intel: Align untiled region height to 2 according to 965 docs.

This may or may not be required pre-965, but it doesn't seem unlikely, and
I'd rather be safe.
(cherry picked from commit b053474378633249be0e9f24010650ffb816229a)

diff --git a/src/mesa/drivers/dri/intel/intel_regions.c b/src/mesa/drivers/dri/intel/intel_regions.c
index 0aa5b8c..b8d2dec 100644 (file)
--- a/src/mesa/drivers/dri/intel/intel_regions.c
+++ b/src/mesa/drivers/dri/intel/intel_regions.c
@@ -114,6 +114,13 @@ intel_region_alloc(struct intel_context *intel,
 {
    dri_bo *buffer;
 
+   /* If we're untiled, we have to align to 2 rows high because the
+    * data port accesses 2x2 blocks even if the bottom row isn't to be
+    * rendered, so failure to align means we could walk off the end of the
+    * GTT and fault.
+    */
+   height = ALIGN(height, 2);
+
    if (expect_accelerated_upload) {
       buffer = drm_intel_bo_alloc_for_render(intel->bufmgr, "region",
                                             pitch * cpp * height, 64);