tree 0f9bf9d663fbbed1c895d73593d36973196a53c5
parent 313fdb28ca6b6479c3305d8a385389de0b2290dd
author Subrata Banik <subratabanik@google.com> 1708440523 +0530
committer Subrata Banik <subratabanik@google.com> 1708833419 +0000

mb/google/rex/var/karis: 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)
|
v
ramstage (A19/1, A20/1)

Ideally, we don't need SSD power sequencing at ramstage, but due to the
fact that Karis has RO locked, any change in the bootblock won't be
applicable for FSI'ed karis devices. Therefore, we're keeping the
existing ramstage power sequencing flow as is

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

Change-Id: I79171a7830b75f5c20bbe30023f2814a62743a13
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80663
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Tyler Wang <tyler.wang@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>