linux-kernel - [31/36] drm/i915: Check overlay stride errata for i830 and i845

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Date:	Fri, 06 Aug 2010 12:20:12 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Eric Anholt <eric@...olt.net>
Subject: [31/36] drm/i915: Check overlay stride errata for i830 and i845

2.6.34-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Chris Wilson <chris@...is-wilson.co.uk>

commit a1efd14a99483a4fb9308902397ed86b69454c99 upstream.

Apparently i830 and i845 cannot handle any stride that is not a multiple
of 256, unlike their brethren which do support 64 byte aligned strides.

Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@...olt.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/i915/intel_overlay.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -950,7 +950,7 @@ static int check_overlay_src(struct drm_
 	    || rec->src_width < N_HORIZ_Y_TAPS*4)
 		return -EINVAL;
 
-	/* check alingment constrains */
+	/* check alignment constraints */
 	switch (rec->flags & I915_OVERLAY_TYPE_MASK) {
 		case I915_OVERLAY_RGB:
 			/* not implemented */
@@ -982,7 +982,10 @@ static int check_overlay_src(struct drm_
 		return -EINVAL;
 
 	/* stride checking */
-	stride_mask = 63;
+	if (IS_I830(dev) || IS_845G(dev))
+		stride_mask = 255;
+	else
+		stride_mask = 63;
 
 	if (rec->stride_Y & stride_mask || rec->stride_UV & stride_mask)
 		return -EINVAL;


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