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Message-ID: <96826b51-a980-0c25-f448-78bf726458fd@intel.com>
Date: Tue, 1 Nov 2022 19:13:28 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Victor Shih <victorshihgli@...il.com>, ulf.hansson@...aro.org
Cc: 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, Victor Shih <victor.shih@...esyslogic.com.tw>,
Ben Chuang <ben.chuang@...esyslogic.com.tw>
Subject: Re: [PATCH V5 12/26] mmc: sdhci-uhs2: add set_power() to support vdd2
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@...esyslogic.com.tw>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
> ---
> 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.
> +
> + 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);
}
> + 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
> + } 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 !
> + 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
> +
> + /* 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
> +
> + /*
> + * 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
> + }
> +}
> +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.
>
> #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);
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