From 3a7c25ff8ddd45c9d9eca5cc2228552847ca9e7d Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon, 12 Jul 2010 19:47:46 +0100
Subject: video: Apply overlay stride errata for i830 and i845

Due to an erratum on these chipsets, the overlay stride must be a
multiple of 256 bytes.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 src/intel_video.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src')

diff --git a/src/intel_video.c b/src/intel_video.c
index 11fd7fad..f99cad89 100644
--- a/src/intel_video.c
+++ b/src/intel_video.c
@@ -1383,6 +1383,11 @@ intel_setup_dst_params(ScrnInfoPtr scrn, intel_adaptor_private *adaptor_priv, sh
 			 * stride must be at least 512 bytes. Take the easy fix
 			 * and align on 512 bytes unconditionally. */
 			pitchAlignMask = 511;
+		else if (IS_I830(intel) || IS_845G(intel))
+			/* Harsh, errata on these chipsets limit the stride to be
+			 * a multiple of 256 bytes.
+			 */
+			pitchAlignMask = 255;
 		else
 			pitchAlignMask = 63;
 	}
-- 
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