gpu: ipu-v3: add driver for Prefetch Resolve Engine
This adds support for the i.MX6 QuadPlus PRE units. Currently only linear prefetch into SRAM is supported, other modes of operation like the tiled-to-linear conversion will be added later. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
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