> -----Original Message-----
> From: [email protected] [mailto:linux-mmc-
> [email protected]] On Behalf Of Nath, Arindam
> Sent: Thursday, March 10, 2011 2:02 PM
> To: [email protected]; [email protected]
> Cc: [email protected]; [email protected]; linux-
> [email protected]; Su, Henry; Lu, Aaron; [email protected]
> Subject: RE: [PATCH v2 04/12] mmc: sd: add support for driver type
> selection
>
> Hi Subhash,
>
>
> > -----Original Message-----
> > From: [email protected] [mailto:[email protected]]
> > Sent: Thursday, March 10, 2011 12:27 PM
> > To: Nath, Arindam; [email protected]
> > Cc: [email protected]; [email protected]; linux-
> > [email protected]; Su, Henry; Lu, Aaron; [email protected]
> > Subject: RE: [PATCH v2 04/12] mmc: sd: add support for driver type
> > selection
> >
> >
> >
> > > -----Original Message-----
> > > From: [email protected] [mailto:linux-mmc-
> > > [email protected]] On Behalf Of Arindam Nath
> > > Sent: Friday, March 04, 2011 5:03 PM
> > > To: [email protected]
> > > Cc: [email protected]; [email protected];
> > > [email protected]; [email protected];
> [email protected];
> > > [email protected]; [email protected]; Arindam Nath
> > > Subject: [PATCH v2 04/12] mmc: sd: add support for driver type
> > > selection
> > >
> > > This patch adds support for setting driver strength during UHS-I
> > > initialization prcedure. Since UHS-I cards set S18A (bit 24) in
> > > response to ACMD41, we use this as a base for UHS-I initialization.
> > > We modify the parameter list of mmc_sd_get_cid() so that we can
> > > save the ROCR from ACMD41 to check whether bit 24 is set.
> > >
> > > We decide whether the Host Controller supports A, C, or D driver
> > > type depending on the Capabilities register. We then set the
> > > appropriate driver type for the card using CMD6 mode 1. As per
> > > Host Controller spec v3.00, we set driver type for the host only
> > > if Preset Value Enable in the Host Control2 register is not set.
> > > SDHCI_HOST_CONTROL has been renamed to SDHCI_HOST_CONTROL1 to
> > > conform to the spec.
> > >
> > > Signed-off-by: Arindam Nath <[email protected]>
> > > ---
> > > drivers/mmc/core/core.c | 9 +++
> > > drivers/mmc/core/core.h | 1 +
> > > drivers/mmc/core/sd.c | 140
> > +++++++++++++++++++++++++++++++++++++-
> > > --------
> > > drivers/mmc/core/sd.h | 3 +-
> > > drivers/mmc/core/sdio.c | 3 +-
> > > drivers/mmc/host/sdhci.c | 48 ++++++++++++----
> > > drivers/mmc/host/sdhci.h | 10 +++-
> > > include/linux/mmc/card.h | 4 +
> > > include/linux/mmc/host.h | 8 +++
> > > 9 files changed, 186 insertions(+), 40 deletions(-)
> > >
> > > diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> > > index 6625c05..daa535a 100644
> > > --- a/drivers/mmc/core/core.c
> > > +++ b/drivers/mmc/core/core.c
> > > @@ -947,6 +947,15 @@ void mmc_set_timing(struct mmc_host *host,
> > > unsigned int timing)
> > > }
> > >
> > > /*
> > > + * Select appropriate driver type for host.
> > > + */
> > > +void mmc_set_driver_type(struct mmc_host *host, unsigned int
> > drv_type)
> > > +{
> > > + host->ios.drv_type = drv_type;
> > > + mmc_set_ios(host);
> > > +}
> > > +
> > > +/*
> > > * Apply power to the MMC stack. This is a two-stage process.
> > > * First, we enable power to the card without the clock running.
> > > * We then wait a bit for the power to stabilise. Finally,
> > > diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
> > > index ca1fdde..6114ca5 100644
> > > --- a/drivers/mmc/core/core.h
> > > +++ b/drivers/mmc/core/core.h
> > > @@ -42,6 +42,7 @@ void mmc_set_bus_width_ddr(struct mmc_host *host,
> > > unsigned int width,
> > > unsigned int ddr);
> > > u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
> > > void mmc_set_timing(struct mmc_host *host, unsigned int timing);
> > > +void mmc_set_driver_type(struct mmc_host *host, unsigned int
> > > drv_type);
> > >
> > > static inline void mmc_delay(unsigned int ms)
> > > {
> > > diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
> > > index a63956b..f6a4fab 100644
> > > --- a/drivers/mmc/core/sd.c
> > > +++ b/drivers/mmc/core/sd.c
> > > @@ -426,6 +426,86 @@ out:
> > > return err;
> > > }
> > >
> > > +static int sd_select_driver_type(struct mmc_card *card, u8
> *status)
> > > +{
> > > + int host_set_drv_type, card_set_drv_type;
> >
> > Why you need to use *set* in name? Just host_drv_type & card_drv_type
> > is not
> > enough?
