On Fri 20 Apr 05:15 PDT 2018, Vijay Viswanath wrote: > The PADs for SD card are dual-voltage that support 3v/1.8v. Those PADs > have a control signal (io_pad_pwr_switch/mode18 ) that indicates > whether the PAD works in 3v or 1.8v. > > SDHC core on msm platforms should have IO_PAD_PWR_SWITCH bit set/unset > based on actual voltage used for IO lines. So when power irq is > triggered for io high or io low, the driver should check the voltages > supported and set the pad accordingly. > > Signed-off-by: Krishna Konda <[email protected]> > Signed-off-by: Venkat Gopalakrishnan <[email protected]> > Signed-off-by: Vijay Viswanath <[email protected]> > Reviewed-by: Douglas Anderson <[email protected]>
Acked-by: Bjorn Andersson <[email protected]> Regards, Bjorn > --- > drivers/mmc/host/sdhci-msm.c | 57 > ++++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 55 insertions(+), 2 deletions(-) > > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c > index edd30a2..bb11916 100644 > --- a/drivers/mmc/host/sdhci-msm.c > +++ b/drivers/mmc/host/sdhci-msm.c > @@ -78,12 +78,15 @@ > #define CORE_HC_MCLK_SEL_DFLT (2 << 8) > #define CORE_HC_MCLK_SEL_HS400 (3 << 8) > #define CORE_HC_MCLK_SEL_MASK (3 << 8) > +#define CORE_IO_PAD_PWR_SWITCH_EN (1 << 15) > +#define CORE_IO_PAD_PWR_SWITCH (1 << 16) > #define CORE_HC_SELECT_IN_EN BIT(18) > #define CORE_HC_SELECT_IN_HS400 (6 << 19) > #define CORE_HC_SELECT_IN_MASK (7 << 19) > > #define CORE_3_0V_SUPPORT (1 << 25) > #define CORE_1_8V_SUPPORT (1 << 26) > +#define CORE_VOLT_SUPPORT (CORE_3_0V_SUPPORT | CORE_1_8V_SUPPORT) > > #define CORE_CSR_CDC_CTLR_CFG0 0x130 > #define CORE_SW_TRIG_FULL_CALIB BIT(16) > @@ -1109,7 +1112,7 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host > *host, int irq) > u32 irq_status, irq_ack = 0; > int retry = 10; > u32 pwr_state = 0, io_level = 0; > - > + u32 config; > > irq_status = readl_relaxed(msm_host->core_mem + CORE_PWRCTL_STATUS); > irq_status &= INT_MASK; > @@ -1166,6 +1169,38 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host > *host, int irq) > */ > writel_relaxed(irq_ack, msm_host->core_mem + CORE_PWRCTL_CTL); > > + /* > + * If we don't have info regarding the voltage levels supported by > + * regulators, don't change the IO PAD PWR SWITCH. > + */ > + if (msm_host->caps_0 & CORE_VOLT_SUPPORT) { > + u32 new_config; > + /* > + * We should unset IO PAD PWR switch only if the register write > + * can set IO lines high and the regulator also switches to 3 V. > + * Else, we should keep the IO PAD PWR switch set. > + * This is applicable to certain targets where eMMC vccq supply > + * is only 1.8V. In such targets, even during REQ_IO_HIGH, the > + * IO PAD PWR switch must be kept set to reflect actual > + * regulator voltage. This way, during initialization of > + * controllers with only 1.8V, we will set the IO PAD bit > + * without waiting for a REQ_IO_LOW. > + */ > + config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC); > + new_config = config; > + > + if ((io_level & REQ_IO_HIGH) && > + (msm_host->caps_0 & CORE_3_0V_SUPPORT)) > + new_config &= ~CORE_IO_PAD_PWR_SWITCH; > + else if ((io_level & REQ_IO_LOW) || > + (msm_host->caps_0 & CORE_1_8V_SUPPORT)) > + new_config |= CORE_IO_PAD_PWR_SWITCH; > + > + if (config ^ new_config) > + writel_relaxed(new_config, > + host->ioaddr + CORE_VENDOR_SPEC); > + } > + > if (pwr_state) > msm_host->curr_pwr_state = pwr_state; > if (io_level) > @@ -1322,7 +1357,8 @@ static void sdhci_msm_set_regulator_caps(struct > sdhci_msm_host *msm_host) > { > struct mmc_host *mmc = msm_host->mmc; > struct regulator *supply = mmc->supply.vqmmc; > - u32 caps = 0; > + u32 caps = 0, config; > + struct sdhci_host *host = mmc_priv(mmc); > > if (!IS_ERR(mmc->supply.vqmmc)) { > if (regulator_is_supported_voltage(supply, 1700000, 1950000)) > @@ -1335,6 +1371,23 @@ static void sdhci_msm_set_regulator_caps(struct > sdhci_msm_host *msm_host) > mmc_hostname(mmc)); > } > > + if (caps) { > + /* > + * Set the PAD_PWR_SWITCH_EN bit so that the PAD_PWR_SWITCH > + * bit can be used as required later on. > + */ > + u32 io_level = msm_host->curr_io_level; > + > + config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC); > + config |= CORE_IO_PAD_PWR_SWITCH_EN; > + > + if ((io_level & REQ_IO_HIGH) && (caps & CORE_3_0V_SUPPORT)) > + config &= ~CORE_IO_PAD_PWR_SWITCH; > + else if ((io_level & REQ_IO_LOW) || (caps & CORE_1_8V_SUPPORT)) > + config |= CORE_IO_PAD_PWR_SWITCH; > + > + writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC); > + } > msm_host->caps_0 |= caps; > pr_debug("%s: supported caps: 0x%08x\n", mmc_hostname(mmc), caps); > } > -- > Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, > Inc. > Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux > Foundation Collaborative Project. >
