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

[Minkyu Kang]

Dear Andy Fleming,

On 1 September 2011 10:23, Andy Fleming <afleming at gmail.com> wrote:
> On Tue, Aug 30, 2011 at 5:55 AM, Chander Kashyap
> <chander.kashyap at 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 at 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.

We decided to use comments instead of defines.

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

Agreed.

Thanks
Minkyu Kang
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