[U-Boot] [PATCH] s5p-mmc: Fix ambiguous setting of data transfer width

[Andy Fleming <afleming@gmail.com>]

On Tue, Aug 30, 2011 at 5:55 AM, Chander Kashyap
<chander.kashyap@linaro.org> wrote:
> mmc data transfer width is set as following:
> WIDE8[5]:
> 0 = Depend on WIDE4
> 1 = 8-bit mode
> WIDE4[1]:
> 1 = 4-bit mode
> 0 = 1-bit mode
>
> In case of 4-bit mode reset 8-bit mode and
> in case of 1-bit mode reset 8-bit mode and 4-bit mode
>
> Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
> ---
> ?drivers/mmc/s5p_mmc.c | ? 10 +++++++---
> ?1 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/s5p_mmc.c b/drivers/mmc/s5p_mmc.c
> index 7786ecf..6e6ad08 100644
> --- a/drivers/mmc/s5p_mmc.c
> +++ b/drivers/mmc/s5p_mmc.c
> @@ -368,12 +368,16 @@ static void mmc_set_ios(struct mmc *mmc)
> ? ? ? ? * 1 = 4-bit mode
> ? ? ? ? * 0 = 1-bit mode
> ? ? ? ? */
> - ? ? ? if (mmc->bus_width == 8)
> + ? ? ? if (mmc->bus_width == 8) {
> ? ? ? ? ? ? ? ?ctrl |= (1 << 5);
> - ? ? ? else if (mmc->bus_width == 4)
> + ? ? ? ? ? ? ? ctrl &= ~(1 << 1);


I know these were like this before, but those numbers are awfully
magical. You should really define constants for them.

Also, this seems like a very confusing way to do this? Why not clear
both bits@the start, and then set the one that is needed?

Andy