Attention is currently required from: Furquan Shaikh, Martin Roth, Henry Sun, Evan Green, Justin TerAvest, Chen Wisley.
Karthik Ramasubramanian has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49469 )
Change subject: mb/google/dedede/var/drawcia: Add support to handle pen detection
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Patch Set 9:
(1 comment)
File src/mainboard/google/dedede/variants/drawcia/gpio.c:
https://review.coreboot.org/c/coreboot/+/49469/comment/3b09f7a3_7168ab95
PS9, Line 17: if (fw_config_probe(FW_CONFIG(TABLETMODE, TABLETMODE_ENABLED)))
We had some discussion in the past for the same and decided not to allocate a FW_CONFIG bit - b/16 […]
Is there a bug capturing the details of this stylus behavior?
b/177618684
I am confused why internal pull-down prevents the voltage level from hitting logic low. Is the internal pull-down weaker than the pull-up being configured on the pad? Or is it not strong enough to be read as logic low?
SoC side internal pull-up max out at 20K. The stylus has internal pull down of 10K. Accounting for some variability, the input is reading as 1.5 V when the pen is inserted. Again more details can be found in the bug.
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