[MMC] sdhci: more DMA capabilities tests
Properly test for controller interface to see if it's DMA capable. As many controllers are misconfigured in this regard, also add debug parameters to force DMA support either way. Signed-off-by: NPierre Ossman <drzeus@drzeus.cx> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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