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drm/i915: Check overlay stride errata for i830 and i845

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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@chris-wilson.co.uk>
Cc: stable@kernel.org
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Chris Wilson 2010-07-12 19:35:38 +01:00 committed by Eric Anholt
parent 7de56f43e0
commit a1efd14a99
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/i915/intel_overlay.c
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@ -958,7 +958,7 @@ static int check_overlay_src(struct drm_device *dev,
|| 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 */
@ -990,7 +990,10 @@ static int check_overlay_src(struct drm_device *dev,
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;