Re: [PATCH V5 12/26] mmc: sdhci-uhs2: add set_power() to support vdd2

From: Victor Shih
Date: Tue Dec 13 2022 - 03:46:44 EST

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Hi, Adrian

On Wed, Nov 2, 2022 at 1:13 AM Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote:
>
> On 19/10/22 14:06, Victor Shih wrote:
> > This is a UHS-II version of sdhci's set_power operation.
> > VDD2, as well as VDD, is handled here.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> > Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
> > ---
> > drivers/mmc/host/sdhci-uhs2.c | 79 +++++++++++++++++++++++++++++++++++
> > drivers/mmc/host/sdhci-uhs2.h | 2 +
> > drivers/mmc/host/sdhci.c | 66 ++++++++++++++++-------------
> > drivers/mmc/host/sdhci.h | 2 +
> > 4 files changed, 120 insertions(+), 29 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > index 0e82f98d1967..896a1c8e55cf 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.c
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -117,6 +117,85 @@ void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask)
> > }
> > EXPORT_SYMBOL_GPL(sdhci_uhs2_reset);
> >
> > +void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
> > + unsigned short vdd)
> > +{
> > + struct mmc_host *mmc = host->mmc;
> > + u8 pwr;
> > +
> > + /* FIXME: check if flags & MMC_UHS2_SUPPORT? */
> > + if (!(sdhci_uhs2_mode(host))) {
> > + sdhci_set_power(host, mode, vdd);
> > + return;
> > + }
>
> sdhci_uhs2_set_power() is called via ->uhs2_set_ios(). That should
> not be called if not in UHS2 mode, so no check should be needed here.
>
>

I will update it in the patch#11 of the new [PATCH V6].

> > +
> > + if (mode != MMC_POWER_OFF) {
> > + pwr = sdhci_get_vdd_value(vdd);
> > + if (!pwr)
> > + WARN(1, "%s: Invalid vdd %#x\n",
> > + mmc_hostname(host->mmc), vdd);
> > + pwr |= SDHCI_VDD2_POWER_180;
> > + }
> > +
> > + if (host->pwr == pwr)
> > + return;
> > + host->pwr = pwr;
> > +
> > + if (pwr == 0) {
> > + sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
> > +
> > + if (!IS_ERR(host->mmc->supply.vmmc))
> > + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
>
> Seems to be a common if-clause. Looks like we could use a
> helper like:
>
> static inline int mmc_opt_regulator_set_ocr(struct mmc_host *mmc,
> struct regulator *supply,
> unsigned short vdd_bit)
> {
> return IS_ERR_OR_NULL(supply) ? 0 : mmc_regulator_set_ocr(mmc, supply, vdd_bit);
> }
>
>

I will update it in the patch#11 of the new [PATCH V6].

> > + if (!IS_ERR_OR_NULL(host->mmc->supply.vmmc2))
> > + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc2, 0);
> > +
> > + if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
> > + sdhci_runtime_pm_bus_off(host);
>
> Let's not support quirks that you don't need like
> SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON
>

I will update it in the patch#11 of the new [PATCH V6].

> > + } else {
> > + if (!IS_ERR(host->mmc->supply.vmmc))
> > + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
> > + if (!IS_ERR_OR_NULL(host->mmc->supply.vmmc2))
> > + /* support 1.8v only for now */
> > + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc2,
> > + fls(MMC_VDD2_165_195) - 1);
> > +
> > + /*
> > + * Spec says that we should clear the power reg before setting
> > + * a new value. Some controllers don't seem to like this though.
> > + */
> > + if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
>
> Let's not support quirks that you don't need like
> SDHCI_QUIRK_SINGLE_POWER_WRITE
> note this one is !
>

I will update it in the patch#11 of the new [PATCH V6].

> > + sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
> > +
> > + /*
> > + * At least the Marvell CaFe chip gets confused if we set the
> > + * voltage and set turn on power at the same time, so set the
> > + * voltage first.
> > + */
> > + if (host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER)
> > + sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
>
> Let's not support quirks that you don't need like
> SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER
>

I will update it in the patch#11 of the new [PATCH V6].

> > +
> > + /* vdd first */
> > + pwr |= SDHCI_POWER_ON;
> > + sdhci_writeb(host, pwr & 0xf, SDHCI_POWER_CONTROL);
> > + mdelay(5);
> > +
> > + pwr |= SDHCI_VDD2_POWER_ON;
> > + sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
> > + mdelay(5);
> > +
> > + if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
> > + sdhci_runtime_pm_bus_on(host);
>
> Let's not support quirks that you don't need like
> SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON
>

I will update it in the patch#11 of the new [PATCH V6].

> > +
> > + /*
> > + * Some controllers need an extra 10ms delay of 10ms before
> > + * they can apply clock after applying power
> > + */
> > + if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
> > + mdelay(10);
>
> Let's not support quirks that you don't need like
> SDHCI_QUIRK_DELAY_AFTER_POWER
>

I will update it in the patch#11 of the new [PATCH V6].

