On Tue, Dec 2, 2008 at 05:56, Li Yi wrote: > A drawback about new mmc_spi driver is that, it uses duplex transfer for > data R/W. On Blackfin SPI only has one DMA channel. Duplex transfer has > to work in PIO mode, resulting high CPU usage. > > So maybe we should keep the old spi_mmc driver, which does not use > duplex transfer. Or rewrite mmc_spi to not to use duplex transfer at > all.
or our bus driver should respect is_dma_mapped in the spi_message structure and the spi_mmc driver should only use a dma buffer on large buffers rather than small control messages -mike _______________________________________________ Linux-kernel-commits mailing list [email protected] http://blackfin.uclinux.org/mailman/listinfo/linux-kernel-commits
