On Thu, March 13, 2014, Ulf Hansson wrote:
> On 7 March 2014 15:36, Seungwon Jeon <tgih.jun@xxxxxxxxxxx> wrote:
> > Device types which are supported by both host and device
> > can be identified when EXT_CSD is read. There is no need to
> > check host's capability anymore.
> >
> > Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
> > ---
> > Changes in v2:
> > Just rebased with latest one.
> >
> > drivers/mmc/core/mmc.c | 77 ++++++++++++++++++++++++++-------------------
> > include/linux/mmc/card.h | 6 ++-
> > include/linux/mmc/host.h | 6 ---
> > include/linux/mmc/mmc.h | 12 +++++--
> > 4 files changed, 56 insertions(+), 45 deletions(-)
> >
> > diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> > index db9655f..0abece0 100644
> > --- a/drivers/mmc/core/mmc.c
> > +++ b/drivers/mmc/core/mmc.c
> > @@ -243,28 +243,46 @@ static void mmc_select_card_type(struct mmc_card *card)
> > u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
> > u32 caps = host->caps, caps2 = host->caps2;
> > unsigned int hs_max_dtr = 0;
> > + unsigned int avail_type = 0;
> >
> > - if (card_type & EXT_CSD_CARD_TYPE_26)
> > + if (caps & MMC_CAP_MMC_HIGHSPEED &&
> > + card_type & EXT_CSD_CARD_TYPE_HS_26) {
> > hs_max_dtr = MMC_HIGH_26_MAX_DTR;
> > + avail_type |= EXT_CSD_CARD_TYPE_HS_26;
> > + }
> >
> > if (caps & MMC_CAP_MMC_HIGHSPEED &&
> > - card_type & EXT_CSD_CARD_TYPE_52)
> > + card_type & EXT_CSD_CARD_TYPE_HS_52) {
> > hs_max_dtr = MMC_HIGH_52_MAX_DTR;
> > + avail_type |= EXT_CSD_CARD_TYPE_HS_52;
> > + }
> >
> > - if ((caps & MMC_CAP_1_8V_DDR &&
> > - card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) ||
> > - (caps & MMC_CAP_1_2V_DDR &&
> > - card_type & EXT_CSD_CARD_TYPE_DDR_1_2V))
> > + if (caps & MMC_CAP_1_8V_DDR &&
> > + card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
> > hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
> > + avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
> > + }
> >
> > - if ((caps2 & MMC_CAP2_HS200_1_8V_SDR &&
> > - card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) ||
> > - (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
> > - card_type & EXT_CSD_CARD_TYPE_SDR_1_2V))
> > + if (caps & MMC_CAP_1_2V_DDR &&
> > + card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
> > + hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
> > + avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
> > + }
> > +
> > + if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
> > + card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
> > hs_max_dtr = MMC_HS200_MAX_DTR;
> > + avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
> > + }
> > +
> > + if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
> > + card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
> > + hs_max_dtr = MMC_HS200_MAX_DTR;
> > + avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
> > + }
> >
> > card->ext_csd.hs_max_dtr = hs_max_dtr;
> > - card->ext_csd.card_type = card_type;
> > + card->mmc_avail_type = avail_type;
> > }
> >
> > /*
> > @@ -708,6 +726,11 @@ static struct device_type mmc_type = {
> > .groups = mmc_attr_groups,
> > };
> >
> > +static inline unsigned int mmc_snoop_ddr(struct mmc_card *card)
> > +{
> > + return card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
> > +}
> > +
>
> Having a separate function for this seem a bit silly. Similar checks
> is performed all over the code. I suggest you remove this.
I understand your meaning.
Yes, actually similar checking card type is done.
But checking DDR type is required several times unlike other type case.
I considered for that. I think it's pretty useful in terms of avoiding duplication and enhancement of readability.
