linux-kernel - RE: [PATCH 1/2] mmc: enable mmc host device to suspend/resume asynchronously

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Date:	Tue, 29 Dec 2015 09:38:47 +0000
From:	Venu Byravarasu <vbyravarasu@...dia.com>
To:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Adrian Hunter <adrian.hunter@...el.com>,
	"chaotian.jing@...iatek.com" <chaotian.jing@...iatek.com>,
	"lars@...afoo.de" <lars@...afoo.de>,
	"sergei.shtylyov@...entembedded.com" 
	<sergei.shtylyov@...entembedded.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] mmc: enable mmc host device to suspend/resume
 asynchronously

Looks good to me.

Acked-by: Venu Byravarasu <vbyravarasu@...dia.com>

BR,
Venu


-----Original Message-----
From: Fu, Zhonghui [mailto:zhonghui.fu@...ux.intel.com] 
Sent: Monday, December 28, 2015 9:09 PM
To: Ulf Hansson
Cc: Adrian Hunter; chaotian.jing@...iatek.com; lars@...afoo.de; Venu Byravarasu; sergei.shtylyov@...entembedded.com; linux-mmc; linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] mmc: enable mmc host 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 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@...ux.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