Re: [PATCH RFC 2/2] mmc: sdhci-msm: Use internal voltage control

From: Adrian Hunter
Date: Tue Jul 10 2018 - 07:28:55 EST

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On 21/06/18 15:23, Vijay Viswanath wrote:
> Some sdhci-msm controllers require that voltage switching be done after
> the HW is ready for it. The HW informs its readiness through power irq.
> The voltage switching should happen only then.
>
> Use the quirk for internal voltage switching and then control the
> voltage switching using power irq.
>
> Signed-off-by: Vijay Viswanath <vviswana@xxxxxxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-msm.c | 99 ++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 87 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index a0dc3e1..ebdde29 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -43,7 +43,9 @@
> #define CORE_PWRCTL_IO_LOW BIT(2)
> #define CORE_PWRCTL_IO_HIGH BIT(3)
> #define CORE_PWRCTL_BUS_SUCCESS BIT(0)
> +#define CORE_PWRCTL_BUS_FAIL BIT(1)
> #define CORE_PWRCTL_IO_SUCCESS BIT(2)
> +#define CORE_PWRCTL_IO_FAIL BIT(3)
> #define REQ_BUS_OFF BIT(0)
> #define REQ_BUS_ON BIT(1)
> #define REQ_IO_LOW BIT(2)
> @@ -258,6 +260,7 @@ struct sdhci_msm_host {
> bool mci_removed;
> const struct sdhci_msm_variant_ops *var_ops;
> const struct sdhci_msm_offset *offset;
> + bool pltfm_init_done;

Wouldn't hurt to explain what 'pltfm_init_done' is for

> };
>
> static const struct sdhci_msm_offset *sdhci_priv_msm_offset(struct sdhci_host *host)
> @@ -1314,8 +1317,9 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + struct mmc_host *mmc = host->mmc;
> u32 irq_status, irq_ack = 0;
> - int retry = 10;
> + int retry = 10, ret = 0;
> u32 pwr_state = 0, io_level = 0;
> u32 config;
> const struct sdhci_msm_offset *msm_offset = msm_host->offset;
> @@ -1351,14 +1355,59 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
>
> /* Handle BUS ON/OFF*/
> if (irq_status & CORE_PWRCTL_BUS_ON) {
> - pwr_state = REQ_BUS_ON;
> - io_level = REQ_IO_HIGH;
> - irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> + if (mmc->supply.vmmc) {

Since you call mmc_regulator_get_supply() first, mmc->supply.vmmc will never
be NULL. Did you mean:

if (!IS_ERR(mmc->supply.vmmc))

> + ret = regulator_set_load(mmc->supply.vmmc, 800000);
> + ret |= mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
> + mmc->ios.vdd);
> + if (ret)
> + pr_err("%s: vmmc enable failed: %d\n",
> + mmc_hostname(mmc), ret);
> + }
> + if (mmc->supply.vqmmc && !ret) {

