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* [PATCH 1/2] mmc: enable mmc host device to suspend/resume asynchronously
@ 2015-12-28 15:39 Fu, Zhonghui
  2015-12-29  9:38 ` Venu Byravarasu
                   ` (2 more replies)
  0 siblings, 3 replies; 5+ messages in thread
From: Fu, Zhonghui @ 2015-12-28 15:39 UTC (permalink / raw)
  To: Ulf Hansson
  Cc: Adrian Hunter, chaotian.jing, lars, vbyravarasu, sergei.shtylyov,
	linux-mmc, linux-kernel@vger.kernel.org

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 hosts to suspend/resume asynchronously. This will take
advantage of multicore and 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@linux.intel.com>
---
 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 da950c4..7222fd7 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_initialize(&host->class_dev);
+	device_enable_async_suspend(&host->class_dev);
 
 	if (mmc_gpio_alloc(host)) {
 		put_device(&host->class_dev);
-- 1.7.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2016-01-22  3:37 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-12-28 15:39 [PATCH 1/2] mmc: enable mmc host device to suspend/resume asynchronously Fu, Zhonghui
2015-12-29  9:38 ` Venu Byravarasu
2016-01-11  5:28 ` Fu, Zhonghui
2016-01-12 14:42 ` Ulf Hansson
2016-01-22  3:37   ` Fu, Zhonghui

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