Hi Girish, Overall this patch looks good. I have only 2 minor comments inline below. Regards, Subhash > -----Original Message----- > From: linux-mmc-owner@xxxxxxxxxxxxxxx [mailto:linux-mmc- > owner@xxxxxxxxxxxxxxx] On Behalf Of Girish K S > Sent: Monday, December 19, 2011 12:07 PM > To: linux-mmc@xxxxxxxxxxxxxxx > Cc: patches@xxxxxxxxxx; linux-samsung-soc@xxxxxxxxxxxxxxx; 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 <cjb@xxxxxxxxxx> > Signed-off-by: Girish K S <girish.shivananjappa@xxxxxxxxxx> > --- > 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. > + > + /* 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? > + > + 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 > > -- > 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-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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