drm/i915: enable 36bit physical address for hardware status page

This enables possible 36bit address mask on 965G that use physical
address for hw status page.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index bbe47812e4b6..e660ac07f3b2 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -134,6 +134,10 @@ static int i915_init_phys_hws(struct drm_device *dev)
 
         memset(dev_priv->hw_status_page, 0, PAGE_SIZE);
 
+        if (IS_I965G(dev))
+                dev_priv->dma_status_page |= (dev_priv->dma_status_page >> 28) &
+                                             0xf0;
+
         I915_WRITE(HWS_PGA, dev_priv->dma_status_page);
         DRM_DEBUG_DRIVER("Enabled hardware status page\n");
         return 0;