Messages in this thread | | | Subject | Re: [BUG] i2c-hid: ELAN Touchpad does not work on ASUS X580GD | From | Jarkko Nikula <> | Date | Tue, 8 May 2018 17:31:16 +0300 |
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Hi
On 05/07/2018 11:07 AM, Chris Chiu wrote:
>> Besides, according to ASUS's input, they observed that after entering >> the OS, the frequency of SCL is too fast (about 600kHz) and the SCL High >> time is around 450ns, not following I2C spec which is 0.6us. >> https://pasteboard.co/HjzSWXd.png >> > Some update, we can make the touchpad work by simply modifying the > clk_rate of spt_i2c_info from 120000000 to 133000000 in intel-lpss-pci.c for > specific PCI ID 8086:a368 ~ a36a (CoffeeLake). Is the clock setting different > for the CoffeeLake series? > Hmm.. at quick look it looks like to be 133 MHz but I want to double check first from other specs. I'm also wondering why it results 600 kHz instead of expected 133/120 * 400 kHz = 443 kHz. Need to check timing parameters too.
-- Jarkko
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