2013/3/22 Huang Changming-R66093 <[email protected]>: >> Jerry, >> >> Function _mmc_detect_card_removed should only be called when card >> insert/removal or i/o error occur unless POLLING is used(called once per >> second). So it should _not_ impact performance much. > [jerry] > No, your understanding is wrong. > Function "_mmc_detect_card_removed " is called to check if our card has been > removed when driver run the function "mmc_rescan" every time. >
But when will mmc_rescan be called? Besides boot up, only when card status change it will be called. So usually it should _not_ be called frequently. >> POLLING is poor for performance, why not change to slot-gpio if host is >> broken for card detect. > [jerry] > Some our boards can't support interrupt mode to detect card insert/removable, > so we unify the poll mode. > Not support gpio interrupt? I think you only don't support sdh host interrupt. Thanks Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
