atkbc: Better test for old chromebooks

Older Chromebooks have issues in their embedded controller (EC) firmware
which need working around in atkbd and atkbdc. On these systems, rather
than use a standard EC, Google used their own arm-based EC. For a while,
its firmware incorrectly implemented the i8042, requiring workaroundsd
in the driver.

Implement a heuristic recommended by MrChromebox <mrchromebox@gmail.com>
to detect them: If the bios.version starts with Google_, or the maker is
either Google or GOOGLE, assume that it's a chromebook with the affected
bios. While this isn't strictly true, the number of updated systems
without the bug is very small and this will exclude all the non-Google
coreboot user that use a standard EC. There's no simple way to test the
hardware to see if it's implemented with the buggy EC.

Sponsored by:		Netflix
Reviewed by:		jon@thesoo.org, MrChromebox
Differential Revision:	https://reviews.freebsd.org/D40789

1 files changed, 6 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index 002e30ce2835..3a6255bc6112 100644
--- a/UPDATING
+++ b/UPDATING
@@ -27,6 +27,12 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 14.x IS SLOW:
 	world, or to merely disable the most expensive debugging functionality
 	at runtime, run "ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20230629:
+	The heuristic for detecting old chromebooks with an EC bug that requires
+	atkbdc driver workarounds has changed. There should be no functional
+	change, but if your old chromebook's keyboard stops working, please
+	file a PR and assign it to imp.
+
 20230623:
 	OpenSSL has been updated to version 3.0, including changes throughout
 	the base system.  It is important to rebuild third-party software