Re: [PATCH][Updated] New AT91 MCI Driver that supports both MCI slots used at the same time

Rob Emanuele
2009-06-08T16:58:18Z

Hi Haavard,

I'd be happy to reintegrate my changes to this back into the Atmel
driver once I get it working correct on the at91. Do you have the
equipment to give my changes a try?

Converting my #defines for the the features to cpu_is_xxx is easy
enough. I'll take care of that.

Thanks,

Rob

On Mon, Jun 8, 2009 at 3:47 AM, Haavard
Skinnemoen<haavard.skinnemoen@atmel.com> wrote:
> Rob Emanuele wrote:
>> This driver is a port the Atmel AVR32 MCI driver which uses similar silicon.
>
> While I do understand the motivation for this patch, I was kind of
> hoping we could reduce the number of drivers for the Atmel MCI
> hardware, not increase it...
>
> So I think it would be much better if your changes were integrated into
> one of the existing drivers.
>
>> Joey Oravec has mentioned that he has had better reliability with the chip
>> he is using (AT91SAM9261) if the MMC controller is reset before each
>> command.  There is a compile time option to do just that.
>
> This could be a useful option for atmel-mci too.
>
>> Joey Oravec has stated that the Read and Write Proof functionality that
>> prevents buffer overflows is not available on the AT91SAM9261.  This was
>> confirmed by Nicolas Ferre and also affects the AT91RM9200.  This new
>> patch excludes those register config bits.
>
> Preferably use the cpu_is_xxx() functions to achieve that. Perhaps even
> wrap those tests inside a mci_has_xxproof() function to make it
> clearer what you're testing for, and easier to change if we decide to
> do the test based on version registers, etc. later.
>
> Haavard
>