[Mesa-dev] [PATCH] i965: Disable guardband clipping on SandyBridge for odd dimensions

[vadym.shovkoplias]

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104388
Signed-off-by: Andriy Khulap <andriy.khulap at globallogic.com>
---
 src/mesa/drivers/dri/i965/genX_state_upload.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/genX_state_upload.c b/src/mesa/drivers/dri/i965/genX_state_upload.c
index b485e2c..5aa8033 100644
--- a/src/mesa/drivers/dri/i965/genX_state_upload.c
+++ b/src/mesa/drivers/dri/i965/genX_state_upload.c
@@ -2473,6 +2473,17 @@ brw_calculate_guardband_size(uint32_t fb_width, uint32_t fb_height,
     */
    const float gb_size = GEN_GEN >= 7 ? 16384.0f : 8192.0f;
 
+   /* Workaround: prevent gpu hangs on SandyBridge
+    * by disabling guardband clipping for odd dimensions.
+    */
+   if (GEN_GEN == 6 && (fb_width & 1 || fb_height & 1)) {
+      *xmin = -1.0f;
+      *xmax =  1.0f;
+      *ymin = -1.0f;
+      *ymax =  1.0f;
+      return;
+   }
+
    if (m00 != 0 && m11 != 0) {
       /* First, we compute the screen-space render area */
       const float ss_ra_xmin = MIN3(        0, m30 + m00, m30 - m00);
-- 
2.7.4