linux-kernel - Re: [PATCH v2] HID: i2c-hid: Add a small delay after sleep command for Raydium touchpanel

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Message-ID: <nycvar.YFH.7.76.1810261709310.23511@cbobk.fhfr.pm>
Date:   Fri, 26 Oct 2018 17:09:40 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
cc:     benjamin.tissoires@...hat.com, hdegoede@...hat.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] HID: i2c-hid: Add a small delay after sleep command
 for Raydium touchpanel

On Fri, 5 Oct 2018, Kai-Heng Feng wrote:

> Raydium touchpanel (2386:4B33) sometimes does not work in desktop session
> although it works in display manager.
> 
> During user logging, the display manager exits, close the HID device,
> then the device gets runtime suspended and powered off. The desktop
> session begins shortly after, opens the HID device, then the device gets
> runtime resumed and powered on.
> 
> If the trasition from display manager to desktop sesesion is fast, the
> touchpanel cannot switch from powered off to powered on in short
> timeframe. So add a small delay to workaround the issue.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
> v2:
> - Use quirk to only match affected touchpanel
> - Only delay the next power on if the time hasn't elapsed

Applied, thanks.

-- 
Jiri Kosina
SUSE Labs