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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>
This commit is contained in:
Daniel Drake 2019-03-26 15:04:15 +08:00 committed by Ulf Hansson
parent 7bda9482e7
commit e5a34b0c10
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/host/alcor.c
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@ -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