patches.baytrail/0742-drm-i915-sanitize-forcewake-registers-on-reset.patch

From 8a90bc85114de48f9ac89480394179a6397ff7b4 Mon Sep 17 00:00:00 2001
From: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Date: Fri, 23 Aug 2013 16:52:30 +0300
Subject: 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>
(cherry picked from commit 521198a2e7095c8c7daa8d7d3a76a110c346be6f)
Signed-off-by: Darren Hart <dvhart@linux.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 8f5bc869c023..8649f1c36b00 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);
-- 
1.8.5.rc3