[S] Change in coreboot[main]: mb/lenovo/m900_tiny: enable power LED blink in S3 and S4

[Michał Kopeć (Code Review)]

Attention is currently required from: Alexander Couzens, Maciej Pijanowski, Martin L Roth, Michał Kopeć, Michał Żygowski.

Hello Alexander Couzens, Maciej Pijanowski, Martin L Roth, Michał Żygowski, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/84860?usp=email

to look at the new patch set (#7).

The following approvals got outdated and were removed:
Code-Review+2 by Martin L Roth, Verified+1 by build bot (Jenkins)

The change is no longer submittable: Code-Review and Verified are unsatisfied now.

Change subject: mb/lenovo/m900_tiny: enable power LED blink in S3 and S4
......................................................................

mb/lenovo/m900_tiny: enable power LED blink in S3 and S4

The power LED may be disabled by GPP_D1. The pin is PWM capable, so
configure it in PWM mode with a frequency of 0.5Hz, duty cycle of 50%
when entering sleep.

The result is that the power LED toggles on/off every second.

TEST=Boot to Windows 10, enter S3, and wake. The power LED will blink
when system is asleep and glow continuously when awake.

Change-Id: I121e0ef3e47aec1cacdace3f2af47a3fdacf69cf
Signed-off-by: Michał Kopeć 
---
M src/mainboard/lenovo/m900_tiny/Makefile.mk
M src/mainboard/lenovo/m900_tiny/gpio.c
M src/mainboard/lenovo/m900_tiny/ramstage.c
A src/mainboard/lenovo/m900_tiny/smihandler.c
4 files changed, 33 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/60/84860/7