linux-kernel - [ 50/57] drm/vmwgfx: Fix hibernation device reset

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Message-Id: <20121115040936.215059445@linuxfoundation.org>
Date:	Wed, 14 Nov 2012 20:11:58 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Thomas Hellstrom <thellstrom@...are.com>,
	Brian Paul <brianp@...are.com>,
	Dmitry Torokhov <dtor@...are.com>,
	Dave Airlie <airlied@...hat.com>,
	linux-graphics-maintainer@...are.com
Subject: [ 50/57] drm/vmwgfx: Fix hibernation device reset

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

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

From: Thomas Hellstrom <thellstrom@...are.com>

commit 95e8f6a21996c4cc2c4574b231c6e858b749dce3 upstream.

The device would not reset properly when resuming from hibernation.

Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Reviewed-by: Brian Paul <brianp@...are.com>
Reviewed-by: Dmitry Torokhov <dtor@...are.com>
Cc: linux-graphics-maintainer@...are.com
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c |    5 +++++
 1 file changed, 5 insertions(+)

--- 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 devic
 	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.


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