Julius Werner has posted comments on this change. ( https://review.coreboot.org/19863 )
Change subject: google/gru: enable the pull high for touchpad ......................................................................
Patch Set 2:
(1 comment)
Okay... if what Jeffy said is right and the delay (with new firmware) is one second, I would be okay with merging something like this. But please explain more clearly in the commit message that we have to drive the stronger pull-up within 1 second of powering up the touchpad to prevent its firmware from falling into recovery.
https://review.coreboot.org/#/c/19863/2/src/mainboard/google/gru/romstage.c File src/mainboard/google/gru/romstage.c:
Line 81: prepare_i2c(); If the required delay is a full second, it should be okay to put this in ramstage.