mmc: core: Introduce MMC_CAP_SYNC_RUNTIME_PM (7d5ef512) · Commits · 戴 / test

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>

drivers/mmc/core/core.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -887,6 +887,9 @@ 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));
		if (host->caps & MMC_CAP_SYNC_RUNTIME_PM)
		pm_runtime_put_sync_suspend(mmc_dev(host));
		else
		pm_runtime_put_autosuspend(mmc_dev(host));
		}
		}

include/linux/mmc/host.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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 */

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