[coreboot-gerrit] Change in coreboot[master]: mb/google/brya/var/primus{4es}: add delay time to rtd3-cold

[Terry Chen (Code Review)]

Hello build bot (Jenkins), Tim Wawrzynczak,

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

https://review.coreboot.org/c/coreboot/+/62949

to look at the new patch set (#6).

Change subject: mb/google/brya/var/primus{4es}: add delay time to rtd3-cold
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mb/google/brya/var/primus{4es}: add delay time to 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, added delay to meet the sequence and test passed on various eMMC SKUs.
Base on BH799BB_Preliminary_DS_R079_20201124.pdf in chapter 7.2.

BUG=b:224648680
TEST=USE="project_primus" emerge-brya coreboot chromeos-bootimage
          test suspend stress 2500 cycles passed on primus

Signed-off-by: Terry Chen 
Change-Id: I1ab4fdf0ee73b819b3c203e995ac9d5ae0d24bd0
---
M src/mainboard/google/brya/variants/primus/overridetree.cb
M src/mainboard/google/brya/variants/primus4es/overridetree.cb
2 files changed, 4 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/49/62949/6