>
> I wanted to emphasize on the fact that we are setting the values for
> host and card both. I don't have issues removing the *set* part.
I don't think you need to use *set*.
>
> >
> > > + int err;
> > > +
> > > + /*
> > > + * If the host doesn't support any of the Driver Types A,C or
> D,
> > > + * default Driver Type B is used.
> > > + */
> > > + if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A |
> > > MMC_CAP_DRIVER_TYPE_C
> > > + | MMC_CAP_DRIVER_TYPE_D)))
> > > + return 0;
> > > +
> > > + if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) {
> > > + host_set_drv_type = MMC_SET_DRIVER_TYPE_A;
> > > + if (card->sw_caps.uhs_drv_type & SD_DRIVER_TYPE_A)
> > > + card_set_drv_type = MMC_SET_DRIVER_TYPE_A;
> > > + else if (card->sw_caps.uhs_drv_type & SD_DRIVER_TYPE_C)
> > > + card_set_drv_type = MMC_SET_DRIVER_TYPE_C;
> >
> > Why you are combining TYPE_C under CAP_*_TYPE_A?
>
> Both the host and card can support multiple driver types, so we need to
> decide the appropriate setting for them based on their capabilities.
Agreed but here you are first checking that host is capable of TYPE_A or
not. Then if it's capable of TYPE_A that doesn't guarantee that host is
capable of TYPE_C as well even if card supports both TYPE_A and TYPE_C.
>
> >
> > > + } else if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) {
> > > + host_set_drv_type = MMC_SET_DRIVER_TYPE_C;
> > > + if (card->sw_caps.uhs_drv_type & SD_DRIVER_TYPE_C)
> > > + card_set_drv_type = MMC_SET_DRIVER_TYPE_C;
> > > + }
> >
> > Again TYPE_C checking here? Also why are you skiping TYPE_D here?
>
> TYPE_C checking for the same reason as above. I could not find a
> scenario where I can put TYPE_D into, so there is not checking.
> Probably you can suggest something?
Will following simple check is not enough?
if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) {
host_set_drv_type = MMC_SET_DRIVER_TYPE_A;
if (card->sw_caps.uhs_drv_type & SD_DRIVER_TYPE_A)
card_set_drv_type = MMC_SET_DRIVER_TYPE_A;
} else if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) {
host_set_drv_type = MMC_SET_DRIVER_TYPE_C;
if (card->sw_caps.uhs_drv_type & SD_DRIVER_TYPE_C)
card_set_drv_type = MMC_SET_DRIVER_TYPE_C;
} else if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) {
host_set_drv_type = MMC_SET_DRIVER_TYPE_D;
if (card->sw_caps.uhs_drv_type & SD_DRIVER_TYPE_D)
card_set_drv_type = MMC_SET_DRIVER_TYPE_D;
} else {
return 0; /* default = TYPE_B */
}
>
> >
> > > +
> > > + err = mmc_sd_switch(card, 1, 2, card_set_drv_type, status);
> > > + if (err)
> > > + return err;
> > > +
> > > + if ((status[15] & 0xF) != card_set_drv_type)
> > > + printk(KERN_WARNING "%s: Problem setting driver
> > > strength!\n",
> > > + mmc_hostname(card->host));
> > > + else
> > > + mmc_set_driver_type(card->host, host_set_drv_type);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +/*
> > > + * UHS-I specific initialization procedure
> > > + */
> > > +static int mmc_sd_init_uhs_card(struct mmc_card *card)
> > > +{
> > > + int err;
> > > + u8 *status;
> > > +
> > > + if (!card->scr.sda_spec3)
> > > + return 0;
> > > +
> > > + if (!(card->csd.cmdclass & CCC_SWITCH))
> > > + return 0;
> >
> > We can combine both these check under single "if" checking.
