Merge branch 'master' into percpu

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
index 01feb48af333..4157547cc6e4 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
@@ -29,6 +29,25 @@
 #include "drmP.h"
 #include "ttm/ttm_placement.h"
 
+bool vmw_fifo_have_3d(struct vmw_private *dev_priv)
+{
+        __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
+        uint32_t fifo_min, hwversion;
+
+        fifo_min = ioread32(fifo_mem  + SVGA_FIFO_MIN);
+        if (fifo_min <= SVGA_FIFO_3D_HWVERSION * sizeof(unsigned int))
+                return false;
+
+        hwversion = ioread32(fifo_mem + SVGA_FIFO_3D_HWVERSION);
+        if (hwversion == 0)
+                return false;
+
+        if (hwversion < SVGA3D_HWVERSION_WS65_B1)
+                return false;
+
+        return true;
+}
+
 int vmw_fifo_init(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)
 {
         __le32 __iomem *fifo_mem = dev_priv->mmio_virt;
@@ -98,8 +117,7 @@ int vmw_fifo_init(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)
                  (unsigned int) min,
                  (unsigned int) fifo->capabilities);
 
-        dev_priv->fence_seq = (uint32_t) -100;
-        dev_priv->last_read_sequence = (uint32_t) -100;
+        dev_priv->fence_seq = dev_priv->last_read_sequence;
         iowrite32(dev_priv->last_read_sequence, fifo_mem + SVGA_FIFO_FENCE);
 
         return vmw_fifo_send_fence(dev_priv, &dummy);