drm/i965: On I965, use correct 3DSTATE_DRAWING_RECTANGLE command in vblank

The batchbuffer submission paths were fixed to use the 965-specific command,
but the vblank tasklet was not. When the older version is sent, the 965 will
lock up.
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/char/drm/i915_irq.c

@@ -125,6 +125,15 @@ static void i915_vblank_tasklet(struct drm_device *dev)
 
 	i915_kernel_lost_context(dev);
 
+	if (IS_I965G(dev)) {
+		BEGIN_LP_RING(4);
+
+		OUT_RING(GFX_OP_DRAWRECT_INFO_I965);
+		OUT_RING(0);
+		OUT_RING(((sarea_priv->width - 1) & 0xffff) | ((sarea_priv->height - 1) << 16));
+		OUT_RING(0);
+		ADVANCE_LP_RING();
+	} else {
 		BEGIN_LP_RING(6);
 
 		OUT_RING(GFX_OP_DRAWRECT_INFO);
@@ -135,6 +144,7 @@ static void i915_vblank_tasklet(struct drm_device *dev)
 		OUT_RING(0);
 
 		ADVANCE_LP_RING();
+	}
 
 	sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;