Hi Zhangfei, > -----Original Message----- > From: zhangfei gao [mailto:zhangfei.gao@xxxxxxxxx] > Sent: Thursday, March 24, 2011 4:22 PM > To: Nath, Arindam > Cc: cjb@xxxxxxxxxx; prakity@xxxxxxxxxxx; subhashj@xxxxxxxxxxxxxx; > linux-mmc@xxxxxxxxxxxxxxx; Su, Henry; Lu, Aaron; anath.amd@xxxxxxxxx > Subject: Re: [PATCH v2 02/12] mmc: sd: add support for signal voltage > switch procedure > > On Fri, Mar 4, 2011 at 6:32 AM, Arindam Nath <arindam.nath@xxxxxxx> > wrote: > > Host Controller v3.00 adds another Capabilities register. Apart > > from other things, this new register indicates whether the Host > > Controller supports SDR50, SDR104, and DDR50 UHS-I modes. The spec > > doesn't mention about explicit support for SDR12 and SDR25 UHS-I > > modes, so the Host Controller v3.00 should support them by default. > > Also if the controller support SDR104 mode, it will also support > > SDR50 mode as well. So depending on the host support, we set the > > corresponding MMC_CAP_* flags. One more new register. Host Control2 > > is added in v3.00, which is used during Signal Voltage Switch > > procedure described below. > > > > Since as per v3.00 spec, UHS-I supported hosts should set S18R > > to 1, we set S18R (bit 24) of OCR before sending ACMD41. We also > > need to set XPC (bit 28) of OCR in case the host can supply >150mA. > > This support is indicated by the Maximum Current Capabilities > > register of the Host Controller. > > > > If the response of ACMD41 has both CCS and S18A set, we start the > > signal voltage switch procedure, which if successfull, will switch > > the card from 3.3V signalling to 1.8V signalling. Signal voltage > > switch procedure adds support for a new command CMD11 in the > > Physical Layer Spec v3.01. As part of this procedure, we need to > > set 1.8V Signalling Enable (bit 3) of Host Control2 register, which > > if remains set after 5ms, means the switch to 1.8V signalling is > > successfull. Otherwise, we clear bit 24 of OCR and retry the > > initialization sequence. > > > > Signed-off-by: Arindam Nath <arindam.nath@xxxxxxx> > > --- > > drivers/mmc/core/sd.c | 37 ++++++++++- > > drivers/mmc/core/sd_ops.c | 32 ++++++++++ > > drivers/mmc/core/sd_ops.h | 1 + > > drivers/mmc/host/sdhci.c | 148 > +++++++++++++++++++++++++++++++++++++++++---- > > drivers/mmc/host/sdhci.h | 18 +++++- > > include/linux/mmc/host.h | 10 +++ > > include/linux/mmc/sd.h | 1 + > > 7 files changed, 229 insertions(+), 18 deletions(-) > > > > diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c > > index b3f8a3c..3e82599 100644 > > --- a/drivers/mmc/core/sd.c > > +++ b/drivers/mmc/core/sd.c > > @@ -408,6 +408,7 @@ struct device_type sd_type = { > > int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid) > > { > > int err; > > + u32 rocr; > > > > /* > > * Since we're changing the OCR value, we seem to > > @@ -427,10 +428,25 @@ int mmc_sd_get_cid(struct mmc_host *host, u32 > ocr, u32 *cid) > > if (!err) > > ocr |= 1 << 30; > > > > - err = mmc_send_app_op_cond(host, ocr, NULL); > > + /* If the host can supply more than 150mA, XPC should be set > to 1. */ > > + if (host->caps & (MMC_CAP_SET_XPC_330 | MMC_CAP_SET_XPC_300 | > > + MMC_CAP_SET_XPC_180)) > > + ocr |= 1 << 28; > > + > > + err = mmc_send_app_op_cond(host, ocr, &rocr); > > if (err) > > return err; > > > > + /* > > + * In case CCS and S18A in the response is set, start Signal > Voltage > > + * Switch procedure. SPI mode doesn't support CMD11. > > + */ > > + if (!mmc_host_is_spi(host) && (rocr & 0x41000000)) { > > + err = mmc_start_voltage_switch(host); > > + if (err) > > + return err; > > + } > > + > > if (mmc_host_is_spi(host)) > > err = mmc_send_cid(host, cid); > > else > > @@ -827,11 +843,26 @@ int mmc_attach_sd(struct mmc_host *host) > > } > > > > /* > > + * If the host supports one of UHS-I modes, request the card > > + * to switch to 1.8V signaling level. > > + */ > > + if (host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | > > + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | > MMC_CAP_UHS_DDR50)) > > + host->ocr |= (1 << 24); > > + > > + /* > > * Detect and init the card. > > */ > > err = mmc_sd_init_card(host, host->ocr, NULL); > > - if (err) > > - goto err; > > + if (err == -EAGAIN) { > > + /* > > + * Retry initialization with S18R set to 0. > > + */ > > + host->ocr &= ~(1 << 24); > > + err = mmc_sd_init_card(host, host->ocr, NULL); > > + if (err) > > + goto err; > > + } > > > > mmc_release_host(host); > > err = mmc_add_card(host->card); > > diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c > > index 797cdb5..8a23e2e 100644 > > --- a/drivers/mmc/core/sd_ops.c > > +++ b/drivers/mmc/core/sd_ops.c > > @@ -146,6 +146,38 @@ int mmc_app_set_bus_width(struct mmc_card *card, > int width) > > return 0; > > } > > > > +int mmc_start_voltage_switch(struct mmc_host *host) > > +{ > > + struct mmc_command cmd; > > + int err; > > + > > + BUG_ON(!host); > > + > > + /* > > + * If the host does not provide signal voltage switch > procedure, we > > + * set S18R to 0, and then retry initialization sequence. > > + */ > > + if (!host->ops->start_signal_voltage_switch) > > + return -EAGAIN; > > + > > + memset(&cmd, 0, sizeof(struct mmc_command)); > > + > > + cmd.opcode = SD_SWITCH_VOLTAGE; > > + cmd.arg = 0; > > + cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; > > + > > + err = mmc_wait_for_cmd(host, &cmd, 0); > > + if (err) > > + return err; > > + > > + if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR)) > > + return -EIO; > > + > > + err = host->ops->start_signal_voltage_switch(host); > > + > > + return err; > > +} > > + > > int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) > > { > > struct mmc_command cmd; > > diff --git a/drivers/mmc/core/sd_ops.h b/drivers/mmc/core/sd_ops.h > > index ffc2305..3cfba59 100644 > > --- a/drivers/mmc/core/sd_ops.h > > +++ b/drivers/mmc/core/sd_ops.h > > @@ -20,6 +20,7 @@ int mmc_app_send_scr(struct mmc_card *card, u32 > *scr); > > int mmc_sd_switch(struct mmc_card *card, int mode, int group, > > u8 value, u8 *resp); > > int mmc_app_sd_status(struct mmc_card *card, void *ssr); > > +int mmc_start_voltage_switch(struct mmc_host *host); > > > > #endif > > > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > > index 8914a25..5487a0b 100644 > > --- a/drivers/mmc/host/sdhci.c > > +++ b/drivers/mmc/host/sdhci.c > > @@ -85,6 +85,8 @@ static void sdhci_dumpregs(struct sdhci_host *host) > > printk(KERN_DEBUG DRIVER_NAME ": Cmd: 0x%08x | Max curr: > 0x%08x\n", > > sdhci_readw(host, SDHCI_COMMAND), > > sdhci_readl(host, SDHCI_MAX_CURRENT)); > > + printk(KERN_DEBUG DRIVER_NAME ": Host ctl2: 0x%08x\n", > > + sdhci_readw(host, SDHCI_HOST_CONTROL2)); > > > > if (host->flags & SDHCI_USE_ADMA) > > printk(KERN_DEBUG DRIVER_NAME ": ADMA Err: 0x%08x | > ADMA Ptr: 0x%08x\n", > > @@ -1337,11 +1339,70 @@ out: > > spin_unlock_irqrestore(&host->lock, flags); > > } > > > > +static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc) > > +{ > > + struct sdhci_host *host; > > + u8 pwr; > > + u16 clk, ctrl; > > + u32 present_state; > > + > > + host = mmc_priv(mmc); > > + > > + /* Stop SDCLK */ > > + host = mmc_priv(mmc); > > + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); > > + clk &= ~SDHCI_CLOCK_CARD_EN; > > + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); > > + > > + /* Check whether DAT[3:0] is 0000 */ > > + present_state = sdhci_readl(host, SDHCI_PRESENT_STATE); > > + if (!((present_state & SDHCI_DATA_LVL_MASK) >> > SDHCI_DATA_LVL_SHIFT)) { > > + /* Enable 1.8V Signal Enable in the Host Control2 > register */ > > + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); > > + ctrl |= SDHCI_CTRL_VDD_180; > > + sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); > > Hi, Arindam > > How about adding one call back for switching signal voltage here, > since some controller can not provide voltage by itself, but rely on > external pmic to provide voltage. > For example add one call back in sdhci_ops > int (*set_signal_voltage)(struct sdhci_host *host, int > signal_voltage); > And here could call set_signal_voltage. > if (host->ops->set_signal_voltage) > ret = host->ops->set_signal_voltage(host, ios->signal_voltage); Similar suggestion was provided by Subhash. I will be setting a variable called signal_voltage which will hold either 0 or 1 (3.3V or 1.8V). So controllers can probably take the necessary action based on the value of this variable. I will be adding this support in V3 patchset. Thanks, Arindam > > Thanks a lot. > > > + > > + /* Wait for 5ms */ > > + usleep_range(5000, 5500); > > + > > + ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); > > + if (ctrl & SDHCI_CTRL_VDD_180) { > > + /* Provide SDCLK again and wait for 1ms*/ > > + clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL); > > + clk |= SDHCI_CLOCK_CARD_EN; > > + sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); > > + usleep_range(1000, 1500); > > + > > + /* > > + * If DAT[3:0] level is 1111b, then the card > was > > + * successfully switched to 1.8V signaling. > > + */ > > + present_state = sdhci_readl(host, > SDHCI_PRESENT_STATE); > > + if ((present_state & SDHCI_DATA_LVL_MASK) == > > + SDHCI_DATA_LVL_MASK) { > > + return 0; > > + } > > + } > > + } > > + > > + /* > > + * If we are here, that means the switch to 1.8V signaling > failed. Stop > > + * power to the card, and retry initialization sequence by > setting S18R > > + * to 0. > > + */ > > + pwr = sdhci_readb(host, SDHCI_POWER_CONTROL); > > + pwr &= ~SDHCI_POWER_ON; > > + sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL); > > + > > + return -EAGAIN; > > +} > > + > > static const struct mmc_host_ops sdhci_ops = { > > .request = sdhci_request, > > .set_ios = sdhci_set_ios, > > .get_ro = sdhci_get_ro, > > .enable_sdio_irq = sdhci_enable_sdio_irq, > > + .start_signal_voltage_switch = > sdhci_start_signal_voltage_switch, > > }; > > > > > /********************************************************************* > ********\ > > @@ -1799,7 +1860,9 @@ EXPORT_SYMBOL_GPL(sdhci_alloc_host); > > int sdhci_add_host(struct sdhci_host *host) > > { > > struct mmc_host *mmc; > > - unsigned int caps, ocr_avail; > > + u32 caps[2]; > > + u32 max_current_caps; > > + unsigned int ocr_avail; > > int ret; > > > > WARN_ON(host == NULL); > > @@ -1822,12 +1885,15 @@ int sdhci_add_host(struct sdhci_host *host) > > host->version); > > } > > > > - caps = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host->caps > : > > + caps[0] = (host->quirks & SDHCI_QUIRK_MISSING_CAPS) ? host- > >caps : > > sdhci_readl(host, SDHCI_CAPABILITIES); > > > > + if (host->version >= SDHCI_SPEC_300) > > + caps[1] = sdhci_readl(host, SDHCI_CAPABILITIES_1); > > + > > if (host->quirks & SDHCI_QUIRK_FORCE_DMA) > > host->flags |= SDHCI_USE_SDMA; > > - else if (!(caps & SDHCI_CAN_DO_SDMA)) > > + else if (!(caps[0] & SDHCI_CAN_DO_SDMA)) > > DBG("Controller doesn't have SDMA capability\n"); > > else > > host->flags |= SDHCI_USE_SDMA; > > @@ -1838,7 +1904,8 @@ int sdhci_add_host(struct sdhci_host *host) > > host->flags &= ~SDHCI_USE_SDMA; > > } > > > > - if ((host->version >= SDHCI_SPEC_200) && (caps & > SDHCI_CAN_DO_ADMA2)) > > + if ((host->version >= SDHCI_SPEC_200) && > > + (caps[0] & SDHCI_CAN_DO_ADMA2)) > > host->flags |= SDHCI_USE_ADMA; > > > > if ((host->quirks & SDHCI_QUIRK_BROKEN_ADMA) && > > @@ -1892,10 +1959,10 @@ int sdhci_add_host(struct sdhci_host *host) > > } > > > > if (host->version >= SDHCI_SPEC_300) > > - host->max_clk = (caps & SDHCI_CLOCK_V3_BASE_MASK) > > + host->max_clk = (caps[0] & SDHCI_CLOCK_V3_BASE_MASK) > > >> SDHCI_CLOCK_BASE_SHIFT; > > else > > - host->max_clk = (caps & SDHCI_CLOCK_BASE_MASK) > > + host->max_clk = (caps[0] & SDHCI_CLOCK_BASE_MASK) > > >> SDHCI_CLOCK_BASE_SHIFT; > > > > host->max_clk *= 1000000; > > @@ -1911,7 +1978,7 @@ int sdhci_add_host(struct sdhci_host *host) > > } > > > > host->timeout_clk = > > - (caps & SDHCI_TIMEOUT_CLK_MASK) >> > SDHCI_TIMEOUT_CLK_SHIFT; > > + (caps[0] & SDHCI_TIMEOUT_CLK_MASK) >> > SDHCI_TIMEOUT_CLK_SHIFT; > > if (host->timeout_clk == 0) { > > if (host->ops->get_timeout_clock) { > > host->timeout_clk = host->ops- > >get_timeout_clock(host); > > @@ -1923,7 +1990,7 @@ int sdhci_add_host(struct sdhci_host *host) > > return -ENODEV; > > } > > } > > - if (caps & SDHCI_TIMEOUT_CLK_UNIT) > > + if (caps[0] & SDHCI_TIMEOUT_CLK_UNIT) > > host->timeout_clk *= 1000; > > > > /* > > @@ -1950,21 +2017,76 @@ int sdhci_add_host(struct sdhci_host *host) > > if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA)) > > mmc->caps |= MMC_CAP_4_BIT_DATA; > > > > - if (caps & SDHCI_CAN_DO_HISPD) > > + if (caps[0] & SDHCI_CAN_DO_HISPD) > > mmc->caps |= MMC_CAP_SD_HIGHSPEED | > MMC_CAP_MMC_HIGHSPEED; > > > > if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) && > > mmc_card_is_removable(mmc)) > > mmc->caps |= MMC_CAP_NEEDS_POLL; > > > > + /* UHS-I mode(s) supported by the host controller. */ > > + if (host->version >= SDHCI_SPEC_300) > > + mmc->caps |= MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25; > > + > > + /* SDR104 supports also implies SDR50 support */ > > + if (caps[1] & SDHCI_SUPPORT_SDR104) > > + mmc->caps |= MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50; > > + else if (caps[1] & SDHCI_SUPPORT_SDR50) > > + mmc->caps |= MMC_CAP_UHS_SDR50; > > + > > + if (caps[1] & SDHCI_SUPPORT_DDR50) > > + mmc->caps |= MMC_CAP_UHS_DDR50; > > + > > ocr_avail = 0; > > - if (caps & SDHCI_CAN_VDD_330) > > + /* > > + * According to SD Host Controller spec v3.00, if the Host > System > > + * can afford more than 150mA, Host Driver should set XPC to > 1. Also > > + * the value is meaningful only if Voltage Support in the > Capabilities > > + * register is set. The actual current value is 4 times the > register > > + * value. > > + */ > > + max_current_caps = sdhci_readl(host, SDHCI_MAX_CURRENT); > > + > > + if (caps[0] & SDHCI_CAN_VDD_330) { > > + int max_current_330; > > + > > ocr_avail |= MMC_VDD_32_33 | MMC_VDD_33_34; > > - if (caps & SDHCI_CAN_VDD_300) > > + > > + max_current_330 = ((max_current_caps & > > + SDHCI_MAX_CURRENT_330_MASK) >> > > + SDHCI_MAX_CURRENT_330_SHIFT) * > > + SDHCI_MAX_CURRENT_MULTIPLIER; > > + > > + if (max_current_330 > 150) > > + mmc->caps |= MMC_CAP_SET_XPC_330; > > + } > > + if (caps[0] & SDHCI_CAN_VDD_300) { > > + int max_current_300; > > + > > ocr_avail |= MMC_VDD_29_30 | MMC_VDD_30_31; > > - if (caps & SDHCI_CAN_VDD_180) > > + > > + max_current_300 = ((max_current_caps & > > + SDHCI_MAX_CURRENT_300_MASK) >> > > + SDHCI_MAX_CURRENT_300_SHIFT) * > > + SDHCI_MAX_CURRENT_MULTIPLIER; > > + > > + if (max_current_300 > 150) > > + mmc->caps |= MMC_CAP_SET_XPC_300; > > + } > > + if (caps[0] & SDHCI_CAN_VDD_180) { > > + int max_current_180; > > + > > ocr_avail |= MMC_VDD_165_195; > > > > + max_current_180 = ((max_current_caps & > > + SDHCI_MAX_CURRENT_180_MASK) >> > > + SDHCI_MAX_CURRENT_180_SHIFT) * > > + SDHCI_MAX_CURRENT_MULTIPLIER; > > + > > + if (max_current_180 > 150) > > + mmc->caps |= MMC_CAP_SET_XPC_180; > > + } > > + > > mmc->ocr_avail = ocr_avail; > > mmc->ocr_avail_sdio = ocr_avail; > > if (host->ocr_avail_sdio) > > @@ -2024,7 +2146,7 @@ int sdhci_add_host(struct sdhci_host *host) > > if (host->quirks & SDHCI_QUIRK_FORCE_BLK_SZ_2048) { > > mmc->max_blk_size = 2; > > } else { > > - mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >> > > + mmc->max_blk_size = (caps[0] & SDHCI_MAX_BLOCK_MASK) > >> > > SDHCI_MAX_BLOCK_SHIFT; > > if (mmc->max_blk_size >= 3) { > > printk(KERN_WARNING "%s: Invalid maximum block > size, " > > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h > > index 223762c..95d70e6 100644 > > --- a/drivers/mmc/host/sdhci.h > > +++ b/drivers/mmc/host/sdhci.h > > @@ -69,6 +69,8 @@ > > #define SDHCI_DATA_AVAILABLE 0x00000800 > > #define SDHCI_CARD_PRESENT 