mmc: atmel-mci: fix timeout errors in SDIO mode when using DMA
authorLudovic Desroches <ludovic.desroches@atmel.com>
Wed, 20 Nov 2013 15:01:11 +0000 (16:01 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 13 Feb 2014 21:48:00 +0000 (13:48 -0800)
commit6bf1831daef67ae1a1b183ebed11885ea9bf9e1d
tree664dd97e7224a385577278d9c2602208a1870e00
parent1e06335d339132ecbb4196ede2cf1c2b618b0121
mmc: atmel-mci: fix timeout errors in SDIO mode when using DMA

commit 66b512eda74d59b17eac04c4da1b38d82059e6c9 upstream.

With some SDIO devices, timeout errors can happen when reading data.
To solve this issue, the DMA transfer has to be activated before sending
the command to the device. This order is incorrect in PDC mode. So we
have to take care if we are using DMA or PDC to know when to send the
MMC command.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/mmc/host/atmel-mci.c