Re: [PATCH v2 4/8] mmc: dw_mmc: Use mmc_regulator_set_vqmmc in start_signal_voltage_switch

[Jaehoon Chung <jh80.chung@samsung.com>]

Hi, Heiko.

Acked-by: Jaehoon Chung <jh80.chung@samsung.com>

Best Regards,
Jaehoon Chung


On 09/30/2015 11:07 PM, Heiko Stuebner wrote:
> From: Douglas Anderson <dianders@chromium.org>
> 
> We've introduced a new helper in the MMC core:
> mmc_regulator_set_vqmmc().  Let's use this in dw_mmc.  Using this new
> helper has some advantages:
> 
> 1. We get the mmc_regulator_set_vqmmc() behavior of trying to match
>    VQMMC and VMMC when the signal voltage is 3.3V.  This ensures max
>    compatibility.
> 
> 2. We get rid of a few more warnings when probing unsupported
>    voltages.
> 
> 3. We get rid of some non-dw_mmc specific code in dw_mmc.
> 
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
> ---
>  drivers/mmc/host/dw_mmc.c | 17 ++++++-----------
>  1 file changed, 6 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index fcbf552..b1b7e7f 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -1279,7 +1279,6 @@ static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
>  	const struct dw_mci_drv_data *drv_data = host->drv_data;
>  	u32 uhs;
>  	u32 v18 = SDMMC_UHS_18V << slot->id;
> -	int min_uv, max_uv;
>  	int ret;
>  
>  	if (drv_data && drv_data->switch_voltage)
> @@ -1291,22 +1290,18 @@ static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
>  	 * does no harm but you need to set the regulator directly.  Try both.
>  	 */
>  	uhs = mci_readl(host, UHS_REG);
> -	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
> -		min_uv = 2700000;
> -		max_uv = 3600000;
> +	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
>  		uhs &= ~v18;
> -	} else {
> -		min_uv = 1700000;
> -		max_uv = 1950000;
> +	else
>  		uhs |= v18;
> -	}
> +
>  	if (!IS_ERR(mmc->supply.vqmmc)) {
> -		ret = regulator_set_voltage(mmc->supply.vqmmc, min_uv, max_uv);
> +		ret = mmc_regulator_set_vqmmc(mmc, ios);
>  
>  		if (ret) {
>  			dev_dbg(&mmc->class_dev,
> -					 "Regulator set error %d: %d - %d\n",
> -					 ret, min_uv, max_uv);
> +					 "Regulator set error %d - %s V\n",
> +					 ret, uhs & v18 ? "1.8" : "3.3");
>  			return ret;
>  		}
>  	}
>