remove dubious mmc dma chaining code
Rip out the old semi-broken support for DMA channel linkage, in preparation for replacing it with something more capable. Performance is fine if CONFIG_MMC_BLOCK_BOUNCE is enabled, although that bounce buffer wastes memory and CPU time. (In fact it's probably faster than trying to use the dma chaining code this patch removes.) Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
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