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Date: Fri, 21 Aug 2020 17:11:18 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Ben Chuang <benchuanggli@...il.com>, ulf.hansson@...aro.org
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
ben.chuang@...esyslogic.com.tw, takahiro.akashi@...aro.org,
greg.tu@...esyslogic.com.tw
Subject: Re: [RFC PATCH V3 15/21] mmc: sdhci: UHS-II support, modify
set_power() to handle vdd2
On 10/07/20 2:11 pm, Ben Chuang wrote:
> From: AKASHI Takahiro <takahiro.akashi@...aro.org>
>
> VDD2 is used for powering UHS-II interface.
> Modify sdhci_set_power_and_bus_voltage(), sdhci_set_power_noreg()
> and sdhci_set_power_noreg() to handle VDD2.
vdd2 is always 1.8 V and I suspect there may never be support for anything
else, so we should start with 1.8 V only.
Also can we create uhs2_set_power_reg() and uhs2_set_power_noreg() and use
the existing ->set_power() callback
>
> Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> ---
> drivers/mmc/host/sdhci-omap.c | 2 +-
> drivers/mmc/host/sdhci-pci-core.c | 4 +--
> drivers/mmc/host/sdhci-pxav3.c | 4 +--
> drivers/mmc/host/sdhci-xenon.c | 4 +--
> drivers/mmc/host/sdhci.c | 42 ++++++++++++++++++++++++-------
> drivers/mmc/host/sdhci.h | 9 +++----
> 6 files changed, 43 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
> index 1ec74c2d5c17..1926585debe5 100644
> --- a/drivers/mmc/host/sdhci-omap.c
> +++ b/drivers/mmc/host/sdhci-omap.c
> @@ -678,7 +678,7 @@ static void sdhci_omap_set_clock(struct sdhci_host *host, unsigned int clock)
> }
>
> static void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode,
> - unsigned short vdd)
> + unsigned short vdd, unsigned short vdd2)
> {
> struct mmc_host *mmc = host->mmc;
>
> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
> index bb6802448b2f..40f5a24a8982 100644
> --- a/drivers/mmc/host/sdhci-pci-core.c
> +++ b/drivers/mmc/host/sdhci-pci-core.c
> @@ -629,12 +629,12 @@ static int bxt_get_cd(struct mmc_host *mmc)
> #define SDHCI_INTEL_PWR_TIMEOUT_UDELAY 100
>
> static void sdhci_intel_set_power(struct sdhci_host *host, unsigned char mode,
> - unsigned short vdd)
> + unsigned short vdd, unsigned short vdd2)
> {
> int cntr;
> u8 reg;
>
> - sdhci_set_power(host, mode, vdd);
> + sdhci_set_power(host, mode, vdd, -1);
>
> if (mode == MMC_POWER_OFF)
> return;
> diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
> index e55037ceda73..457e9425339a 100644
> --- a/drivers/mmc/host/sdhci-pxav3.c
> +++ b/drivers/mmc/host/sdhci-pxav3.c
> @@ -298,12 +298,12 @@ static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
> }
>
> static void pxav3_set_power(struct sdhci_host *host, unsigned char mode,
> - unsigned short vdd)
> + unsigned short vdd, unsigned short vdd2)
> {
> struct mmc_host *mmc = host->mmc;
> u8 pwr = host->pwr;
>
> - sdhci_set_power_noreg(host, mode, vdd);
> + sdhci_set_power_noreg(host, mode, vdd, -1);
>
> if (host->pwr == pwr)
> return;
> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> index 4703cd540c7f..2b0ebb91895a 100644
> --- a/drivers/mmc/host/sdhci-xenon.c
> +++ b/drivers/mmc/host/sdhci-xenon.c
> @@ -214,12 +214,12 @@ static void xenon_set_uhs_signaling(struct sdhci_host *host,
> }
>
> static void xenon_set_power(struct sdhci_host *host, unsigned char mode,
> - unsigned short vdd)
> + unsigned short vdd, unsigned short vdd2)
> {
> struct mmc_host *mmc = host->mmc;
> u8 pwr = host->pwr;
>
> - sdhci_set_power_noreg(host, mode, vdd);
> + sdhci_set_power_noreg(host, mode, vdd, -1);
>
> if (host->pwr == pwr)
> return;
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index d38d734ec83f..ca3d4a506e01 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2089,12 +2089,15 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> EXPORT_SYMBOL_GPL(sdhci_set_clock);
>
> static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
> - unsigned short vdd)
> + unsigned short vdd, unsigned short vdd2)
> {
> struct mmc_host *mmc = host->mmc;
>
> mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