>
> The code snippet is a replica of the code already present in
> mmc_sd_switch_hs() and mmc_read_switch(), so I too followed the same
> checking. I can combine them into a single condition if you want.
Ok. it's up to you in this case. If it looks by having 2 different
statements then it's fine.
>
> >
> > > +
> > > + err = -EIO;
> >
> > Is this really required? I don't think initializing "err" is needed
> > here.
>
> Again a replica of the functions mentioned above. Let me know if you
> want this removed.
This is not needed here. You can remove it.
>
> >
> > > +
> > > + status = kmalloc(64, GFP_KERNEL);
> > > + if (!status) {
> > > + printk(KERN_ERR "%s: could not allocate a buffer for "
> > > + "switch capabilities.\n", mmc_hostname(card-
> >host));
> > > + return -ENOMEM;
> > > + }
> >
> > You may want to allocate memory only after bus width setting is
> > successful.
>
> Yes, good suggestion. I will incorporate this change.
>
> >
> > > +
> > > + /* Set 4-bit bus width */
> > > + if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
> > > + (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
> > > + err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
> > > + if (err)
> > > + goto out;
> > > +
> > > + mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
> > > + }
> > > +
> > > + /* Set the driver strength for the card */
> > > + err = sd_select_driver_type(card, status);
> >
> > Actually why are you allocating memory for "status" response in
> > mmc_sd_init_uhs_card() function. You need "status" only in
> > sd_select_driver_type() function. So you should be allocating memory
> in
> > sd_select_driver_type() function only. here you just say "
> > sd_select_driver_type(card);"
>
> Please check the later patches. "status" is used to store return
> statuses from *bus_speed_mode() and *current_limit() as well. So I
> think it makes sense to allocate memory for "status" at the beginning
> of the function, and use it later.
Sorry. I had not checked the later patches. Yes, allocating here is proper.
As same status is being used for other switch settings as well.
>
> >
> > > +
> > > +out:
> > > + kfree(status);
> > > +
> > > + return err;
> > > +}
> > > +
> > > MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card-
> > > >raw_cid[1],
> > > card->raw_cid[2], card->raw_cid[3]);
> > > MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card-
> > > >raw_csd[1],
> > > @@ -474,10 +554,10 @@ struct device_type sd_type = {
> > > /*
> > > * Fetch CID from card.
> > > */
> > > -int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid)
> > > +int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid,
> > > + u32 *rocr)
> > > {
> > > int err;
> > > - u32 rocr;
> > >
> > > /*
> > > * Since we're changing the OCR value, we seem to
> > > @@ -502,7 +582,7 @@ int mmc_sd_get_cid(struct mmc_host *host, u32
> > ocr,
> > > u32 *cid)
> > > MMC_CAP_SET_XPC_180))
> > > ocr |= 1 << 28;
> > >
> > > - err = mmc_send_app_op_cond(host, ocr, &rocr);
> > > + err = mmc_send_app_op_cond(host, ocr, rocr);
> > > if (err)
> > > return err;
> > >
> > > @@ -510,7 +590,7 @@ int mmc_sd_get_cid(struct mmc_host *host, u32
> > ocr,
> > > u32 *cid)
> > > * 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)) {
> > > + if (!mmc_host_is_spi(host) && rocr && (*rocr & 0x41000000)) {
> >
> > You are not doing NULL check for "rocr" in mmc_send_app_op_cond() but
> > you
> > are doing it here. Is it needed? If "rocr" is NULL then
> > mmc_send_app_op_cond() itself will fail.
>
> I am actually checking rocr for NULL before returning from
> mmc_send_app_op_cond(). Can you please check the function again to make
> sure?
Yes. It's fine. ignore this.
>
> > Also, you may need to check b31 (busy bit) of rocr because spec says
> > this:
> > "Section:4.2.3.1 CCS (Bit 30) and S18A (Bit 24) are valid when Busy
> > (Bit 31)
> > is set to 1."
>
> The busy bit (bit 31) checking is already performed inside
> mmc_send_app_op_cond(), cmd.resp[0] & MMC_CARD_BUSY.
Ok. fine.
