linux-kernel - Re: [PATCHv3] HID: i2c-hid: Add sleep between POWER ON and RESET

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Message-ID: <alpine.LSU.2.20.1701112155370.25515@cbobk.fhfr.pm>
Date:   Wed, 11 Jan 2017 21:55:51 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Brendan McGrath <redmcg@...mandi.dyndns.org>
cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Victor Vlasenko <victor.vlasenko@...gears.com>,
        Frederik Wenigwieser <frederik.wenigwieser@...il.com>
Subject: Re: [PATCHv3] HID: i2c-hid: Add sleep between POWER ON and RESET

On Sat, 7 Jan 2017, Brendan McGrath wrote:

> Support for the Asus Touchpad was recently added. It turns out this
> device can fail initialisation (and become unusable) when the RESET
> command is sent too soon after the POWER ON command.
> 
> Unfortunately the i2c-hid specification does not specify the need for
> a delay between these two commands. But it was discovered the Windows
> driver has a 1ms delay.
> 
> As a result, this patch modifies the i2c-hid module to add a sleep
> inbetween the POWER ON and RESET commands which lasts between 1ms and 5ms.
> 
> See https://github.com/vlasenko/hid-asus-dkms/issues/24 for further
> details.
> 
> Signed-off-by: Brendan McGrath <redmcg@...mandi.dyndns.org>
> ---
> Changes since v2:
>   - added comments to explain the reason for the sleep

Applied to for-4.10/upstream-fixes, thanks.

-- 
Jiri Kosina
SUSE Labs