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

[Jarkko Nikula]

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