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Date: Sun, 22 Apr 2018 10:26:23 -0700
From: Bjorn Andersson <bjorn.andersson@...aro.org>
To: Vijay Viswanath <vviswana@...eaurora.org>
Cc: adrian.hunter@...el.com, ulf.hansson@...aro.org,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
shawn.lin@...k-chips.com, linux-arm-msm@...r.kernel.org,
georgi.djakov@...aro.org, asutoshd@...eaurora.org,
stummala@...eaurora.org, venkatg@...eaurora.org,
pramod.gurav@...aro.org, jeremymc@...hat.com,
riteshh@...eaurora.org, vbadigan@...eaurora.org,
Krishna Konda <kkonda@...eaurora.org>
Subject: Re: [PATCH V5 2/2] mmc: sdhci-msm: support voltage pad switching
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 <kkonda@...eaurora.org>
> Signed-off-by: Venkat Gopalakrishnan <venkatg@...eaurora.org>
> Signed-off-by: Vijay Viswanath <vviswana@...eaurora.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>
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.
>
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