linux-kernel - Re: [BUG] i2c-hid: ELAN Touchpad does not work on ASUS X580GD

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Message-ID: <7728da79-8a7a-b87d-d09c-b36978b3032e@linux.intel.com>
Date:   Tue, 15 May 2018 13:20:58 +0300
From:   Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To:     Chris Chiu <chiu@...lessm.com>
Cc:     Daniel Drake <drake@...lessm.com>,
        Jian-Hong Pan <jian-hong@...lessm.com>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Adrian Salido <salidoa@...gle.com>,
        Jason Gerecke <killertofu@...il.com>,
        linux-input <linux-input@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: [BUG] i2c-hid: ELAN Touchpad does not work on ASUS X580GD

On 05/15/2018 06:22 AM, Chris Chiu wrote:
> What if I change the 120MHz to 180MHz and then make sure that the I2C operates
> in target FS mode frequency 400kHz via scope? Would there be any side effect?
> Maybe some other busses frequency could be also affected and causing some other
> component malfunction?
> 
Should be safe. It is only clock rate information when registering a 
fixed clock with known rate in intel-lpss.c and i2c-designware uses that 
info when calculating the timing parameters. I.e. it doesn't change any 
internal clocks.

I'm trying to find a contact who can confirm what is the expected rate 
of I2C input clock and is it common to all Cannon Lake HW.

-- 
Jarkko