linux-kernel - Re: [PATCH v3] HID: i2c-hid: Skip ELAN power-on command after reset

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Date:   Wed, 14 Apr 2021 08:28:49 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Johnny Chuang <johnny.chuang.emc@...il.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Peter Hutterer <peter.hutterer@...-t.net>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        Harry Cutts <hcutts@...omium.org>,
        Johnny Chuang <johnny.chuang@....com.tw>,
        James Chen <james.chen@....com.tw>,
        Jennifer Tsai <jennifer.tsai@....com.tw>,
        Paul Liang <paul.liang@....com.tw>,
        Jeff Chuang <jeff.chuang@....com.tw>,
        Jingle <jingle.wu@....com.tw>
Subject: Re: [PATCH v3] HID: i2c-hid: Skip ELAN power-on command after reset

Hi,

On Mon, Apr 12, 2021 at 6:20 PM Johnny Chuang
<johnny.chuang.emc@...il.com> wrote:
>
> Fixes: 43b7029f475e ("HID: i2c-hid: Send power-on command after reset").

Note that the "Fixes" tag actually belongs down at the end. It also
shouldn't have a "." at the end. Presumably the maintainer can adjust
this when landing?


> For ELAN touchscreen, we found our boot code of IC was not flexible enough
> to receive and handle this command.
> Once the FW main code of our controller is crashed for some reason,
> the controller could not be enumerated successfully to be recognized
> by the system host. therefore, it lost touch functionality.
>
> Add quirk for skip send power-on command after reset.
> It will impact to ELAN touchscreen and touchpad on HID over I2C projects.
>
> Signed-off-by: Johnny Chuang <johnny.chuang.emc@...il.com>

This patch looks fine to me, thus:

Reviewed-by: Douglas Anderson <dianders@...omium.org>

I can confirm that after applying this patch I can recovery my borked
touchscreen (which got borked by a failed firmware update ages ago):

Tested-by: Douglas Anderson <dianders@...omium.org>