On 19 December 2011 15:40, Subhash Jadavani <[email protected]> wrote:
> Hi Girish,
>
> Overall this patch looks good. I have only 2 minor comments inline below.
>
> Regards,
> Subhash
>
>
>> -----Original Message-----
>> From: [email protected] [mailto:linux-mmc-
>> [email protected]] On Behalf Of Girish K S
>> Sent: Monday, December 19, 2011 12:07 PM
>> To: [email protected]
>> Cc: [email protected]; [email protected]; Girish K S;
>> Chris Ball
>> Subject: [PATCH V6 1/2] mmc: core: HS200 mode support for eMMC 4.5
>>
>> This patch adds the support of the HS200 bus speed for eMMC 4.5
>> devices.
>> The eMMC 4.5 devices have support for 200MHz bus speed. The function
>> prototype of the tuning function is modified to handle the tuning
>> command
>> number which is different in sd and mmc case.
>>
>> cc: Chris Ball <[email protected]>
>> Signed-off-by: Girish K S <[email protected]>
>> ---
>> drivers/mmc/core/bus.c | 3 +-
>> drivers/mmc/core/debugfs.c | 3 +
>> drivers/mmc/core/mmc.c | 147
>> +++++++++++++++++++++++++++++++++++++++++---
>> drivers/mmc/core/sd.c | 3 +-
>> drivers/mmc/core/sdio.c | 4 +-
>> include/linux/mmc/card.h | 3 +
>> include/linux/mmc/mmc.h | 66 +++++++++++++++++++-
>> 7 files changed, 216 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
>> index f8a228a..5d011a3 100644
>> --- a/drivers/mmc/core/bus.c
>> +++ b/drivers/mmc/core/bus.c
>> @@ -303,10 +303,11 @@ int mmc_add_card(struct mmc_card *card)
>> mmc_card_ddr_mode(card) ? "DDR " : "",
>> type);
>> } else {
>> - printk(KERN_INFO "%s: new %s%s%s card at address %04x\n",
>> + pr_info("%s: new %s%s%s%s card at address %04x\n",
>> mmc_hostname(card->host),
>> mmc_card_uhs(card) ? "ultra high speed " :
>> (mmc_card_highspeed(card) ? "high speed " : ""),
>> + (mmc_card_hs200(card) ? "HS200 " : ""),
>> mmc_card_ddr_mode(card) ? "DDR " : "",
>> type, card->rca);
>> }
>> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
>> index 027615d..9ab5b17 100644
>> --- a/drivers/mmc/core/debugfs.c
>> +++ b/drivers/mmc/core/debugfs.c
>> @@ -135,6 +135,9 @@ static int mmc_ios_show(struct seq_file *s, void
>> *data)
>> case MMC_TIMING_UHS_DDR50:
>> str = "sd uhs DDR50";
>> break;
>> + case MMC_TIMING_MMC_HS200:
>> + str = "mmc high-speed SDR200";
>> + break;
>> default:
>> str = "invalid";
>> break;
>> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
>> index f0a9f1f..d5d93de 100644
>> --- a/drivers/mmc/core/mmc.c
>> +++ b/drivers/mmc/core/mmc.c
>> @@ -286,6 +286,27 @@ static int mmc_read_ext_csd(struct mmc_card *card,
>> u8 *ext_csd)
>> }
>> card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
>> switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
>> + case EXT_CSD_CARD_TYPE_SDR_ALL:
>> + case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_8V:
>> + case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_2V:
>> + case EXT_CSD_CARD_TYPE_SDR_ALL_DDR_52:
>> + card->ext_csd.hs_max_dtr = 200000000;
>> + card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_200;
>> + break;
>> + case EXT_CSD_CARD_TYPE_SDR_1_2V_ALL:
>> + case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_8V:
>> + case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_2V:
>> + case EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_52:
>> + card->ext_csd.hs_max_dtr = 200000000;
>> + card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_2V;
>> + break;
>> + case EXT_CSD_CARD_TYPE_SDR_1_8V_ALL:
>> + case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_8V:
>> + case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_2V:
>> + case EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_52:
>> + card->ext_csd.hs_max_dtr = 200000000;
>> + card->ext_csd.card_type = EXT_CSD_CARD_TYPE_SDR_1_8V;
