[XS] Change in coreboot[master]: mb/google/rex: enable d3hot for storage devices

[Sukumar Ghorai (Code Review)]

Attention is currently required from: Eric Lai, Jakub Czapiga, Kangheui Won, Kapil Porwal, Sukumar Ghorai, Sumeet R Pawnikar, Tarun Tuli.

Hello Jakub Czapiga, Kangheui Won, Kapil Porwal, Subrata Banik, Sumeet R Pawnikar, Tarun Tuli, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/76835?usp=email

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

The following approvals got outdated and were removed:
Code-Review+1 by Kangheui Won, Code-Review+2 by Kapil Porwal, Code-Review+2 by Sumeet R Pawnikar, Verified+1 by build bot (Jenkins)

Change subject: mb/google/rex: enable d3hot for storage devices
......................................................................

mb/google/rex: enable d3hot for storage devices

_DSD "StorageD3Enable" property is needs to be set under the root
port in the DSDT or SSDT. The ACPI _DSD method is the preferred way
to opt D3hot support for storage devices.

This also bypasses the low LTR from SSD that blocking S0i2.2
LTR/latency SoC requirement.

Name (_DSD, Package () {
    ToUUID("5025030F-842F-4AB4-A561-99A5189762D0"),
        Package () {
            Package (2) {"StorageD3Enable", 1},
            // 1 - Enable; 0 - Disable
        }
    }
)

BUG=b:289028958
TEST=Check code compiles & boot rex, and verify the "StorageD3Enable"
SSDT entry.

Change-Id: I19decc2706954e73bc28fc2d9c3c4d18d2c384b7
Signed-off-by: Kangheui Won 
Signed-off-by: Sukumar Ghorai 
---
M src/mainboard/google/rex/variants/rex0/overridetree.cb
1 file changed, 7 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/35/76835/4