From: Yong Ding <yongd@marvell.com>
Date: Tue, 15 May 2012 05:09:43 +0000 (+0800)
Subject: mmc: sdio: fix setting card data bus width as 4-bit
X-Git-Tag: v3.5-rc4~28^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2a0fe914a38745f5b03534c4e4f4056cbd6978b8;p=pandora-kernel.git

mmc: sdio: fix setting card data bus width as 4-bit

SDIO_CCCR_IF[1:0] in SDIO card is used for card data bus width
setting as below:

     00b: 1-bit bus
     01b: Reserved
     10b: 4-bit bus
     11b: 8-bit bus (only for embedded SDIO)

And sdio_enable_wide is for setting data bus width as 4-bit.
But currently, it first reads the register, second OR' 1b with
SDIO_CCCR_IF[1], and then writes it back.

As we can see, this is based on such assumption that the
SDIO_CCCR_IF[0] is always 0. Apparently, this is not right.

Signed-off-by: Yong Ding <yongd@marvell.com>
Acked-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
---

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