On 30 September 2016 at 08:18, Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> wrote: > Per JESD84-B51 P49, Host need to change frequency to <=52MHz > after setting HS_TIMING to 0x1, and host may changes frequency > to <= 200MHz after setting HS_TIMING to 0x3. That means the card > expects the clock rate to increase from the current used f_init > (which is less than 400KHz, but still being less than 52MHz) to > 52MHz, otherwise we find some eMMC devices significantly report > failure when sending status. > > Reported-by: Xiao Yao <xiaoyao@xxxxxxxxxxxxxx> > Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> > > Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx> Thanks, applied for fixes! Kind regards Uffe > --- > > Changes in v3: > - add Doug's tag and fix the wrong page index of spec > > Changes in v2: > - improve the changelog > > drivers/mmc/core/mmc.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c > index f4ed5ac..39fc5b2 100644 > --- a/drivers/mmc/core/mmc.c > +++ b/drivers/mmc/core/mmc.c > @@ -1282,6 +1282,8 @@ static int mmc_select_hs400es(struct mmc_card *card) > if (err) > goto out_err; > > + mmc_set_clock(host, card->ext_csd.hs_max_dtr); > + > err = mmc_switch_status(card); > if (err) > goto out_err; > -- > 2.3.7 > > > -- > 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 -- 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