>> + break;
>> case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
>> EXT_CSD_CARD_TYPE_26:
>> card->ext_csd.hs_max_dtr = 52000000;
>> @@ -700,6 +721,52 @@ static int mmc_select_powerclass(struct mmc_card
>> *card,
>> }
>>
>> /*
>> + * Selects the desired buswidth and switch to the HS200 mode
>> + * if bus width set without error
>> + */
>> +static int mmc_select_hs200(struct mmc_card *card)
>> +{
>> + int err = 0;
>> + struct mmc_host *host;
>> + u32 bus_width = MMC_BUS_WIDTH_4;
>> +
>> + BUG_ON(!card);
>> +
>> + host = card->host;
>> +
>> + /*
>> + * Host is capable of 8bit transfer, then switch
>> + * the device to work in 8bit transfer mode. If the
>> + * mmc switch command returns error then switch to
>> + * 4bit transfer mode. On success set the corresponding
>> + * bus width on the host.
>> + */
>> + if (host->caps & MMC_CAP_8_BIT_DATA) {
>> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> + EXT_CSD_BUS_WIDTH,
>> + EXT_CSD_BUS_WIDTH_8,
>> + card->ext_csd.generic_cmd6_time);
>> + bus_width = MMC_BUS_WIDTH_8;
>> + }
>> +
>> + /* If the 8bit mode fails switch to 4 bit mode */
>> + if (err)
>> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> + EXT_CSD_BUS_WIDTH,
>> + EXT_CSD_BUS_WIDTH_4,
>> + card->ext_csd.generic_cmd6_time);
>
> Don't you need to set the bus_width = MMC_BUS_WIDTH_4 after sending the
> switch?
> Let's say if the host->caps says it support the 8-bit mode but mmc_switch()
> fails but your bus_width will still be MMC_BUS_WIDTH_8. Now you try to set
> the bus width to 4-bit which will succeed but bus_width variable is not
> initialize to 4-bit yet.
Thanks just missed it.
>
>
>
>> +
>> + /* switch to HS200 mode if bus width set successfully */
>> + if (!err) {
>> + mmc_set_bus_width(card->host, bus_width);
>> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> + EXT_CSD_HS_TIMING, 2, 0);
>> + }
>> +
>> + return err;
>> +}
>> +
>> +/*
>> * Handle the detection and initialisation of a card.
>> *
>> * In the case of a resume, "oldcard" will contain the card
>> @@ -905,11 +972,15 @@ static int mmc_init_card(struct mmc_host *host,
>> u32 ocr,
>> /*
>> * Activate high speed (if supported)
>> */
>> - 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,
>> - card->ext_csd.generic_cmd6_time);
>> + if (card->ext_csd.hs_max_dtr != 0) {
>> + err = 0;
>> + if ((card->ext_csd.hs_max_dtr > 52000000) &&
>> + (host->caps2 & MMC_CAP2_HS200))
>> + err = mmc_select_hs200(card);
>> + else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
>> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> + EXT_CSD_HS_TIMING, 1, 0);
>> +
>> if (err && err != -EBADMSG)
>> goto free_card;
>>
>> @@ -918,8 +989,15 @@ static int mmc_init_card(struct mmc_host *host,
>> u32 ocr,
>> mmc_hostname(card->host));
>> err = 0;
>> } else {
>> - mmc_card_set_highspeed(card);
>> - mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
>> + if ((card->ext_csd.hs_max_dtr > 52000000) &&
>> + (host->caps2 & MMC_CAP2_HS200)) {
>> + mmc_card_set_hs200(card);
>> + mmc_set_timing(card->host,
>> + MMC_TIMING_MMC_HS200);
>> + } else {
>> + mmc_card_set_highspeed(card);
>> + mmc_set_timing(card->host,
> MMC_TIMING_MMC_HS);
>> + }
>> }
>> }
>>
>> @@ -944,7 +1022,7 @@ static int mmc_init_card(struct mmc_host *host,
>> u32 ocr,
>> */
>> max_dtr = (unsigned int)-1;
>>
>> - if (mmc_card_highspeed(card)) {
>> + if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
>> if (max_dtr > card->ext_csd.hs_max_dtr)
>> max_dtr = card->ext_csd.hs_max_dtr;
>> } else if (max_dtr > card->csd.max_dtr) {
>> @@ -970,9 +1048,60 @@ static int mmc_init_card(struct mmc_host *host,
>> u32 ocr,
>> }
>>
>> /*
>> + * Indicate HS200 SDR mode (if supported).
