Hi,
J Freyensee wrote:
>
> On 09/21/2011 07:12 PM, Seungwon Jeon wrote:
> > EXT_CSD[248] includes the default maximum timeout for CMD6.
> > This field is added at eMMC4.5 Spec. And it can be used for default
> > timeout except for some operations which don't define the timeout(i.e.
> > background operation, sanitize, flush cache) in eMMC4.5 Spec.
>
> Out of curiosity, what cache is being refered to in 'flush cache' comment?
It is described in eMMC4.5 Spec.
Best regards,
Seungwon Jeon.
> >
> > Signed-off-by: Seungwon Jeon<tgih.jun@xxxxxxxxxxx>
> > ---
> > drivers/mmc/core/mmc.c | 16 ++++++++++++----
> > include/linux/mmc/card.h | 1 +
> > include/linux/mmc/mmc.h | 1 +
> > 3 files changed, 14 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> > index 5700b1c..b2ee14a 100644
> > --- a/drivers/mmc/core/mmc.c
> > +++ b/drivers/mmc/core/mmc.c
> > @@ -410,6 +410,12 @@ static int mmc_read_ext_csd(struct mmc_card *card,
> u8 *ext_csd)
> > else
> > card->erased_byte = 0x0;
> >
> > + if (card->ext_csd.rev>= 6)
> > + card->ext_csd.generic_cmd6_time = 10 *
> > + ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
> > + else
> > + card->ext_csd.generic_cmd6_time = 0;
> > +
> > out:
> > return err;
> > }
> > @@ -668,7 +674,8 @@ static int mmc_init_card(struct mmc_host *host, u32
> ocr,
> > */
> > if (card->ext_csd.enhanced_area_en) {
> > err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> > - EXT_CSD_ERASE_GROUP_DEF, 1, 0);
> > + EXT_CSD_ERASE_GROUP_DEF, 1,
> > + card->ext_csd.generic_cmd6_time);
> >
> > if (err&& err != -EBADMSG)
> > goto free_card;
> > @@ -711,7 +718,8 @@ static int mmc_init_card(struct mmc_host *host, u32
> ocr,
> > if ((card->ext_csd.hs_max_dtr != 0)&&
> > (host->caps& MMC_CAP_MMC_HIGHSPEED)) {
> > err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> > - EXT_CSD_HS_TIMING, 1, 0);
> > + EXT_CSD_HS_TIMING, 1,
> > + card->ext_csd.generic_cmd6_time);
> > if (err&& err != -EBADMSG)
> > goto free_card;
> >
> > @@ -783,7 +791,7 @@ static int mmc_init_card(struct mmc_host *host, u32
> ocr,
> > err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> > EXT_CSD_BUS_WIDTH,
> > ext_csd_bits[idx][0],
> > - 0);
> > + card->ext_csd.generic_cmd6_time);
> > if (!err) {
> > mmc_set_bus_width(card->host, bus_width);
> >
> > @@ -806,7 +814,7 @@ static int mmc_init_card(struct mmc_host *host, u32
> ocr,
> > err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> > EXT_CSD_BUS_WIDTH,
> > ext_csd_bits[idx][1],
> > - 0);
> > + card->ext_csd.generic_cmd6_time);
> > }
> > if (err) {
> > printk(KERN_WARNING "%s: switch to bus width %d ddr %d
> "
> > diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> > index b460fc2..b713abf 100644
> > --- a/include/linux/mmc/card.h
> > +++ b/include/linux/mmc/card.h
> > @@ -52,6 +52,7 @@ struct mmc_ext_csd {
> > u8 part_config;
> > unsigned int part_time; /* Units: ms */
> > unsigned int sa_timeout; /* Units: 100ns */
> > + unsigned int generic_cmd6_time; /* Units: 10ms */
> > unsigned int hs_max_dtr;
> > unsigned int sectors;
> > unsigned int card_type;
> > diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> > index 5a794cb..e869f00 100644
> > --- a/include/linux/mmc/mmc.h
> > +++ b/include/linux/mmc/mmc.h
> > @@ -293,6 +293,7 @@ struct _mmc_csd {
> > #define EXT_CSD_SEC_ERASE_MULT 230 /* RO */
> > #define EXT_CSD_SEC_FEATURE_SUPPORT 231 /* RO */
> > #define EXT_CSD_TRIM_MULT 232 /* RO */
> > +#define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
> >
> > /*
> > * EXT_CSD field definitions
> > --
> > 1.7.0.4
> >
> > --
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>
>
> --
> J (James/Jay) Freyensee
> Storage Technology Group
> Intel Corporation
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