drm/i915: Check overlay stride errata for i830 and i845
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>
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@ -958,7 +958,7 @@ static int check_overlay_src(struct drm_device *dev,
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|| rec->src_width < N_HORIZ_Y_TAPS*4)
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return -EINVAL;
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/* check alingment constrains */
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/* check alignment constraints */
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switch (rec->flags & I915_OVERLAY_TYPE_MASK) {
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case I915_OVERLAY_RGB:
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/* not implemented */
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@ -990,7 +990,10 @@ static int check_overlay_src(struct drm_device *dev,
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return -EINVAL;
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/* stride checking */
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stride_mask = 63;
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if (IS_I830(dev) || IS_845G(dev))
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stride_mask = 255;
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else
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stride_mask = 63;
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if (rec->stride_Y & stride_mask || rec->stride_UV & stride_mask)
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return -EINVAL;
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