Ditto for mmc->supply.vqmmc

> + ret = regulator_set_load(mmc->supply.vqmmc, 22000);
> + ret |= mmc_regulator_set_ocr(mmc, mmc->supply.vqmmc,
> + mmc->ios.vdd);
> + if (!ret)
> + ret = regulator_enable(mmc->supply.vqmmc);
> + if (ret)
> + pr_err("%s: vqmmc enable failed: %d\n",
> + mmc_hostname(mmc), ret);
> + }
> + if (!ret) {
> + pwr_state = REQ_BUS_ON;
> + io_level = REQ_IO_HIGH;
> + irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> + } else {
> + pr_err("%s: BUS_ON req failed(%d). irq_status: 0x%08x\n",
> + mmc_hostname(mmc), ret, irq_status);
> + irq_ack |= CORE_PWRCTL_BUS_FAIL;
> + }
> }
> if (irq_status & CORE_PWRCTL_BUS_OFF) {
> - pwr_state = REQ_BUS_OFF;
> - io_level = REQ_IO_LOW;
> - irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> + if (mmc->supply.vmmc && msm_host->pltfm_init_done) {
> + ret = regulator_set_load(mmc->supply.vmmc, 0);
> + ret |= mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
> + mmc->ios.vdd);
> + if (ret)
> + pr_err("%s: vqmmc disabling failed: %d\n",
> + mmc_hostname(mmc), ret);
> + }
> + if (mmc->supply.vqmmc && msm_host->pltfm_init_done && !ret) {
> + ret = regulator_set_load(mmc->supply.vqmmc, 0);
> + ret |= regulator_disable(mmc->supply.vqmmc);
> + if (ret)
> + pr_err("%s: vqmmc disabling failed: %d\n",
> + mmc_hostname(mmc), ret);
> + }
> + if (!ret) {
> + pwr_state = REQ_BUS_OFF;
> + io_level = REQ_IO_LOW;
> + irq_ack |= CORE_PWRCTL_BUS_SUCCESS;
> + } else {
> + pr_err("%s: BUS_ON req failed(%d). irq_status: 0x%08x\n",
> + mmc_hostname(mmc), ret, irq_status);
> + irq_ack |= CORE_PWRCTL_BUS_FAIL;
> + }
> }
> /* Handle IO LOW/HIGH */
> if (irq_status & CORE_PWRCTL_IO_LOW) {
> @@ -1370,6 +1419,15 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> irq_ack |= CORE_PWRCTL_IO_SUCCESS;
> }
>
> + if (io_level && mmc->supply.vqmmc && !pwr_state) {
> + ret = mmc_regulator_set_vqmmc(mmc, &mmc->ios);
> + if (ret)
> + pr_err("%s: IO_level setting failed(%d). signal_voltage: %d, vdd: %d irq_status: 0x%08x\n",
> + mmc_hostname(mmc), ret,
> + mmc->ios.signal_voltage, mmc->ios.vdd,
> + irq_status);
> + }
> +
> /*
> * The driver has to acknowledge the interrupt, switch voltages and
> * report back if it succeded or not to this register. The voltage
> @@ -1415,10 +1473,9 @@ static void sdhci_msm_handle_pwr_irq(struct sdhci_host *host, int irq)
> msm_host->curr_pwr_state = pwr_state;
> if (io_level)
> msm_host->curr_io_level = io_level;
> -
> pr_debug("%s: %s: Handled IRQ(%d), irq_status=0x%x, ack=0x%x\n",
> - mmc_hostname(msm_host->mmc), __func__, irq, irq_status,
> - irq_ack);
> + mmc_hostname(msm_host->mmc), __func__,
> + irq, irq_status, irq_ack);
> }
>
> static irqreturn_t sdhci_msm_pwr_irq(int irq, void *data)
> @@ -1605,6 +1662,19 @@ static void sdhci_msm_set_regulator_caps(struct sdhci_msm_host *msm_host)
> pr_debug("%s: supported caps: 0x%08x\n", mmc_hostname(mmc), caps);
> }
>
> +static int sdhci_msm_register_vreg(struct sdhci_msm_host *msm_host)
> +{
> + int ret = 0;
> +
> + ret = mmc_regulator_get_supply(msm_host->mmc);
> + if (ret)
> + return ret;
> + sdhci_msm_set_regulator_caps(msm_host);
> +
> + return 0;
> +
> +}
> +
> static const struct sdhci_msm_variant_ops mci_var_ops = {
> .msm_readl_relaxed = sdhci_msm_mci_variant_readl_relaxed,
> .msm_writel_relaxed = sdhci_msm_mci_variant_writel_relaxed,
> @@ -1650,7 +1720,8 @@ static void sdhci_msm_set_regulator_caps(struct sdhci_msm_host *msm_host)
> .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
> SDHCI_QUIRK_SINGLE_POWER_WRITE |
> SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> - .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
> + .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
> + SDHCI_QUIRK2_INTERNAL_PWR_CTL,
> .ops = &sdhci_msm_ops,
> };
>
> @@ -1819,6 +1890,10 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> msm_offset->core_vendor_spec_capabilities0);
> }
>
> + ret = sdhci_msm_register_vreg(msm_host);
> + if (ret == -EPROBE_DEFER)
> + goto clk_disable;
> +
> /*
> * Power on reset state may trigger power irq if previous status of
> * PWRCTL was either BUS_ON or IO_HIGH_V. So before enabling pwr irq
> @@ -1867,7 +1942,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> ret = sdhci_add_host(host);
> if (ret)
> goto pm_runtime_disable;
> - sdhci_msm_set_regulator_caps(msm_host);
> + msm_host->pltfm_init_done = true;
>
> pm_runtime_mark_last_busy(&pdev->dev);
> pm_runtime_put_autosuspend(&pdev->dev);
>

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