Change in coreboot[master]: mb/google/brya/var/crota: Add reset and enable delay time for rtd3-cold

[Terry Chen (Code Review)]

Attention is currently required from: Terry Chen, Tim Wawrzynczak, Nick Vaccaro.
Hello build bot (Jenkins), Tim Wawrzynczak, Nick Vaccaro,

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

https://review.coreboot.org/c/coreboot/+/64393

to look at the new patch set (#4).

Change subject: mb/google/brya/var/crota: Add reset and enable delay time for rtd3-cold
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mb/google/brya/var/crota: Add reset and enable delay time for rtd3-cold

This CL adds the delay time into the RTD3 sequence, which will turn
off the eMMC controller (a true D3cold state) during the RTD3 sequence.
We checked power on sequence requires enable pin prior to reset pin
delay of 50ms and add delay of 20ms to meet the sequence on various
eMMC SKUs. Based on BH799BB_Preliminary_DS_R079_20201124.pdf in
chapter 7.2.

BUG=b:231291431
TEST=USE="project_crota" emerge-brya coreboot chromeos-bootimage

Signed-off-by: Terry Chen 
Change-Id: Id9bed46e801602f3f327753053ec6a1ceb0656e6
---
M src/mainboard/google/brya/variants/crota/overridetree.cb
1 file changed, 2 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/93/64393/4