Commit e5a34b0c authored Mar 26, 2019 by Daniel Drake Committed by Ulf Hansson Apr 15, 2019

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>

parent 7bda9482

drivers/mmc/host/alcor.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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

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