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authorFu, Zhonghui <zhonghui.fu@linux.intel.com>2015-12-04 21:05:56 +0800
committerUlf Hansson <ulf.hansson@linaro.org>2015-12-22 11:32:16 +0100
commitec076cd226c3d93565ede082a240e23b5090e36c (patch)
tree026021002f507e52d19245d7a53c59fcdf75e800 /drivers/mmc
parent5c671c410c8704800f4f1673b6f572137e7e6ddd (diff)
downloadlinux-ec076cd226c3d93565ede082a240e23b5090e36c.tar.bz2
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/bus.c2
-rw-r--r--drivers/mmc/core/sdio_bus.c1
2 files changed, 3 insertions, 0 deletions
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);