>
> > /*
> > * Select the PowerClass for the current bus width
> > * If power class is defined for 4/8 bit bus in the
> > @@ -808,12 +831,10 @@ static int mmc_select_hs200(struct mmc_card *card)
> >
> > host = card->host;
> >
> > - if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
> > - host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
> > + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
> > err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
> >
> > - if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&
> > - host->caps2 & MMC_CAP2_HS200_1_8V_SDR)
> > + if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
> > err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
> >
> > /* If fails try again during next card power cycle */
> > @@ -1072,10 +1093,9 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> > */
> > if (card->ext_csd.hs_max_dtr != 0) {
> > err = 0;
> > - if (card->ext_csd.hs_max_dtr > 52000000 &&
> > - host->caps2 & MMC_CAP2_HS200)
> > + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
> > err = mmc_select_hs200(card);
> > - else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
> > + else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
> > err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> > EXT_CSD_HS_TIMING, 1,
> > card->ext_csd.generic_cmd6_time,
> > @@ -1089,13 +1109,11 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> > mmc_hostname(card->host));
> > err = 0;
> > } else {
> > - if (card->ext_csd.hs_max_dtr > 52000000 &&
> > - host->caps2 & MMC_CAP2_HS200) {
> > + if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
> > mmc_set_timing(card->host,
> > MMC_TIMING_MMC_HS200);
> > - } else {
> > + else
> > mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
> > - }
> > }
> > }
> >
> > @@ -1118,14 +1136,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> > /*
> > * Indicate DDR mode (if supported).
> > */
> > - if (mmc_card_hs(card)) {
> > - if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
> > - && (host->caps & MMC_CAP_1_8V_DDR))
> > - ddr = MMC_1_8V_DDR_MODE;
> > - else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
> > - && (host->caps & MMC_CAP_1_2V_DDR))
> > - ddr = MMC_1_2V_DDR_MODE;
> > - }
> > + if (mmc_card_hs(card))
> > + ddr = mmc_snoop_ddr(card);
> >
> > /*
> > * Indicate HS200 SDR mode (if supported).
> > @@ -1145,8 +1157,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> > * 3. set the clock to > 52Mhz <=200MHz and
> > * 4. execute tuning for HS200
> > */
> > - if ((host->caps2 & MMC_CAP2_HS200) &&
> > - card->host->ops->execute_tuning) {
> > + if (card->host->ops->execute_tuning) {
> > mmc_host_clk_hold(card->host);
> > err = card->host->ops->execute_tuning(card->host,
> > MMC_SEND_TUNING_BLOCK_HS200);
> > @@ -1255,7 +1266,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> > *
> > * WARNING: eMMC rules are NOT the same as SD DDR
> > */
> > - if (ddr == MMC_1_2V_DDR_MODE) {
> > + if (ddr & EXT_CSD_CARD_TYPE_DDR_1_2V) {
> > err = __mmc_set_signal_voltage(host,
> > MMC_SIGNAL_VOLTAGE_120);
> > if (err)
> > diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> > index 5473133..c232b10 100644
> > --- a/include/linux/mmc/card.h
> > +++ b/include/linux/mmc/card.h
> > @@ -68,7 +68,6 @@ struct mmc_ext_csd {
> > #define MMC_HIGH_DDR_MAX_DTR 52000000
> > #define MMC_HS200_MAX_DTR 200000000
> > unsigned int sectors;
> > - unsigned int card_type;
> > unsigned int hc_erase_size; /* In sectors */
> > unsigned int hc_erase_timeout; /* In milliseconds */
> > unsigned int sec_trim_mult; /* Secure trim multiplier */
> > @@ -297,7 +296,10 @@ struct mmc_card {
> > const char **info; /* info strings */
> > struct sdio_func_tuple *tuples; /* unknown common tuples */
> >
> > - unsigned int sd_bus_speed; /* Bus Speed Mode set for the card */
> > + union {
> > + unsigned int sd_bus_speed; /* Bus Speed Mode set for the card */
> > + unsigned int mmc_avail_type; /* supported device type by both host and card */
>
> Using a union here won't be that much of a gain since there are only
> few instances of the struct. Please remove.
Yes, you're right. It's not much in gain.
