Re: [PATCH v2 3/5] mmc: mediatek: Add PM support for MMC driver

[Sascha Hauer]

On Tue, Mar 17, 2015 at 11:13:53AM +0800, Chaotian Jing wrote:
> Add PM support for Mediatek MMC driver
> 
> Signed-off-by: Chaotian Jing <chaotian.jing@xxxxxxxxxxxx>
> ---
>  drivers/mmc/host/mtk-sd.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 93 insertions(+), 1 deletion(-)
> 
> @@ -1003,6 +1042,8 @@ static int msdc_ops_switch_volt(struct mmc_host *mmc, struct mmc_ios *ios)
>  
>  	if (!IS_ERR(mmc->supply.vqmmc)) {
>  
> +		pm_runtime_get_sync(host->dev);
> +
>  		if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
>  			min_uv = 3300000;
>  			max_uv = 3300000;
> @@ -1011,6 +1052,9 @@ static int msdc_ops_switch_volt(struct mmc_host *mmc, struct mmc_ios *ios)
>  			max_uv = 1800000;
>  		} else {
>  			dev_err(host->dev, "Unsupported signal voltage!\n");
> +
> +			pm_runtime_mark_last_busy(host->dev);
> +			pm_runtime_put_autosuspend(host->dev);
>  			return -EINVAL;
>  		}
>  
> @@ -1022,6 +1066,8 @@ static int msdc_ops_switch_volt(struct mmc_host *mmc, struct mmc_ios *ios)
>  		}
>  	}
>  
> +	pm_runtime_mark_last_busy(host->dev);
> +	pm_runtime_put_autosuspend(host->dev);

This is unbalanced. You do a pm_runtime_get_sync() depending on
!IS_ERR(mmc->supply.vqmmc), but you call pm_runtime_put_autosuspend()
unconditionally. Besides, I don't see that the pm_ops are necessary here
at all. This function does nothing on the controller.

Sascha


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