Bug 210497

Summary: Touchpad stops working after "pinctrl: intel: Disable input and output buffer when switching to GPIO"
Product: Drivers Reporter: Kai-Heng Feng (kai.heng.feng)
Component: OtherAssignee: Andy Shevchenko (andy.shevchenko)
Status: RESOLVED PATCH_ALREADY_AVAILABLE    
Severity: normal CC: andy.shevchenko, jarkko.nikula, mika.westerberg, pierre-louis.bossart
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: mainline Subsystem:
Regression: No Bisected commit-id:
Attachments: dmesg
dmesg with commit reverted

Description Kai-Heng Feng 2020-12-05 14:26:03 UTC 
The platform is Tiger Lake.

After the mentioned commit:
[    2.249086] i2c_designware i2c_designware.1: controller timed out

Reverting the commit can make the touchpad works over I2C bus.
Comment 1 Kai-Heng Feng 2020-12-05 14:26:26 UTC 
Created attachment 293947 [details]
dmesg
Comment 2 Kai-Heng Feng 2020-12-05 14:26:47 UTC 
Created attachment 293949 [details]
dmesg with commit reverted
Comment 3 Andy Shevchenko 2020-12-06 22:01:42 UTC 
This is interesting. I have TGL laptop here and I think touchpad wasn’t working even before that commit. Anyway I will test it next week, thanks for reporting.
Comment 4 Andy Shevchenko 2020-12-07 18:03:44 UTC 
Fix has been sent: https://lore.kernel.org/linux-gpio/20201207175940.10631-1-andriy.shevchenko@linux.intel.com/

Thank you for the bisecting, it was really helpful!