>> + */
>> + if (mmc_card_hs200(card)) {
>> + u32 ext_csd_bits;
>> + u32 bus_width = card->host->ios.bus_width;
>> +
>> + /*
>> + * For devices supporting HS200 mode, the bus width has
>> + * to be set before executing the tuning function. If
>> + * set before tuning, then device will respond with CRC
>> + * errors for responses on CMD line. So for HS200 the
>> + * sequence will be
>> + * 1. set bus width 4bit / 8 bit (1 bit not supported)
>> + * 2. switch to HS200 mode
>> + * 3. set the clock to > 52Mhz <=200MHz and
>> + * 4. execute tuning for HS200
>> + */
>> + if ((host->caps2 & MMC_CAP2_HS200) &&
>> + card->host->ops->execute_tuning)
>> + err = card->host->ops->execute_tuning(card->host,
>> + MMC_SEND_TUNING_BLOCK_HS200);
>> + if (err) {
>> + pr_warning("tuning execution failed\n");
>> + goto err;
>> + }
>> +
>> + ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
>> + EXT_CSD_BUS_WIDTH_8 :
>> + EXT_CSD_BUS_WIDTH_4;
>> + err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
>> + if (err) {
>> + pr_err("%s: power class selection to bus width"
>> + "%d failed\n", mmc_hostname(card->host),
>> + 1 << bus_width);
>> + goto err;
>> + }
>> +
>> + if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V)
>> + && (host->caps2 & MMC_CAP2_HS200_1_2V_SDR)) {
>> + err = mmc_set_signal_voltage(host,
>> + MMC_SIGNAL_VOLTAGE_120, 0);
>
> Shouldn't this voltage switch be done in mmc_select_hs200() before selecting
> the bus width and timings?
Will it affect the functionality?. Since it it IO voltage I think it
can be done here. And I am setting the Host specific timing and
buswidth again.
is ur intention to avoid setting timing and buswidth again?
>
>
>
>
>
>> +
>> + if (err)
>> + goto err;
>> + mmc_set_timing(card->host, MMC_TIMING_MMC_HS200);
>> + mmc_set_bus_width(card->host, bus_width);
>> + }
>> + }
>> +
>> + /*
>> * Activate wide bus and DDR (if supported).
