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Subject[PATCH 2/2] mmc/sdhci-acpi: enable sdhci-acpi 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 sdhci-acpi devices to suspend/resume asynchronously. This
will take advantage of multicore and improve system suspend/resume
speed. After enabling the sdhci-acpi devices and all their child
devices to suspend/resume asynchronously on ASUS T100TA, the system
suspend-to-idle time is reduced from 1645ms to 1089ms, and the
system resume time is reduced from 940ms to 908ms.

Signed-off-by: Zhonghui Fu <>
drivers/mmc/host/sdhci-acpi.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index f6047fc..3d27f2d 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -388,6 +388,8 @@ static int sdhci_acpi_probe(struct platform_device *pdev)

+ device_enable_async_suspend(dev);
return 0;

-- 1.7.1

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