Messages in this thread | | | Date | Sat, 25 Jul 2009 19:40:30 +0100 | From | Matt Fleming <> | Subject | Re: [PATCH 7/32] mmc: add host capabilities for SD only and MMC only |
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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 ;-)
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