[PATCH 1/2 v2] mmc: enable mmc host device to suspend/resume asynchronously

From: Fu, Zhonghui
Date: Thu Jan 21 2016 - 22:33:20 EST

This patch enables mmc hosts to suspend/resume asynchronously.
This will improve system suspend/resume speed. After applying
this patch and enabling all mmc hosts' child devices to
suspend/resume asynchronously on ASUS T100TA, the system
suspend-to-idle time is reduced from 1645ms to 1107ms, and the
system resume time is reduced from 940ms to 914ms.

Signed-off-by: Zhonghui Fu <zhonghui.fu@xxxxxxxxxxxxxxx>
Acked-by: Venu Byravarasu <vbyravarasu@xxxxxxxxxx>
Changes in v2:
- Update commit message

drivers/mmc/core/host.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 0aecd5c..1d94607 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -339,6 +339,7 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
host->class_dev.parent = dev;
host->class_dev.class = &mmc_host_class;
+ device_enable_async_suspend(&host->class_dev);

if (mmc_gpio_alloc(host)) {
-- 1.7.1