>
> >
> > > err = mmc_start_voltage_switch(host);
> > > if (err)
> > > return err;
> > > @@ -643,11 +723,12 @@ static int mmc_sd_init_card(struct mmc_host
> > > *host, u32 ocr,
> > > struct mmc_card *card;
> > > int err;
> > > u32 cid[4];
> > > + u32 rocr;
> > >
> > > BUG_ON(!host);
> > > WARN_ON(!host->claimed);
> > >
> > > - err = mmc_sd_get_cid(host, ocr, cid);
> > > + err = mmc_sd_get_cid(host, ocr, cid, &rocr);
> > > if (err)
> > > return err;
> > >
> > > @@ -700,30 +781,37 @@ static int mmc_sd_init_card(struct mmc_host
> > > *host, u32 ocr,
> > > if (err)
> > > goto free_card;
> > >
> > > - /*
> > > - * Attempt to change to high-speed (if supported)
> > > - */
> > > - err = mmc_sd_switch_hs(card);
> > > - if (err > 0)
> > > - mmc_sd_go_highspeed(card);
> > > - else if (err)
> > > - goto free_card;
> > > -
> > > - /*
> > > - * Set bus speed.
> > > - */
> > > - mmc_set_clock(host, mmc_sd_get_max_clock(card));
> > > -
> > > - /*
> > > - * Switch to wider bus (if supported).
> > > - */
> > > - if ((host->caps & MMC_CAP_4_BIT_DATA) &&
> > > - (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
> > > - err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
> > > + /* Initialization sequence for UHS-I cards */
> > > + if (rocr & 0x01000000) {
> >
> > Instead of 0x01000000, you can use (1 << 24) to be more readable.
>
> I am okay with your suggestion. Will change it.
>
> Thanks,
> Arindam
>
> >
> > > + err = mmc_sd_init_uhs_card(card);
> > > if (err)
> > > goto free_card;
> > > + } else {
> > > + /*
> > > + * Attempt to change to high-speed (if supported)
> > > + */
> > > + err = mmc_sd_switch_hs(card);
> > > + if (err > 0)
> > > + mmc_sd_go_highspeed(card);
> > > + else if (err)
> > > + goto free_card;
> > > +
> > > + /*
> > > + * Set bus speed.
> > > + */
> > > + mmc_set_clock(host, mmc_sd_get_max_clock(card));
> > >
> > > - mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
> > > + /*
> > > + * Switch to wider bus (if supported).
> > > + */
> > > + if ((host->caps & MMC_CAP_4_BIT_DATA) &&
> > > + (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
> > > + err = mmc_app_set_bus_width(card,
> MMC_BUS_WIDTH_4);
> > > + if (err)
> > > + goto free_card;
> > > +
> > > + mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
> > > + }
> > > }
> > >
> > > host->card = card;
> > > diff --git a/drivers/mmc/core/sd.h b/drivers/mmc/core/sd.h
> > > index 3d8800f..5106b44 100644
> > > --- a/drivers/mmc/core/sd.h
> > > +++ b/drivers/mmc/core/sd.h
> > > @@ -5,7 +5,8 @@
> > >
> > > extern struct device_type sd_type;
> > >
> > > -int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid);
> > > +int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid,
> > > + u32 *rocr);
> > > int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card);
> > > void mmc_decode_cid(struct mmc_card *card);
> > > int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card
> *card,
> > > diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> > > index 5c4a54d..6d16684 100644
> > > --- a/drivers/mmc/core/sdio.c
> > > +++ b/drivers/mmc/core/sdio.c
> > > @@ -364,7 +364,8 @@ static int mmc_sdio_init_card(struct mmc_host
> > > *host, u32 ocr,
> > > }
> > >
> > > if (ocr & R4_MEMORY_PRESENT
> > > - && mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid) ==
> 0)
> > > {
> > > + && mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid,
> > > + NULL) == 0) {
> > > card->type = MMC_TYPE_SD_COMBO;
> > >
> > > if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
> > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > > index 5487a0b..1645687 100644
> > > --- a/drivers/mmc/host/sdhci.c
> > > +++ b/drivers/mmc/host/sdhci.c
> > > @@ -63,7 +63,7 @@ static void sdhci_dumpregs(struct sdhci_host
> *host)
> > > sdhci_readw(host, SDHCI_TRANSFER_MODE));
> > > printk(KERN_DEBUG DRIVER_NAME ": Present: 0x%08x | Host ctl:
> > > 0x%08x\n",
> > > sdhci_readl(host, SDHCI_PRESENT_STATE),
> > > - sdhci_readb(host, SDHCI_HOST_CONTROL));
> > > + sdhci_readb(host, SDHCI_HOST_CONTROL1));
> > > printk(KERN_DEBUG DRIVER_NAME ": Power: 0x%08x | Blk gap:
> > > 0x%08x\n",
> > > sdhci_readb(host, SDHCI_POWER_CONTROL),
> > > sdhci_readb(host, SDHCI_BLOCK_GAP_CONTROL));
> > > @@ -216,18 +216,18 @@ static void sdhci_activate_led(struct
> > sdhci_host
> > > *host)
> > > {
> > > u8 ctrl;
> > >
> > > - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> > > + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL1);
> > > ctrl |= SDHCI_CTRL_LED;
> > > - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> > > + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL1);
> > > }
> > >
> > > static void sdhci_deactivate_led(struct sdhci_host *host)
> > > {
> > > u8 ctrl;
> > >
> > > - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> > > + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL1);
> > > ctrl &= ~SDHCI_CTRL_LED;
> > > - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> > > + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL1);
> > > }
> > >
> > > #ifdef SDHCI_USE_LEDS_CLASS
> > > @@ -786,14 +786,14 @@ static void sdhci_prepare_data(struct
> > sdhci_host
> > > *host, struct mmc_data *data)
> > > * is ADMA.