> > + }
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);
>
> It is only used in this file, so let's not export it.
>
> > +
> > /*****************************************************************************\
> > * *
> > * Driver init/exit *
> > diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
> > index 31776dcca5cf..3179915f7f79 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.h
> > +++ b/drivers/mmc/host/sdhci-uhs2.h
> > @@ -213,5 +213,7 @@ struct sdhci_host;
> > void sdhci_uhs2_dump_regs(struct sdhci_host *host);
> > bool sdhci_uhs2_mode(struct sdhci_host *host);
> > void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);
> > +void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode,
> > + unsigned short vdd);
>
> Let's not export it for now.
>

I will update it in the patch#11 of the new [PATCH V6].

> >
> > #endif /* __SDHCI_UHS2_H */
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index bd017c59a020..dfa0939a9058 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -23,7 +23,7 @@
> > #include <linux/regulator/consumer.h>
> > #include <linux/pm_runtime.h>
> > #include <linux/of.h>
> > -
> > +#include <linux/bug.h>
> > #include <linux/leds.h>
> >
> > #include <linux/mmc/mmc.h>
> > @@ -186,13 +186,14 @@ static void sdhci_disable_card_detection(struct sdhci_host *host)
> > sdhci_set_card_detection(host, false);
> > }
> >
> > -static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
> > +void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
> > {
> > if (host->bus_on)
> > return;
> > host->bus_on = true;
> > pm_runtime_get_noresume(mmc_dev(host->mmc));
> > }
> > +EXPORT_SYMBOL_GPL(sdhci_runtime_pm_bus_on);
> >
> > void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
> > {
> > @@ -2071,41 +2072,48 @@ static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
> > sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
> > }
> >
> > +unsigned short sdhci_get_vdd_value(unsigned short vdd)
> > +{
> > + u8 pwr;
> > +
> > + switch (1 << vdd) {
> > + case MMC_VDD_165_195:
> > + /*
> > + * Without a regulator, SDHCI does not support 2.0v
> > + * so we only get here if the driver deliberately
> > + * added the 2.0v range to ocr_avail. Map it to 1.8v
> > + * for the purpose of turning on the power.
> > + */
> > + case MMC_VDD_20_21:
> > + pwr = SDHCI_POWER_180;
> > + break;
> > + case MMC_VDD_29_30:
> > + case MMC_VDD_30_31:
> > + pwr = SDHCI_POWER_300;
> > + break;
> > + case MMC_VDD_32_33:
> > + case MMC_VDD_33_34:
> > + pwr = SDHCI_POWER_330;
> > + break;
> > + default:
> > + pwr = 0;
> > + break;
> > + }
> > +
> > + return pwr;
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_get_vdd_value);
> > +
> > void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
> > unsigned short vdd)
> > {
> > u8 pwr = 0;
> >
> > if (mode != MMC_POWER_OFF) {
> > - switch (1 << vdd) {
> > - case MMC_VDD_165_195:
> > - /*
> > - * Without a regulator, SDHCI does not support 2.0v
> > - * so we only get here if the driver deliberately
> > - * added the 2.0v range to ocr_avail. Map it to 1.8v
> > - * for the purpose of turning on the power.
> > - */
> > - case MMC_VDD_20_21:
> > - pwr = SDHCI_POWER_180;
> > - break;
> > - case MMC_VDD_29_30:
> > - case MMC_VDD_30_31:
> > - pwr = SDHCI_POWER_300;
> > - break;
> > - case MMC_VDD_32_33:
> > - case MMC_VDD_33_34:
> > - /*
> > - * 3.4 ~ 3.6V are valid only for those platforms where it's
> > - * known that the voltage range is supported by hardware.
> > - */
> > - case MMC_VDD_34_35:
> > - case MMC_VDD_35_36:
> > - pwr = SDHCI_POWER_330;
> > - break;
> > - default:
> > + pwr = sdhci_get_vdd_value(vdd);
> > + if (!pwr) {
> > WARN(1, "%s: Invalid vdd %#x\n",
> > mmc_hostname(host->mmc), vdd);
> > - break;
> > }
> > }
> >
> > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> > index 28716105da61..c34ca6ffbff6 100644
> > --- a/drivers/mmc/host/sdhci.h
> > +++ b/drivers/mmc/host/sdhci.h
> > @@ -850,6 +850,7 @@ static inline void sdhci_read_caps(struct sdhci_host *host)
> > __sdhci_read_caps(host, NULL, NULL, NULL);
> > }
> >
> > +void sdhci_runtime_pm_bus_on(struct sdhci_host *host);
> > void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
> > u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
> > unsigned int *actual_clock);
> > @@ -860,6 +861,7 @@ void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
> > void sdhci_set_power_and_bus_voltage(struct sdhci_host *host,
> > unsigned char mode,
> > unsigned short vdd);
> > +unsigned short sdhci_get_vdd_value(unsigned short vdd);
> > void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
> > unsigned short vdd);
> > int sdhci_get_cd_nogpio(struct mmc_host *mmc);
>

Thanks, Victor Shih

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