[PATCH 070/241] drm/vmwgfx: Fix hibernation device reset

[Herton Ronaldo Krzesinski]

3.5.7.2 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Hellstrom <thellstrom at vmware.com>

commit 95e8f6a21996c4cc2c4574b231c6e858b749dce3 upstream.

The device would not reset properly when resuming from hibernation.

Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
Reviewed-by: Brian Paul <brianp at vmware.com>
Reviewed-by: Dmitry Torokhov <dtor at vmware.com>
Cc: linux-graphics-maintainer at vmware.com
Signed-off-by: Dave Airlie <airlied at redhat.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 3a4b15a..db50604 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -1102,6 +1102,11 @@ static void vmw_pm_complete(struct device *kdev)
 	struct drm_device *dev = pci_get_drvdata(pdev);
 	struct vmw_private *dev_priv = vmw_priv(dev);
 
+	mutex_lock(&dev_priv->hw_mutex);
+	vmw_write(dev_priv, SVGA_REG_ID, SVGA_ID_2);
+	(void) vmw_read(dev_priv, SVGA_REG_ID);
+	mutex_unlock(&dev_priv->hw_mutex);
+
 	/**
 	 * Reclaim 3d reference held by fbdev and potentially
 	 * start fifo.
-- 
1.7.9.5