Commit ec076cd2 authored Dec 04, 2015 by Fu, Zhonghui Committed by Ulf Hansson Dec 22, 2015

mmc: enable MMC/SD/SDIO device to suspend/resume asynchronously



Now, PM core supports asynchronous suspend/resume mode for devices
during system suspend/resume, and the power state transition of one
device may be completed in separate kernel thread. PM core ensures
all power state transition dependency between devices. This patch
enables MMC/SD/SDIO card and SDIO function devices to suspend/resume
asynchronously. This will take advantage of multicore and improve
system suspend/resume speed. After applying this patch and enabling
all SDIO function's child devices to suspend/resume asynchronously
on ASUS T100TA, the system suspend-to-idle time is reduced from
1645ms to 1108ms, and the system resume time is reduced from 940ms
to 918ms.

Signed-off-by: Zhonghui Fu <zhonghui.fu@linux.intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

parent 5c671c41

drivers/mmc/core/bus.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -349,6 +349,8 @@ int mmc_add_card(struct mmc_card *card)

		card->dev.of_node = mmc_of_find_child_device(card->host, 0);

		device_enable_async_suspend(&card->dev);

		ret = device_add(&card->dev);
		if (ret)
		return ret;

drivers/mmc/core/sdio_bus.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -322,6 +322,7 @@ int sdio_add_func(struct sdio_func *func)

		sdio_set_of_node(func);
		sdio_acpi_set_handle(func);
		device_enable_async_suspend(&func->dev);
		ret = device_add(&func->dev);
		if (ret == 0)
		sdio_func_set_present(func);

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