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mmc: core: Introduce MMC_CAP_SYNC_RUNTIME_PM

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To allow mmc host drivers to inform the mmc core about rather using
pm_runtime_put_sync_suspend() instead of pm_runtime_put_autosuspend(),
let's introduce MMC_CAP_SYNC_RUNTIME_PM.

This is especially useful for those mmc host drivers that don't benefit
from using the runtime PM autosuspend feature. Typically this is those that
relies on parent devices to power the card via runtime PM, like some USB
host drivers for example.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
This commit is contained in:
Ulf Hansson 2018-05-31 11:40:38 +02:00
parent a89e7bcb18
commit 7d5ef51257
2 changed files with 5 additions and 2 deletions
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5
drivers/mmc/core/core.c
View File

@ -887,7 +887,10 @@ void mmc_release_host(struct mmc_host *host)
spin_unlock_irqrestore(&host->lock, flags);
wake_up(&host->wq);
pm_runtime_mark_last_busy(mmc_dev(host));
pm_runtime_put_autosuspend(mmc_dev(host));
if (host->caps & MMC_CAP_SYNC_RUNTIME_PM)
pm_runtime_put_sync_suspend(mmc_dev(host));
else
pm_runtime_put_autosuspend(mmc_dev(host));
}
}
EXPORT_SYMBOL(mmc_release_host);

2
include/linux/mmc/host.h
View File

@ -334,7 +334,7 @@ struct mmc_host {
#define MMC_CAP_UHS (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | \
MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | \
MMC_CAP_UHS_DDR50)
/* (1 << 21) is free for reuse */
#define MMC_CAP_SYNC_RUNTIME_PM (1 << 21) /* Synced runtime PM suspends. */
#define MMC_CAP_DRIVER_TYPE_A (1 << 23) /* Host supports Driver Type A */
#define MMC_CAP_DRIVER_TYPE_C (1 << 24) /* Host supports Driver Type C */
#define MMC_CAP_DRIVER_TYPE_D (1 << 25) /* Host supports Driver Type D */