Re: [PATCH V2 1/3] mmc: dw_mmc: use mmc_regulator_get_supply to handle regulators

Jaehoon Chung
2014-08-25T12:32:02Z

On 08/22/2014 10:47 PM, Yuvaraj Kumar C D wrote:
> This patch makes use of mmc_regulator_get_supply() to handle
> the vmmc and vqmmc regulators.Also it moves the code handling
> the these regulators to dw_mci_set_ios().It turned on the vmmc
> and vqmmc during MMC_POWER_UP and MMC_POWER_ON,and turned off
> during MMC_POWER_OFF.
>
> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
> ---
> changes from v1:
> 1.Used mmc_regulator_set_ocr() instead of regulator_enable() for vmmc.
> 2.Turned on vmmc and vqmmc during MMC_POWER_UP.
> 3. Removed the flags DW_MMC_CARD_POWERED and DW_MMC_IO_POWERED which
> added during the initial version of this patch.
> 4. Added error message, if it failed to turn on regulator's.
>
> drivers/mmc/host/dw_mmc.c | 72 +++++++++++++++++++++-----------------------
> include/linux/mmc/dw_mmc.h | 2 +-
> 2 files changed, 36 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 7f227e9..aadb0d6 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -936,6 +936,7 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> struct dw_mci_slot *slot = mmc_priv(mmc);
> const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
> u32 regs;
> + int ret;
>
> switch (ios->bus_width) {
> case MMC_BUS_WIDTH_4:
> @@ -974,12 +975,38 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>
> switch (ios->power_mode) {
> case MMC_POWER_UP:
> + if (!IS_ERR(mmc->supply.vmmc)) {
> + ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc,
> + ios->vdd);
> + if (ret) {
> + dev_err(slot->host->dev,
> + "failed to enable vmmc regulator\n");
> + /*return, if failed turn on vmmc*/
> + return;
> + }
> + }
> + if (!IS_ERR(mmc->supply.vqmmc) && !slot->host->vqmmc_enabled) {

Can't use the regulator_is_enabled() instead of "slot->host->vqmmc_enabled"?

Best Regards,
Jaehoon Chung
> + ret = regulator_enable(mmc->supply.vqmmc);
> + if (ret < 0)
> + dev_err(slot->host->dev,
> + "failed to enable vqmmc regulator\n");
> + else
> + slot->host->vqmmc_enabled = true;
> + }
> set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
> regs = mci_readl(slot->host, PWREN);
> regs |= (1 << slot->id);
> mci_writel(slot->host, PWREN, regs);
> break;
> case MMC_POWER_OFF:
> + if (!IS_ERR(mmc->supply.vmmc))
> + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> +
> + if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) {
> + regulator_disable(mmc->supply.vqmmc);
> + slot->host->vqmmc_enabled = false;
> + }
> +
> regs = mci_readl(slot->host, PWREN);
> regs &= ~(1 << slot->id);
> mci_writel(slot->host, PWREN, regs);
> @@ -2110,7 +2137,13 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
> mmc->f_max = freq[1];
> }
>
> - mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
> + /*if there are external regulators, get them*/
> + ret = mmc_regulator_get_supply(mmc);
> + if (ret == -EPROBE_DEFER)
> + goto err_setup_bus;
> +
> + if (!mmc->ocr_avail)
> + mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
>
> if (host->pdata->caps)
> mmc->caps = host->pdata->caps;
> @@ -2176,7 +2209,7 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
>
> err_setup_bus:
> mmc_free_host(mmc);
> - return -EINVAL;
> + return ret;
> }
>
> static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)
> @@ -2469,24 +2502,6 @@ int dw_mci_probe(struct dw_mci *host)
> }
> }
>
> - host->vmmc = devm_regulator_get_optional(host->dev, "vmmc");
> - if (IS_ERR(host->vmmc)) {
> - ret = PTR_ERR(host->vmmc);
> - if (ret == -EPROBE_DEFER)
> - goto err_clk_ciu;
> -
> - dev_info(host->dev, "no vmmc regulator found: %d\n", ret);
> - host->vmmc = NULL;
> - } else {
> - ret = regulator_enable(host->vmmc);
> - if (ret) {
> - if (ret != -EPROBE_DEFER)
> - dev_err(host->dev,
> - "regulator_enable fail: %d\n", ret);
> - goto err_clk_ciu;
> - }
> - }
> -
> host->quirks = host->pdata->quirks;
>
> spin_lock_init(&host->lock);
> @@ -2630,8 +2645,6 @@ err_workqueue:
> err_dmaunmap:
> if (host->use_dma && host->dma_ops->exit)
> host->dma_ops->exit(host);
> - if (host->vmmc)
> - regulator_disable(host->vmmc);
>
> err_clk_ciu:
> if (!IS_ERR(host->ciu_clk))
> @@ -2667,9 +2680,6 @@ void dw_mci_remove(struct dw_mci *host)
> if (host->use_dma && host->dma_ops->exit)
> host->dma_ops->exit(host);
>
> - if (host->vmmc)
> - regulator_disable(host->vmmc);
> -
> if (!IS_ERR(host->ciu_clk))
> clk_disable_unprepare(host->ciu_clk);
>
> @@ -2686,9 +2696,6 @@ EXPORT_SYMBOL(dw_mci_remove);
> */
> int dw_mci_suspend(struct dw_mci *host)
> {
> - if (host->vmmc)
> - regulator_disable(host->vmmc);
> -
> return 0;
> }
> EXPORT_SYMBOL(dw_mci_suspend);
> @@ -2697,15 +2704,6 @@ int dw_mci_resume(struct dw_mci *host)
> {
> int i, ret;
>
> - if (host->vmmc) {
> - ret = regulator_enable(host->vmmc);
> - if (ret) {
> - dev_err(host->dev,
> - "failed to enable regulator: %d\n", ret);
> - return ret;
> - }
> - }
> -
> if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
> ret = -ENODEV;
> return ret;
> diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
> index 29ce014..84e2827 100644
> --- a/include/linux/mmc/dw_mmc.h
> +++ b/include/linux/mmc/dw_mmc.h
> @@ -188,7 +188,7 @@ struct dw_mci {
> /* Workaround flags */
> u32 quirks;
>
> - struct regulator *vmmc; /* Power regulator */
> + bool vqmmc_enabled;
> unsigned long irq_flags; /* IRQ flags */
> int irq;
> };
>