From: Jarkko Nikula <jarkko.nikula@linux.intel.com>
To: Chris Chiu <chiu@endlessm.com>
Cc: Daniel Drake <drake@endlessm.com>,
Jian-Hong Pan <jian-hong@endlessm.com>,
Jiri Kosina <jikos@kernel.org>,
Benjamin Tissoires <benjamin.tissoires@redhat.com>,
Jani Nikula <jani.nikula@intel.com>,
Hans de Goede <hdegoede@redhat.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Adrian Salido <salidoa@google.com>,
Jason Gerecke <killertofu@gmail.com>,
linux-input <linux-input@vger.kernel.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Wolfram Sang <wsa@the-dreams.de>,
linux-i2c@vger.kernel.org,
Linux Kernel <linux-kernel@vger.kernel.org>,
Linux Upstreaming Team <linux@endlessm.com>
Subject: Re: [BUG] i2c-hid: ELAN Touchpad does not work on ASUS X580GD
Date: Thu, 17 May 2018 10:48:14 +0300 [thread overview]
Message-ID: <a3ce1af5-7b99-38db-fc51-4d580db1e87e@linux.intel.com> (raw)
In-Reply-To: <7728da79-8a7a-b87d-d09c-b36978b3032e@linux.intel.com>
Hi
On 05/15/2018 01:20 PM, Jarkko Nikula wrote:
> 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.
>
I got confirmation that input clock is actually even higher 216 Mhz.
While checking does it cover all of those CNL CNL-LP and CNL-H PCI IDs
may I add your Jian-Hong, Chris and Daniel email addresses to Repored-by
tags in a fix patch?
--
Jarkko
next prev parent reply other threads:[~2018-05-17 7:47 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-04 6:55 [BUG] i2c-hid: ELAN Touchpad does not work on ASUS X580GD Jian-Hong Pan
2018-05-07 8:07 ` Chris Chiu
2018-05-08 14:31 ` Jarkko Nikula
2018-05-08 15:47 ` Daniel Drake
2018-05-10 12:03 ` Chris Chiu
2018-05-14 14:20 ` Jarkko Nikula
2018-05-15 3:22 ` Chris Chiu
2018-05-15 10:20 ` Jarkko Nikula
2018-05-17 7:48 ` Jarkko Nikula [this message]
2018-05-17 9:05 ` Chris Chiu
2018-05-18 7:48 ` Hans de Goede
2018-05-18 8:37 ` Andy Shevchenko
2018-05-18 10:20 ` Andy Shevchenko
2018-05-18 10:58 ` Jarkko Nikula
2018-05-18 13:09 ` Hans de Goede
2018-05-18 13:15 ` Jarkko Nikula
2018-05-18 13:26 ` Hans de Goede
2018-05-19 11:58 ` Hans de Goede
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