> > > */
> > > if (host->version >= SDHCI_SPEC_200) {
> > > - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> > > + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL1);
> > > ctrl &= ~SDHCI_CTRL_DMA_MASK;
> > > if ((host->flags & SDHCI_REQ_USE_DMA) &&
> > > (host->flags & SDHCI_USE_ADMA))
> > > ctrl |= SDHCI_CTRL_ADMA32;
> > > else
> > > ctrl |= SDHCI_CTRL_SDMA;
> > > - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> > > + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL1);
> > > }
> > >
> > > if (!(host->flags & SDHCI_REQ_USE_DMA)) {
> > > @@ -1252,7 +1252,7 @@ static void sdhci_set_ios(struct mmc_host
> *mmc,
> > > struct mmc_ios *ios)
> > > if (host->ops->platform_8bit_width)
> > > host->ops->platform_8bit_width(host, ios->bus_width);
> > > else {
> > > - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> > > + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL1);
> > > if (ios->bus_width == MMC_BUS_WIDTH_8) {
> > > ctrl &= ~SDHCI_CTRL_4BITBUS;
> > > if (host->version >= SDHCI_SPEC_300)
> > > @@ -1265,10 +1265,10 @@ static void sdhci_set_ios(struct mmc_host
> > *mmc,
> > > struct mmc_ios *ios)
> > > else
> > > ctrl &= ~SDHCI_CTRL_4BITBUS;
> > > }
> > > - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> > > + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL1);
> > > }
> > >
> > > - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> > > + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL1);
> > >
> > > if ((ios->timing == MMC_TIMING_SD_HS ||
> > > ios->timing == MMC_TIMING_MMC_HS)
> > > @@ -1277,7 +1277,25 @@ static void sdhci_set_ios(struct mmc_host
> > *mmc,
> > > struct mmc_ios *ios)
> > > else
> > > ctrl &= ~SDHCI_CTRL_HISPD;
> > >
> > > - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> > > + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL1);
> > > +
> > > + if (host->version >= SDHCI_SPEC_300) {
> > > + u16 ctrl_2;
> > > +
> > > + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> > > + if (!(ctrl_2 & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
> > > + /*
> > > + * We only need to set Driver Strength if the
> > > + * preset value enable is not set.
