DRM: enable bus mastering on i915 at resume time

commit ea7b44c8e6baa1a4507f05ba2c0009ac21c3fe0b upstream

On 9xx chips, bus mastering needs to be enabled at resume time for much of the
chip to function.  With this patch, vblank interrupts will work as expected
on resume, along with other chip functions.   Fixes kernel bugzilla #10844.

Signed-off-by: Jie Luo <clotho67@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/drm/i915_drv.c b/drivers/char/drm/i915_drv.c
index b2b451dc44608870a48cbfea56b7de522044aa40..becab51d0e30230c01723e641c45ec635544316f 100644 (file)
--- a/drivers/char/drm/i915_drv.c
+++ b/drivers/char/drm/i915_drv.c
@@ -385,6 +385,7 @@ static int i915_resume(struct drm_device *dev)
        pci_restore_state(dev->pdev);
        if (pci_enable_device(dev->pdev))
                return -1;
+       pci_set_master(dev->pdev);
 
        pci_write_config_byte(dev->pdev, LBB, dev_priv->saveLBB);