From: Sonny Rao <sonnyrao@chromium.org>
Date: Thu, 16 Oct 2014 16:58:05 +0000 (-0700)
Subject: mmc: dw_mmc: Reset DMA before enabling IDMAC
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~28^2~100
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=536f6b91d21b81bec6c8a675b3a00052ee05f986;p=pandora-kernel.git

mmc: dw_mmc: Reset DMA before enabling IDMAC

We've already got a reset of DMA after it's done.  Add one before we
start DMA too.  This fixes a data corruption on Rockchip SoCs which
will get bad data when doing a DMA transfer after doing a PIO transfer.

We tested this on an Exynos 5800 with HS200 and didn't notice any
difference in sequential read throughput.

Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---

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