tree b3ab18849a2a1ed0692e1ad4d7274fdb95ca8f6d
parent 9305ccada13986d21ffaf874507f2d811d1ebe7b
author Subrata Banik <subratabanik@google.com> 1708440553 +0530
committer Subrata Banik <subratabanik@google.com> 1708833430 +0000

mb/google/rex/var/deku: Refactor SSD power sequencing

Improve SSD readiness time by enabling earlier power sequencing.

Here are the two GPIOs to look for:
* GPP_A19: Power Enable
* GPP_A20: PERST

The flow is presented as `stage (GPIO PAD/Value)` for easy
understanding:

bootblock (A20/0, A19/1)
|
v
romstage (A20/1)

Ideally, we don't need SSD power sequencing at ramstage, hence, remove
the logic from ramstage.

TEST=Able to build and boot google/deku using NVMe without any problems.
S0ix and read/write from/to SSD are also normal.

Change-Id: Iedaff8a793f1ba5d2b97352b95c4dfdd2b818ebd
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80664
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>