omap_hsmmc: Implement scatter-gather emulation
Instead of using the bounce buffer, using scatter-gather emulation (as in the OMAP1/2 MMC driver) removes the need of one extra memory copy and improves performance. Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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