0x00010000 > > #define SDHCI_WRITE_PROTECT 0x00080000 > > +#define SDHCI_DATA_LVL_MASK 0x00F00000 > > +#define SDHCI_DATA_LVL_SHIFT 20 > > > > #define SDHCI_HOST_CONTROL 0x28 > > #define SDHCI_CTRL_LED 0x01 > > @@ -147,7 +149,8 @@ > > > > #define SDHCI_ACMD12_ERR 0x3C > > > > -/* 3E-3F reserved */ > > +#define SDHCI_HOST_CONTROL2 0x3E > > +#define SDHCI_CTRL_VDD_180 0x0008 > > > > #define SDHCI_CAPABILITIES 0x40 > > #define SDHCI_TIMEOUT_CLK_MASK 0x0000003F > > @@ -168,9 +171,20 @@ > > #define SDHCI_CAN_VDD_180 0x04000000 > > #define SDHCI_CAN_64BIT 0x10000000 > > > > +#define SDHCI_SUPPORT_SDR50 0x00000001 > > +#define SDHCI_SUPPORT_SDR104 0x00000002 > > +#define SDHCI_SUPPORT_DDR50 0x00000004 > > + > > #define SDHCI_CAPABILITIES_1 0x44 > > > > -#define SDHCI_MAX_CURRENT 0x48 > > +#define SDHCI_MAX_CURRENT 0x48 > > +#define SDHCI_MAX_CURRENT_330_MASK 0x0000FF > > +#define SDHCI_MAX_CURRENT_330_SHIFT 0 > > +#define SDHCI_MAX_CURRENT_300_MASK 0x00FF00 > > +#define SDHCI_MAX_CURRENT_300_SHIFT 8 > > +#define SDHCI_MAX_CURRENT_180_MASK 0xFF0000 > > +#define SDHCI_MAX_CURRENT_180_SHIFT 16 > > +#define SDHCI_MAX_CURRENT_MULTIPLIER 4 > > > > /* 4C-4F reserved for more max current */ > > > > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h > > index bcb793e..ad7daa3 100644 > > --- a/include/linux/mmc/host.h > > +++ b/include/linux/mmc/host.h > > @@ -117,6 +117,8 @@ struct mmc_host_ops { > > > > /* optional callback for HC quirks */ > > void (*init_card)(struct mmc_host *host, struct mmc_card > *card); > > + > > + int (*start_signal_voltage_switch)(struct mmc_host > *host); > > }; > > > > struct mmc_card; > > @@ -173,6 +175,14 @@ struct mmc_host { > > /* DDR mode at 1.2V */ > > #define MMC_CAP_POWER_OFF_CARD (1 << 13) /* Can power off > after boot */ > > #define MMC_CAP_BUS_WIDTH_TEST (1 << 14) /* CMD14/CMD19 bus > width ok */ > > +#define MMC_CAP_UHS_SDR12 (1 << 15) /* Host supports UHS > SDR12 mode */ > > +#define MMC_CAP_UHS_SDR25 (1 << 16) /* Host supports UHS > SDR25 mode */ > > +#define MMC_CAP_UHS_SDR50 (1 << 17) /* Host supports UHS > SDR50 mode */ > > +#define MMC_CAP_UHS_SDR104 (1 << 18) /* Host supports UHS > SDR104 mode */ > > +#define MMC_CAP_UHS_DDR50 (1 << 19) /* Host supports UHS > DDR50 mode */ > > +#define MMC_CAP_SET_XPC_330 (1 << 20) /* Host supports > >150mA current at 3.3V */ > > +#define MMC_CAP_SET_XPC_300 (1 << 21) /* Host supports > >150mA current at 3.0V */ > > +#define MMC_CAP_SET_XPC_180 (1 << 22) /* Host supports > >150mA current at 1.8V */ > > > > mmc_pm_flag_t pm_caps; /* supported pm > features */ > > > > diff --git a/include/linux/mmc/sd.h b/include/linux/mmc/sd.h > > index 178363b..3ba5aa6 100644 > > --- a/include/linux/mmc/sd.h > > +++ b/include/linux/mmc/sd.h > > @@ -17,6 +17,7 @@ > > /* This is basically the same command as for MMC with some quirks. > */ > > #define SD_SEND_RELATIVE_ADDR 3 /* bcr R6 > */ > > #define SD_SEND_IF_COND 8 /* bcr [11:0] See below R7 > */ > > +#define SD_SWITCH_VOLTAGE 11 /* ac R1 > */ > > > > /* class 10 */ > > #define SD_SWITCH 6 /* adtc [31:0] See below R1 > */ > > -- > > 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
