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Message-ID: <CAK00qKBc8zxLHFjO1pfSQaVY-irBQRDJmsusNoWV+bW0iG_myQ@mail.gmail.com>
Date: Mon, 8 Jan 2024 18:45:34 +0800
From: Victor Shih <victorshihgli@...il.com>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: ulf.hansson@...aro.org, linux-mmc@...r.kernel.org,
linux-kernel@...r.kernel.org, benchuanggli@...il.com,
HL.Liu@...esyslogic.com.tw, Greg.tu@...esyslogic.com.tw,
takahiro.akashi@...aro.org, dlunev@...omium.org,
Ben Chuang <ben.chuang@...esyslogic.com.tw>,
Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: Re: [PATCH V13 12/21] mmc: sdhci-uhs2: add set_power() to support vdd2
On Tue, Nov 28, 2023 at 5:12 PM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> On 17/11/23 13:31, Victor Shih wrote:
> > From: Victor Shih <victor.shih@...esyslogic.com.tw>
> >
> > This is a UHS-II version of sdhci's set_power operation.
> > Use sdhci_uhs2_set_power() to set VDD2 for support UHS2 interface.
> > VDD2, as well as VDD, is handled here.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> > Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
> > ---
> >
> > Updates in V13:
> > - Drop use vmmc2.
> > - Modify comment message.
> >
> > Updates in V10:
> > - Move some definitions of PatchV9[05/23] to PatchV10[11/23].
> >
> > Updates in V9:
> > - Modify annotations in sdhci_get_vdd_value().
> >
> > Updates in V8:
> > - Adjust the position of matching brackets.
> > - Add the initial value of the pwr in sdhci_uhs2_set_power().
> >
> > Updates in V7:
> > - Add clear the power reg before setting a new value
> > in sdhci_uhs2_set_power().
> > - Add MMC_VDD_34_35 case and MMC_VDD_35_36 case in sdhci_get_vdd_value().
> > - Drop pwr variable in sdhci_get_vdd_value().
> >
> > Updates in V6:
> > - Add mmc_opt_regulator_set_ocr().
> > - Remove unnecessary functions.
> >
> > ---
> > drivers/mmc/host/sdhci-uhs2.c | 48 +++++++++++++++++++++++++++
> > drivers/mmc/host/sdhci.c | 61 +++++++++++++++++++----------------
> > drivers/mmc/host/sdhci.h | 1 +
> > 3 files changed, 82 insertions(+), 28 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > index 066549526060..7d5070f58d00 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.c
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -59,6 +59,13 @@ EXPORT_SYMBOL_GPL(sdhci_uhs2_dump_regs);
> > * *
> > \*****************************************************************************/
> >
> > +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);
> > +}
> > +
> > bool sdhci_uhs2_mode(struct sdhci_host *host)
> > {
> > return host->mmc->ios.timing == MMC_TIMING_UHS2_SPEED_A ||
> > @@ -94,6 +101,47 @@ void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask)
> > }
> > EXPORT_SYMBOL_GPL(sdhci_uhs2_reset);
> >
> > +static void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, unsigned short vdd)
> > +{
> > + struct mmc_host *mmc = host->mmc;
> > + u8 pwr = 0;
> > +
> > + 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);
> > +
> > + mmc_opt_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> > + mmc_regulator_set_vqmmc2(mmc, &mmc->ios);
>
> mmc_regulator_set_vqmmc2() only sets the voltage, it doesn't
> disable the regulator.
>
Hi, Ulf
Would you have any idea about using the mmc_regulator_set_vqmmc2()
to disable the regulator?
Thanks, Victor Shih
> > + } else {
> > + mmc_opt_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
> > + /* support 1.8v only for now */
> > + mmc_regulator_set_vqmmc2(mmc, &mmc->ios);
> > +
> > + /* Clear the power reg before setting a new value */
> > + sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
> > +
> > + /* 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);
> > + }
> > +}
> > +
> > /*****************************************************************************\
> > * *
> > * Driver init/exit *
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index 27ea5b875c29..4d50cac7717d 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>
> > @@ -2061,41 +2061,46 @@ 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)
> > +{
> > + 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:
> > + return SDHCI_POWER_180;
> > + case MMC_VDD_29_30:
> > + case MMC_VDD_30_31:
> > + return SDHCI_POWER_300;
> > + case MMC_VDD_32_33:
> > + case MMC_VDD_33_34:
> > + /*
> > + * 3.4V ~ 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:
> > + return SDHCI_POWER_330;
> > + default:
> > + return 0;
> > + }
> > +}
> > +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 782c399fae15..cdb418d97c4d 100644
> > --- a/drivers/mmc/host/sdhci.h
> > +++ b/drivers/mmc/host/sdhci.h
> > @@ -837,6 +837,7 @@ 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);
>
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