>
> + if (mmc->caps & MMC_CAP_UHS2 && !IS_ERR(mmc->supply.vmmc2))
> + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc2, vdd2);
> +
> if (mode != MMC_POWER_OFF)
> sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
> else
> @@ -2102,7 +2105,7 @@ static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
> }
>
> void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
> - unsigned short vdd)
> + unsigned short vdd, unsigned short vdd2)
> {
> u8 pwr = 0;
>
> @@ -2133,6 +2136,20 @@ void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
> }
> }
>
> + if (mode != MMC_POWER_OFF) {
> + if (vdd2 != (unsigned short)-1) {
> + switch (1 << vdd2) {
> + case MMC_VDD2_165_195:
> + pwr |= SDHCI_VDD2_POWER_180;
> + break;
> + default:
> + WARN(1, "%s: Invalid vdd2 %#x\n",
> + mmc_hostname(host->mmc), vdd2);
> + break;
> + }
> + }
> + }
> +
> if (host->pwr == pwr)
> return;
>
> @@ -2159,7 +2176,13 @@ void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
> sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
>
> pwr |= SDHCI_POWER_ON;
> + if (vdd2 != (unsigned short)-1)
> + pwr |= SDHCI_VDD2_POWER_ON;
> +
> + sdhci_writeb(host, pwr & 0xf, SDHCI_POWER_CONTROL);
> + mdelay(5);
> 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);
> @@ -2175,12 +2198,12 @@ void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
> EXPORT_SYMBOL_GPL(sdhci_set_power_noreg);
>
> void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
> - unsigned short vdd)
> + unsigned short vdd, unsigned short vdd2)
> {
> if (IS_ERR(host->mmc->supply.vmmc))
> - sdhci_set_power_noreg(host, mode, vdd);
> + sdhci_set_power_noreg(host, mode, vdd, vdd2);
> else
> - sdhci_set_power_reg(host, mode, vdd);
> + sdhci_set_power_reg(host, mode, vdd, vdd2);
> }
> EXPORT_SYMBOL_GPL(sdhci_set_power);
>
> @@ -2192,14 +2215,15 @@ EXPORT_SYMBOL_GPL(sdhci_set_power);
> */
> void sdhci_set_power_and_bus_voltage(struct sdhci_host *host,
> unsigned char mode,
> - unsigned short vdd)
> + unsigned short vdd,
> + unsigned short vdd2)
> {
> if (!IS_ERR(host->mmc->supply.vmmc)) {
> struct mmc_host *mmc = host->mmc;
>
> mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
> }
> - sdhci_set_power_noreg(host, mode, vdd);
> + sdhci_set_power_noreg(host, mode, vdd, -1);
> }
> EXPORT_SYMBOL_GPL(sdhci_set_power_and_bus_voltage);
>
> @@ -2377,9 +2401,9 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> }
>
> if (host->ops->set_power)
> - host->ops->set_power(host, ios->power_mode, ios->vdd);
> + host->ops->set_power(host, ios->power_mode, ios->vdd, -1);
> else
> - sdhci_set_power(host, ios->power_mode, ios->vdd);
> + sdhci_set_power(host, ios->power_mode, ios->vdd, -1);
>
> /* 4.0 host support */
> if (host->version >= SDHCI_SPEC_400) {
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index ecf55394ea46..f6732f33f29f 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -689,7 +689,7 @@ struct sdhci_ops {
>
> void (*set_clock)(struct sdhci_host *host, unsigned int clock);
> void (*set_power)(struct sdhci_host *host, unsigned char mode,
> - unsigned short vdd);
> + unsigned short vdd, unsigned short vdd2);
>
> u32 (*irq)(struct sdhci_host *host, u32 intmask);
>
> @@ -852,13 +852,10 @@ u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
> unsigned int *actual_clock);
> void sdhci_set_clock(struct sdhci_host *host, unsigned int clock);
> void sdhci_enable_clk(struct sdhci_host *host, u16 clk);
> -void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
> - unsigned short vdd);
> void sdhci_set_power_and_bus_voltage(struct sdhci_host *host,
> unsigned char mode,
> - unsigned short vdd);
> -void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
> - unsigned short vdd);
> + unsigned short vdd,
> + unsigned short vdd2);
> void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq);
> int sdhci_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq);
> void sdhci_set_bus_width(struct sdhci_host *host, int width);
>
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