mmc: alcor: enable DMA for writes

Enable the DMA codepath for writes as well as reads.
This improves write speed from 1mb/sec to 2mb/sec (tested with dd).

The original ampe_stor vendor driver also uses DMA for writes.

Signed-off-by: Daniel Drake <drake@endlessm.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/alcor.c b/drivers/mmc/host/alcor.c
index 7c8f203..3e2efbf 100644 (file)
--- a/drivers/mmc/host/alcor.c
+++ b/drivers/mmc/host/alcor.c
@@ -771,7 +771,8 @@ static void alcor_pre_req(struct mmc_host *mmc,
        data->host_cookie = COOKIE_UNMAPPED;
 
        /* FIXME: looks like the DMA engine works only with CMD18 */
-       if (cmd->opcode != 18)
+       if (cmd->opcode != MMC_READ_MULTIPLE_BLOCK
+                       && cmd->opcode != MMC_WRITE_MULTIPLE_BLOCK)
                return;
        /*
         * We don't do DMA on "complex" transfers, i.e. with