linux-kernel - Re: [PATCH] HID: i2c-hid: Disable runtime PM on Goodix touchpad

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Message-ID: <nycvar.YFH.7.76.1901141217550.6626@cbobk.fhfr.pm>
Date:   Mon, 14 Jan 2019 12:18:37 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
cc:     benjamin.tissoires@...hat.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: i2c-hid: Disable runtime PM on Goodix touchpad

On Mon, 14 Jan 2019, Kai-Heng Feng wrote:

> A Goodix touchpad doesn't work. Touching the touchpad can trigger IRQ
> but there's no input event from HID subsystem.
> 
> Turns out it reports some invalid data:
> [   22.136630] i2c_hid i2c-DELL091F:00: input: 0b 00 01 00 00 00 00 00 00 00 00
> 
> After some trial and error, it's another device that doesn't work well
> with ON/SLEEP commands. Disable runtime PM to fix the issue.

Thanks, I've now applied the patch to for-5.0/upstream-fixes. I am 
wondering though we are we seeing these at all - do other OSes not do the 
runtime PM on i2c at all?

-- 
Jiri Kosina
SUSE Labs