drm/i915: restore the early forcewake cleanup

commit ef46e0d247da0a7a408573aa15870e231bbd4af2 upstream.

Some BIOS just leak the forcewak bits, which we clean up.
Unfortunately this has been broken in

commit 521198a2e7095c8c7daa8d7d3a76a110c346be6f
Author: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Date:   Fri Aug 23 16:52:30 2013 +0300

    drm/i915: sanitize forcewake registers on reset

To make this work both for resets and for BIOS takeover just add the
forcewake clearing call back to intel_uncore_early_sanitize.

We need to clear the forcewake in early sanitize so that the forcewak
dance in intel_uncore_init (to figure out whether we have mt or legacy
forcewake on ivb) works. That cleanup fits in nicely with the general
topic of early_sanitize to prepare for the very first mmio ops.

Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reported-by: Jörg Otte <jrg.otte@gmail.com>
Cc: Jörg Otte <jrg.otte@gmail.com>
References: https://lkml.org/lkml/2013/11/16/40
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 8649f1c..ee7d649 100644 (file)
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -204,6 +204,19 @@ static void vlv_force_wake_put(struct drm_i915_private *dev_priv)
        gen6_gt_check_fifodbg(dev_priv);
 }
 
+static void intel_uncore_forcewake_reset(struct drm_device *dev)
+{
+       struct drm_i915_private *dev_priv = dev->dev_private;
+
+       if (IS_VALLEYVIEW(dev)) {
+               vlv_force_wake_reset(dev_priv);
+       } else if (INTEL_INFO(dev)->gen >= 6) {
+               __gen6_gt_force_wake_reset(dev_priv);
+               if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
+                       __gen6_gt_force_wake_mt_reset(dev_priv);
+       }
+}
+
 void intel_uncore_early_sanitize(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
@@ -259,19 +272,8 @@ void intel_uncore_init(struct drm_device *dev)
                dev_priv->uncore.funcs.force_wake_put =
                        __gen6_gt_force_wake_put;
        }
-}
 
-static void intel_uncore_forcewake_reset(struct drm_device *dev)
-{
-       struct drm_i915_private *dev_priv = dev->dev_private;
-
-       if (IS_VALLEYVIEW(dev)) {
-               vlv_force_wake_reset(dev_priv);
-       } else if (INTEL_INFO(dev)->gen >= 6) {
-               __gen6_gt_force_wake_reset(dev_priv);
-               if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
-                       __gen6_gt_force_wake_mt_reset(dev_priv);
-       }
+       intel_uncore_forcewake_reset(dev);
 }
 
 void intel_uncore_sanitize(struct drm_device *dev)