I intended to distinguish these two similar members respectively.
It's used only in each specific type domain and not used at the same time.
If no meaningful, I can remove as your suggestion.
Thanks,
Seungwon Jeon
>
> > + };
> >
> > struct dentry *debugfs_root;
> > struct mmc_part part[MMC_NUM_PHY_PARTITION]; /* physical partitions */
> > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> > index 2f263ae..1ee3c10 100644
> > --- a/include/linux/mmc/host.h
> > +++ b/include/linux/mmc/host.h
> > @@ -62,12 +62,6 @@ struct mmc_ios {
> > #define MMC_TIMING_MMC_DDR52 8
> > #define MMC_TIMING_MMC_HS200 9
> >
> > -#define MMC_SDR_MODE 0
> > -#define MMC_1_2V_DDR_MODE 1
> > -#define MMC_1_8V_DDR_MODE 2
> > -#define MMC_1_2V_SDR_MODE 3
> > -#define MMC_1_8V_SDR_MODE 4
> > -
> > unsigned char signal_voltage; /* signalling voltage (1.8V or 3.3V) */
> >
> > #define MMC_SIGNAL_VOLTAGE_330 0
> > diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> > index 50bcde3..f734c0c 100644
> > --- a/include/linux/mmc/mmc.h
> > +++ b/include/linux/mmc/mmc.h
> > @@ -354,18 +354,22 @@ struct _mmc_csd {
> > #define EXT_CSD_CMD_SET_SECURE (1<<1)
> > #define EXT_CSD_CMD_SET_CPSECURE (1<<2)
> >
> > -#define EXT_CSD_CARD_TYPE_26 (1<<0) /* Card can run at 26MHz */
> > -#define EXT_CSD_CARD_TYPE_52 (1<<1) /* Card can run at 52MHz */
> > #define EXT_CSD_CARD_TYPE_MASK 0x3F /* Mask out reserved bits */
> > +#define EXT_CSD_CARD_TYPE_HS_26 (1<<0) /* Card can run at 26MHz */
> > +#define EXT_CSD_CARD_TYPE_HS_52 (1<<1) /* Card can run at 52MHz */
> > +#define EXT_CSD_CARD_TYPE_HS (EXT_CSD_CARD_TYPE_HS_26 | \
> > + EXT_CSD_CARD_TYPE_HS_52)
> > #define EXT_CSD_CARD_TYPE_DDR_1_8V (1<<2) /* Card can run at 52MHz */
> > /* DDR mode @1.8V or 3V I/O */
> > #define EXT_CSD_CARD_TYPE_DDR_1_2V (1<<3) /* Card can run at 52MHz */
> > /* DDR mode @1.2V I/O */
> > #define EXT_CSD_CARD_TYPE_DDR_52 (EXT_CSD_CARD_TYPE_DDR_1_8V \
> > | EXT_CSD_CARD_TYPE_DDR_1_2V)
> > -#define EXT_CSD_CARD_TYPE_SDR_1_8V (1<<4) /* Card can run at 200MHz */
> > -#define EXT_CSD_CARD_TYPE_SDR_1_2V (1<<5) /* Card can run at 200MHz */
> > +#define EXT_CSD_CARD_TYPE_HS200_1_8V (1<<4) /* Card can run at 200MHz */
> > +#define EXT_CSD_CARD_TYPE_HS200_1_2V (1<<5) /* Card can run at 200MHz */
> > /* SDR mode @1.2V I/O */
> > +#define EXT_CSD_CARD_TYPE_HS200 (EXT_CSD_CARD_TYPE_HS200_1_8V | \
> > + EXT_CSD_CARD_TYPE_HS200_1_2V)
> >
> > #define EXT_CSD_BUS_WIDTH_1 0 /* Card is in 1 bit mode */
> > #define EXT_CSD_BUS_WIDTH_4 1 /* Card is in 4 bit mode */
> > --
> > 1.7.0.4
> >
> >
>
> Besides the minor stuff, looks good.
>
> Kind regards
> Ulf Hansson
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