linux-kernel - Re: [PATCH v2] HID: i2c-hid: set power sleep before shutdown

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Date:	Tue, 21 Jun 2016 13:09:19 +0200 (CEST)
From:	Jiri Kosina <jikos@...nel.org>
To:	Guohua Zhong <ghzhong@...angdigital.com>
cc:	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Dmitry Torokhov <dtor@...omium.org>,
	Benson Leung <bleung@...omium.org>,
	Andrew Duggan <aduggan@...aptics.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] HID: i2c-hid: set power sleep before shutdown

On Tue, 21 Jun 2016, Guohua Zhong wrote:

> Add i2c_hid_shutdown for i2c-hid driver to send suspend cmd & free
> irq before device shutdown.
> 
> Some HW design (i.e. Umaro, a chromebook model) is that the power to
> i2c hid device won't down after device shutdown. Also the i2c-hid driver
> do not send suspend cmd to the hid i2c device and free its irq before
> shutdown.So if We touch the touchscreen or some other i2c hid device,
> the power consumtion will be go up even when the device is in shutdown
> state.
> 
> Though the root cause maybe a HW issue. But it seems that it is a
> good pratice to set power sleep for i2c-hid device before shutdown.

Applied, thanks.

-- 
Jiri Kosina
SUSE Labs