> > > + */
> > > + if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
> > > + ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
> > > + else if (ios->drv_type ==
> MMC_SET_DRIVER_TYPE_C)
> > > + ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
> > > +
> > > + sdhci_writew(host, ctrl_2,
> SDHCI_HOST_CONTROL2);
> > > + }
> > > + }
> > >
> > > /*
> > > * Some (ENE) controllers go apeshit on some ios operation,
> > > @@ -2037,6 +2055,14 @@ int sdhci_add_host(struct sdhci_host *host)
> > > if (caps[1] & SDHCI_SUPPORT_DDR50)
> > > mmc->caps |= MMC_CAP_UHS_DDR50;
> > >
> > > + /* Driver Type(s) (A, C, D) supported by the host */
> > > + if (caps[1] & SDHCI_DRIVER_TYPE_A)
> > > + mmc->caps |= MMC_CAP_DRIVER_TYPE_A;
> > > + if (caps[1] & SDHCI_DRIVER_TYPE_C)
> > > + mmc->caps |= MMC_CAP_DRIVER_TYPE_C;
> > > + if (caps[1] & SDHCI_DRIVER_TYPE_D)
> > > + mmc->caps |= MMC_CAP_DRIVER_TYPE_D;
> > > +
> > > ocr_avail = 0;
> > > /*
> > > * According to SD Host Controller spec v3.00, if the Host
> System
> > > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> > > index 95d70e6..a407b5b 100644
> > > --- a/drivers/mmc/host/sdhci.h
> > > +++ b/drivers/mmc/host/sdhci.h
> > > @@ -72,7 +72,7 @@
> > > #define SDHCI_DATA_LVL_MASK 0x00F00000
> > > #define SDHCI_DATA_LVL_SHIFT 20
> > >
> > > -#define SDHCI_HOST_CONTROL 0x28
> > > +#define SDHCI_HOST_CONTROL1 0x28
> > > #define SDHCI_CTRL_LED 0x01
> > > #define SDHCI_CTRL_4BITBUS 0x02
> > > #define SDHCI_CTRL_HISPD 0x04
> > > @@ -151,6 +151,11 @@
> > >
> > > #define SDHCI_HOST_CONTROL2 0x3E
> > > #define SDHCI_CTRL_VDD_180 0x0008
> > > +#define SDHCI_CTRL_DRV_TYPE_B 0x0000
> > > +#define SDHCI_CTRL_DRV_TYPE_A 0x0010
> > > +#define SDHCI_CTRL_DRV_TYPE_C 0x0020
> > > +#define SDHCI_CTRL_DRV_TYPE_D 0x0030
> > > +#define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000
> > >
> > > #define SDHCI_CAPABILITIES 0x40
> > > #define SDHCI_TIMEOUT_CLK_MASK 0x0000003F
> > > @@ -174,6 +179,9 @@
> > > #define SDHCI_SUPPORT_SDR50 0x00000001
> > > #define SDHCI_SUPPORT_SDR104 0x00000002
> > > #define SDHCI_SUPPORT_DDR50 0x00000004
> > > +#define SDHCI_DRIVER_TYPE_A 0x00000010
> > > +#define SDHCI_DRIVER_TYPE_C 0x00000020
> > > +#define SDHCI_DRIVER_TYPE_D 0x00000040
> > >
> > > #define SDHCI_CAPABILITIES_1 0x44
> > >
> > > diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> > > index 7080f22..2d7f7a3 100644
> > > --- a/include/linux/mmc/card.h
> > > +++ b/include/linux/mmc/card.h
> > > @@ -77,6 +77,10 @@ struct sd_switch_caps {
> > > unsigned int hs_max_dtr;
> > > unsigned int uhs_bus_mode;
> > > unsigned int uhs_drv_type;
> > > +#define SD_DRIVER_TYPE_B 0x01
> > > +#define SD_DRIVER_TYPE_A 0x02
> > > +#define SD_DRIVER_TYPE_C 0x04
> > > +#define SD_DRIVER_TYPE_D 0x08
> > > unsigned int uhs_curr_limit;
> > > };
> > >
> > > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> > > index ad7daa3..bc2121e 100644
> > > --- a/include/linux/mmc/host.h
> > > +++ b/include/linux/mmc/host.h
> > > @@ -56,6 +56,11 @@ struct mmc_ios {
> > > #define MMC_SDR_MODE 0
> > > #define MMC_1_2V_DDR_MODE 1
> > > #define MMC_1_8V_DDR_MODE 2
> > > +
> > > + unsigned char drv_type; /* driver type (A, C,
> D) */
> > > +
> > > +#define MMC_SET_DRIVER_TYPE_A 1
> > > +#define MMC_SET_DRIVER_TYPE_C 2
> >
> > *SET* is not required in name. again why are we ignoring TYPE D here?
> >
> > > };
> > >
> > > struct mmc_host_ops {
> > > @@ -183,6 +188,9 @@ struct mmc_host {
> > > #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 */
> > > +#define MMC_CAP_DRIVER_TYPE_A (1 << 23) /* Host
> supports
> > Driver
> > > Type A */
> > > +#define MMC_CAP_DRIVER_TYPE_C (1 << 24) /* Host
> supports
> > Driver
> > > Type C */
> > > +#define MMC_CAP_DRIVER_TYPE_D (1 << 25) /* Host
> supports
> > Driver
> > > Type D */
> > >
> > > mmc_pm_flag_t pm_caps; /* supported pm
> features */
> > >
> > > --
> > > 1.7.1
> > >
> > > --
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> > in
> > > the body of a message to [email protected]
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> >
>
>
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