On Friday 18 February 2011, Nath, Arindam wrote: > > AFAICT, whether CMD23 can be used or not is primarily a decision based > > on > > the card, and the block driver might want issue it for a longer range > > if it needs to split a block request into multiple MMC requests. > > Thanks for the comments. Yes, whether a card supports CMD23 depends on > the card, but Auto CMD23 is a feature added to the Host Controller v3.00 > just like Auto CMD12. I am already doing a check inside > sdhci_host_auto_cmd23_supported() whether the card supports CMD23, and > whether the request is for multiple block transfers. Also I tried to make > my implementation consistent with Auto CMD12 implementation already > there in the sdhc code. Ok, I see. But, assuming that the block driver was changed to always to CMD23 where appropriate, what is the advantage auf Auto CMD23? As far as I can tell, changing the block driver would make all hosts faster, not just sdhci, and it would be able to cover the split requests I mentioned. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
