linux-kernel - Re: [PATCH v3] mmc: enable mmc host device to suspend/resume asynchronously

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Date:	Mon, 23 Nov 2015 12:02:49 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linus.walleij@...aro.org, Markus.Niebel@...group.com,
	lars@...afoo.de, s.hauer@...gutronix.de,
	kristina.martsenko@...il.com
CC:	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] mmc: enable mmc host device to suspend/resume asynchronously


Any comments are welcome.


Thanks,
Zhonghui

On 11/16/2015 12:20 AM, Fu, Zhonghui wrote:
> 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 timing dependency between devices. This
> patch enables mmc host device to suspend/resume asynchronously. This
> will take advantage of multicore and improve system suspend/resume
> speed. After enabling the mmc host and all their child devices to
> suspend/resume asynchronously on ASUS T100TA, the system suspend-to-
> idle time is reduced from 1645ms to 1114ms, and the system resume
> time is reduced from 940ms to 914ms.
>
> Signed-off-by: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
> ---
> Changes in v3:
> - Add test result in 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 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
>

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