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

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Message-ID: <56933D98.9090409@linux.intel.com>
Date:	Mon, 11 Jan 2016 13:28:56 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	chaotian.jing@...iatek.com, lars@...afoo.de,
	vbyravarasu@...dia.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


Hi Ulf,

What do you think about this patch?


Thanks,
Zhonghui

On 12/28/2015 11:39 PM, 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 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
>