[coreboot-gerrit] Change in coreboot[master]: mb/google/brya: Reset XHCI controller while preparing for S5

[Subrata Banik (Code Review)]

Attention is currently required from: Maulik V Vaghela, Tim Wawrzynczak, Sridhar Siricilla, Nick Vaccaro, Eric Lai.
Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63552 )

Change subject: mb/google/brya: Reset XHCI controller while preparing for S5
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Patch Set 3:

(1 comment)

File src/mainboard/google/brya/smihandler.c:

https://review.coreboot.org/c/coreboot/+/63552/comment/755b56f6_7c4d4cd6 
PS3, Line 16: ACPI_S5
> did this also end up applying to S3?

S3 is non-por for Chrome/Brya I believe, so we might don't need to bother adding xhci reset in S3 flow and there can be downside of XHCI controller getting reset during S3 entry as below:

- suppose user is coping a file from USB to HDD or vice verse
- expectation is upon S3 resume, the file transfer will continue from where it paused.

but with XHCI controller is getting reset, the user previous state won't be preserved.