From ec076cd226c3d93565ede082a240e23b5090e36c Mon Sep 17 00:00:00 2001 From: "Fu, Zhonghui" Date: Fri, 4 Dec 2015 21:05:56 +0800 Subject: [PATCH] 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 Signed-off-by: Ulf Hansson --- drivers/mmc/core/bus.c | 2 ++ drivers/mmc/core/sdio_bus.c | 1 + 2 files changed, 3 insertions(+) diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c index 972ff844cf5a..4bc48f10452f 100644 --- a/drivers/mmc/core/bus.c +++ b/drivers/mmc/core/bus.c @@ -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; diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c index 7e327a6dd53d..86f5b3223aae 100644 --- a/drivers/mmc/core/sdio_bus.c +++ b/drivers/mmc/core/sdio_bus.c @@ -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); -- 2.34.1