drm/i915: Allow frame buffers up to 4096x4096 on 915/945 class hardware
The 915 and 945 scanout engines can handle frame buffers up to 4096 pixels wide. Pre-9xx hardware has an 8192 byte stride limit, and so we leave the existing 2048 max in place. I'm not sure why we limit the height to the same value; there's no intrinsic hardware limit in the scanout engine. Signed-off-by: NKeith Packard <keithp@keithp.com> Signed-off-by: NEric Anholt <eric@anholt.net>
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