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Commit a1efd14a authored by Chris Wilson's avatar Chris Wilson Committed by Eric Anholt
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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: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Signed-off-by: default avatarEric Anholt <eric@anholt.net>
parent 7de56f43

drivers/gpu/drm/i915/intel_overlay.c

+5 −2
Original line number Diff line number Diff line
@@ -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 */
@@ -990,6 +990,9 @@ static int check_overlay_src(struct drm_device *dev, 
		return -EINVAL;



	/* stride checking */

	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)