tree 4b08dd7298248cec43d56b8cd73e535f5f4130fd
parent 93c712f99d8e412b2d297edfe9f59b90636897c1
author Girish K S <girish.shivananjappa@linaro.org> 1314350898 +0530
committer Chris Ball <cjb@laptop.org> 1314822352 -0400

mmc: sdhci-s3c: Fix mmc card I/O problem

This patch fixes the problem in sdhci-s3c host driver for Samsung Soc's.
During the card identification stage the mmc core driver enumerates for
the best bus width in combination with the highest available data rate.
It starts enumerating from the highest bus width (8) to lowest width (1).

In case of few MMC cards the 4-bit bus enumeration fails and tries
the 1-bit bus enumeration. When switched to 1-bit bus mode the host driver
has to clear the previous bus width setting and apply the new setting.

The current patch will clear the previous bus mode and apply the new
mode setting.

Signed-off-by: Girish K S <girish.shivananjappa@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Cc: <stable@kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>