Hi Philip, On Sun, Feb 13, 2011 at 11:12:28PM -0800, Philip Rakity wrote: > > sdio_reset sends a CMD52 to reset the sdio card. This is > highly recommended for sdio cards being reinitialized. Since > we do not know if the card is being reinitialized we just send > the command. SD/eMMC cards are supposed to ignore the CMD > before the CMD0. Document why we are doing this. > > Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx> > --- > drivers/mmc/core/core.c | 6 ++++++ > 1 files changed, 6 insertions(+), 0 deletions(-) > > diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c > index 34a7e8c..d9fb0d3 100644 > --- a/drivers/mmc/core/core.c > +++ b/drivers/mmc/core/core.c > @@ -1494,6 +1494,12 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq) > mmc_hostname(host), __func__, host->f_init); > #endif > mmc_power_up(host); > + > + /* > + * sdio_reset sends CMD52 to reset card. Since we do not know > + * if the card is being re-initialzed just send it. CMD52 > + * should be ignored by SD/eMMC cards > + */ > sdio_reset(host); > mmc_go_idle(host); > Thanks, pushed to mmc-next for .39. -- Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/> One Laptop Per Child -- 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
