linux-kernel - RE: [PATCH 0/8] Input: support for latest Lenovo thinkpads (series 80)

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Date:   Tue, 10 Apr 2018 13:45:33 +0800
From:   廖崇榮 <kt.liao@....com.tw>
To:     "'Benjamin Tissoires'" <benjamin.tissoires@...hat.com>,
        "'Dmitry Torokhov'" <dmitry.torokhov@...il.com>
Cc:     "'Oliver Haessler'" <oliver@...hat.com>,
        "'Benjamin Berg'" <bberg@...hat.com>,
        "'open list:HID CORE LAYER'" <linux-input@...r.kernel.org>,
        "'lkml'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/8] Input: support for latest Lenovo thinkpads (series 80)

Hi Benjamin,

Thanks so much for your patch.

I have tested them for Elan Gen5/Gen6(new) touchpad with SMbus/PS2.
It works fine in my thinkpad so far but I find an issue today after lid-close/open.

I am not sure if you can see it in T480S , I "guess" it may be relative to i2c_i801.

The lid-close will enter deep sleep and cut touchpad power. 
I can see the resume flow after lid-open and SMbus-initial try to request hello package but fail.
Strangely, I can't see any SMbus host signal on LA scope after power-on.

I can't switch to SMbus after rmmod/modprobe psmouse because error happen in elantech_create_smbus.
It will be recovered only if I rmmod/modprobe i2c_i801 first.

Do you have any idea about it?

Thanks
KT
-----Original Message-----
From: Benjamin Tissoires [mailto:benjamin.tissoires@...hat.com] 
Sent: Friday, April 06, 2018 2:51 PM
To: Dmitry Torokhov
Cc: 廖崇榮; Oliver Haessler; Benjamin Berg; open list:HID CORE LAYER; lkml
Subject: Re: [PATCH 0/8] Input: support for latest Lenovo thinkpads (series 80)

Hi Dmitry,

On Fri, Apr 6, 2018 at 1:51 AM, Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> Hi Benjamin,
>
> On Thu, Apr 05, 2018 at 03:25:29PM +0200, Benjamin Tissoires wrote:
>> Hi Dmitry,
>>
>> well, this year, Lenovo gave us a surprise and decided to not use the 
>> same touchpad/trackstick in all its model. And by default, the 
>> support under Linux is less than ideal.
>>
>> Please find a series that should fix those issues. Compared to the 60 
>> series, there do not seem to e BIOS table issues this time, and 
>> suspend/resume works fine thanks to your latest trackstick fixes.
>>
>> The T480s is a different beast, as it uses an Elan touchpad.
>> I have been carrying the patches 3-6 for a while and tested previous 
>> versions on various Elan PS/2 hardware without an issue as far as I 
>> could tell. I was lacking tests from users with SMBus as all the 
>> laptops I tried where puer PS/2.
>>
>> Anyway, it would be cool if you could have a look at the series.
>
> I am mostly happy with the series, but I would love to hear KT's take 
> on it.

thanks for the quick review.
I worked closely with KT for this series. He helped me a lot for the tiny firmware changes that were required. However, quoting his email from Tuesday:
"There will be a spring vacation in Taiwan from tomorrow." I guess we won't hear from him until the end of next week as we always have a backlog of urgent things to do after holidays...

Cheers,
Benjamin