Enable dGPU power handling on Lenovo ThinkPad T430, T530 via PMH7
register 0x50.
Although there's no Thinker-1 chip on these models according to
schematics, dGPU power control via PMH7 works the same as on T420/T520,
so they can be considered Thinker-1-compatible.
It can be tested from linux userspace using util/pmh7tool.
To turn dGPU power off:
pmh7tool -c 0x50 7
pmh7tool -c 0x50 3
To turn it on:
pmh7tool -s 0x50 3
pmh7tool -s 0x50 7
To check whether it is on (bash):
reg=0x$(pmh7tool -r 0x50)
echo "$(( (( reg & 0x08 )) >> 3 ))"
or just `pmh7tool -b 0x50 3` with
https://review.coreboot.org/#/c/coreboot/+/28388/
Tested on ThinkPad W530.
Change-Id: Ieab1a33b3c680c757cc0999660b5cb7e122474cc
Signed-off-by: Evgeny Zinoviev <me@ch1p.com>
Reviewed-on: https://review.coreboot.org/28392
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
0186912f9e