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

From: Jarkko Nikula
Date: Tue May 15 2018 - 06:20:49 EST

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.