linux-kernel - Re: [PATCH] Input: i8042 - Fix the selftest retry logic

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Date:   Fri, 6 Mar 2020 14:40:03 +0800
From:   AceLan Kao <acelan.kao@...onical.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Enrico Weigelt <info@...ux.net>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-input@...r.kernel.org,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Input: i8042 - Fix the selftest retry logic

Hi Dmitry,

We have a Dell desktop with ps2 addon card, after S3, the ps2 keyboard
lost function and got below errors
Jan 15 07:10:08 Rh-MT kernel: [  346.575353] i8042: i8042 controller
selftest timeout
Jan 15 07:10:08 Rh-MT kernel: [  346.575358] PM: Device i8042 failed
to resume: error -19

Adding this patch, I found the selftest passes at the second retry and
the keyboard continue working fine.

Best regards,
AceLan Kao.

Dmitry Torokhov <dmitry.torokhov@...il.com> 於 2020年3月6日 週五 下午12:16寫道：
>
> Hi AceLan,
>
> On Thu, Mar 05, 2020 at 02:44:23PM +0800, AceLan Kao wrote:
> > It returns -NODEV at the first selftest timeout, so the retry logic
> > doesn't work. Move the return outside of the while loop to make it real
> > retry 5 times before returns -ENODEV.
>
> The retry logic here was for the controller not returning the expected
> selftest value, not the controller refusing to communicate at all.
>
> Could you pease tell me what device requires this change?
>
> Thanks.
>
> --
> Dmitry