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Message-ID: <56A1B3B1.7010903@linux.intel.com>
Date: Fri, 22 Jan 2016 12:44:33 +0800
From: "Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To: Wolfram Sang <wsa@...-dreams.de>
Cc: srinivas.kowtal@...el.com, linux-i2c@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] i2c: enable i2c device to suspend/resume
asynchronously
Hi Wolfram,
What do you think about this patch?
Thanks,
Zhonghui
On 12/24/2015 10:41 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 i2c devices to suspend/resume asynchronously. This will take
> advantage of multicore and improve system suspend/resume speed. After
> enabling all i2c devices, i2c adapters and i2c controllers on ASUS
> T100TA tablet, the system suspend-to-idle time is reduced to about
> 510ms from 750ms, and the system resume time is reduced to about 790ms
> from 900ms.
>
> Signed-off-by: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
> ---
> drivers/i2c/i2c-core.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index ba8eb08..4ff620e 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -1072,6 +1072,7 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
> client->dev.of_node = info->of_node;
> client->dev.fwnode = info->fwnode;
>
> + device_enable_async_suspend(&client->dev);
> i2c_dev_set_name(adap, client);
> status = device_register(&client->dev);
> if (status)
> -- 1.7.1
>
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