linux-kernel - Re: [PATCH] i2c_hid: enable i2c-hid devices to suspend/resume asynchronously

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Date:	Tue, 24 May 2016 12:24:47 +0200 (CEST)
From:	Jiri Kosina <jikos@...nel.org>
To:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
cc:	benjamin.tissoires@...hat.com, dtor@...omium.org,
	bleung@...omium.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	aduggan@...aptics.com, k.kozlowski@...sung.com,
	dianders@...omium.org, gabriele.mzt@...il.com,
	linux-input@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c_hid: enable i2c-hid devices to suspend/resume
 asynchronously

On Thu, 19 May 2016, Fu, Zhonghui wrote:

> i2c-hid devices' suspend/resume are usually time-consuming process.
> For example, the touch controller(i2c-ATML1000:00) on ASUS T100 tablet
> takes about 160ms for suspending and 120ms for resuming. This patch
> enables i2c-hid devices to suspend/resume asynchronously. This will
> take advantage of multicore and speed up system suspend/resume process.

Umm, why do we need this in the first place, given the fact that we are 
enabling async suspend for each and every HID device allocated via 
hid_allocate_device() already?

-- 
Jiri Kosina
SUSE Labs