Re: [PATCH 7/32] mmc: add host capabilities for SD only and MMC only

Adrian Hunter
2009-07-25T19:44:47Z

Matt Fleming wrote:
> On Sat, Jul 25, 2009 at 07:17:14PM +0300, Adrian Hunter wrote:
>> Matt Fleming wrote:
>>> And by saying what capabilities a host supports, when we add new
>>> capabilities we don't have to modify existing code to say that it
>>> doesn't support the new capability.
>> If the capabilities are the other way around, then all existing drivers
>> must be changed. On the other hand, the if statement can easily be
>> improved:
>>
>> #define mmc_cap_mmc(host) (!((host)->caps & MMC_CAP_NOT_MMC))
>> #define mmc_cap_sd(host) (!((host)->caps & MMC_CAP_NOT_SD))
>> #define mmc_cap_sdio(host) (!((host)->caps & MMC_CAP_NOT_SDIO))
>>
>> - mmc_send_if_cond(host, host->ocr_avail);
>> + if (mmc_cap_sdio(host) || mmc_cap_sd(host))
>> + mmc_send_if_cond(host, host->ocr_avail);
>> +
>
> OK, that's a fair point, all drivers would need to be changed. However,
> I'm not adverse to making a one-time change to all drivers in the name
> of sanity. Enumerating what cards a controller doesn't support just
> doesn't sound correct to me.
>
> It wouldn't be a complicated change either, I'd even be happy to write
> the patch ;-)

I have no objections if you write such a patch :-)