>> */
>> - if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
>> + if (!mmc_card_hs200(card) &&
>> + (card->csd.mmca_vsn >= CSD_SPEC_VER_3) &&
>> (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
>> static unsigned ext_csd_bits[][2] = {
>> { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
>> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
>> index 6f27d35..a775131 100644
>> --- a/drivers/mmc/core/sd.c
>> +++ b/drivers/mmc/core/sd.c
>> @@ -661,7 +661,8 @@ static int mmc_sd_init_uhs_card(struct mmc_card
>> *card)
>>
>> /* SPI mode doesn't define CMD19 */
>> if (!mmc_host_is_spi(card->host) && card->host->ops-
>> >execute_tuning)
>> - err = card->host->ops->execute_tuning(card->host);
>> + err = card->host->ops->execute_tuning(card->host, \
>> +
> MMC_SEND_TUNING_BLOCK);
>>
>> out:
>> kfree(status);
>> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
>> index b77f770..bd7bacc 100644
>> --- a/drivers/mmc/core/sdio.c
>> +++ b/drivers/mmc/core/sdio.c
>> @@ -14,6 +14,7 @@
>>
>> #include <linux/mmc/host.h>
>> #include <linux/mmc/card.h>
>> +#include <linux/mmc/mmc.h>
>> #include <linux/mmc/sdio.h>
>> #include <linux/mmc/sdio_func.h>
>> #include <linux/mmc/sdio_ids.h>
>> @@ -556,7 +557,8 @@ static int mmc_sdio_init_uhs_card(struct mmc_card
>> *card)
>>
>> /* Initialize and start re-tuning timer */
>> if (!mmc_host_is_spi(card->host) && card->host->ops-
>> >execute_tuning)
>> - err = card->host->ops->execute_tuning(card->host);
>> + err = card->host->ops->execute_tuning(card->host,
>> +
> MMC_SEND_TUNING_BLOCK);
>>
>> out:
>>
>> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
>> index 9478a6b..9f22ba5 100644
>> --- a/include/linux/mmc/card.h
>> +++ b/include/linux/mmc/card.h
>> @@ -216,6 +216,7 @@ struct mmc_card {
>> #define MMC_STATE_ULTRAHIGHSPEED (1<<5) /* card is in ultra
>> high speed mode */
>> #define MMC_CARD_SDXC (1<<6) /* card is SDXC */
>> #define MMC_CARD_REMOVED (1<<7) /* card has been
>> removed */
>> +#define MMC_STATE_HIGHSPEED_200 (1<<8) /* card is in
>> HS200 mode */
>> unsigned int quirks; /* card quirks */
>> #define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0
>> writes outside of the VS CCCR range */
>> #define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1) /* use func-
>> >cur_blksize */
>> @@ -374,6 +375,7 @@ static inline void __maybe_unused
>> remove_quirk(struct mmc_card *card, int data)
>> #define mmc_card_present(c) ((c)->state & MMC_STATE_PRESENT)
>> #define mmc_card_readonly(c) ((c)->state & MMC_STATE_READONLY)
>> #define mmc_card_highspeed(c) ((c)->state & MMC_STATE_HIGHSPEED)
>> +#define mmc_card_hs200(c) ((c)->state & MMC_STATE_HIGHSPEED_200)
>> #define mmc_card_blockaddr(c) ((c)->state & MMC_STATE_BLOCKADDR)
>> #define mmc_card_ddr_mode(c) ((c)->state & MMC_STATE_HIGHSPEED_DDR)
>> #define mmc_card_uhs(c) ((c)->state &
>> MMC_STATE_ULTRAHIGHSPEED)
>> @@ -384,6 +386,7 @@ static inline void __maybe_unused
>> remove_quirk(struct mmc_card *card, int data)
>> #define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
>> #define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
>> #define mmc_card_set_highspeed(c) ((c)->state |= MMC_STATE_HIGHSPEED)
>> +#define mmc_card_set_hs200(c) ((c)->state |=
>> MMC_STATE_HIGHSPEED_200)
