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SubjectRe: [PATCH v2 3/5] mmc: mediatek: Add PM support for MMC driver
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@mediatek.com>
> ---
> drivers/mmc/host/mtk-sd.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 93 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 86c999b..e02f6a6 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -1186,6 +1232,8 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> int ret;
> u32 ddr = 0;
>
> + pm_runtime_get_sync(host->dev);
> +
> if (ios->timing == MMC_TIMING_UHS_DDR50)
> ddr = 1;
>
> @@ -1230,6 +1278,9 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>
> if (host->mclk != ios->clock || host->ddr != ddr)
> msdc_set_mclk(host, ddr, ios->clock);
> +
> + pm_runtime_mark_last_busy(host->dev);
> + pm_runtime_put_autosuspend(host->dev);

This may also be imbalanced. This function can return between
pm_runtime_get_sync() and pm_runtime_put_autosuspend().

Sascha

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