6_gt_force_wake_put;