>> #define mmc_card_set_blockaddr(c) ((c)->state |= MMC_STATE_BLOCKADDR)
>> #define mmc_card_set_ddr_mode(c) ((c)->state |=
>> MMC_STATE_HIGHSPEED_DDR)
>> #define mmc_card_set_uhs(c) ((c)->state |= MMC_STATE_ULTRAHIGHSPEED)
>> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
>> index 665548e..2c8cc69 100644
>> --- a/include/linux/mmc/mmc.h
>> +++ b/include/linux/mmc/mmc.h
>> @@ -51,6 +51,7 @@
>> #define MMC_READ_SINGLE_BLOCK 17 /* adtc [31:0] data addr R1
>> */
>> #define MMC_READ_MULTIPLE_BLOCK 18 /* adtc [31:0] data addr R1
>> */
>> #define MMC_SEND_TUNING_BLOCK 19 /* adtc R1
>> */
>> +#define MMC_SEND_TUNING_BLOCK_HS200 21 /* adtc R1 */
>>
>> /* class 3 */
>> #define MMC_WRITE_DAT_UNTIL_STOP 20 /* adtc [31:0] data addr R1
>> */
>> @@ -339,13 +340,76 @@ struct _mmc_csd {
>>
>> #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 0xF /* Mask out reserved bits */
>> +#define EXT_CSD_CARD_TYPE_MASK 0x3F /* Mask out reserved bits */
>> #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 */
>> + /* SDR mode @1.2V I/O */
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_200 (EXT_CSD_CARD_TYPE_SDR_1_8V \
>> + | EXT_CSD_CARD_TYPE_SDR_1_2V)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_ALL (EXT_CSD_CARD_TYPE_SDR_200 \
>> + | EXT_CSD_CARD_TYPE_52 \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_1_2V_ALL
>> (EXT_CSD_CARD_TYPE_SDR_1_2V \
>> + | EXT_CSD_CARD_TYPE_52 \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_1_8V_ALL
>> (EXT_CSD_CARD_TYPE_SDR_1_8V \
>> + | EXT_CSD_CARD_TYPE_52 \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_8V
>> (EXT_CSD_CARD_TYPE_SDR_1_2V \
>> + | EXT_CSD_CARD_TYPE_DDR_1_8V
> \
>> + | EXT_CSD_CARD_TYPE_52
> \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_8V
>> (EXT_CSD_CARD_TYPE_SDR_1_8V \
>> + | EXT_CSD_CARD_TYPE_DDR_1_8V
> \
>> + | EXT_CSD_CARD_TYPE_52
> \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_1_2V
>> (EXT_CSD_CARD_TYPE_SDR_1_2V \
>> + | EXT_CSD_CARD_TYPE_DDR_1_2V
> \
>> + | EXT_CSD_CARD_TYPE_52
> \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_1_2V
>> (EXT_CSD_CARD_TYPE_SDR_1_8V \
>> + | EXT_CSD_CARD_TYPE_DDR_1_2V
> \
>> + | EXT_CSD_CARD_TYPE_52
> \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_1_2V_DDR_52
>> (EXT_CSD_CARD_TYPE_SDR_1_2V \
>> + | EXT_CSD_CARD_TYPE_DDR_52
> \
>> + | EXT_CSD_CARD_TYPE_52
> \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_1_8V_DDR_52
>> (EXT_CSD_CARD_TYPE_SDR_1_8V \
>> + | EXT_CSD_CARD_TYPE_DDR_52
> \
>> + | EXT_CSD_CARD_TYPE_52
> \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_8V
>> (EXT_CSD_CARD_TYPE_SDR_200 \
>> + | EXT_CSD_CARD_TYPE_DDR_1_8V
> \
>> + | EXT_CSD_CARD_TYPE_52
> \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_ALL_DDR_1_2V
>> (EXT_CSD_CARD_TYPE_SDR_200 \
>> + | EXT_CSD_CARD_TYPE_DDR_1_2V
> \
>> + | EXT_CSD_CARD_TYPE_52
> \
>> + | EXT_CSD_CARD_TYPE_26)
>> +
>> +#define EXT_CSD_CARD_TYPE_SDR_ALL_DDR_52 (EXT_CSD_CARD_TYPE_SDR_200
>> \
>> + | EXT_CSD_CARD_TYPE_DDR_52
> \
>> + | EXT_CSD_CARD_TYPE_52
> \
>> + | EXT_CSD_CARD_TYPE_26)
>>
>> #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 */
>> --
>> 1.7.1
>>
>> --
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>
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