Change in coreboot[master]: soc/intel/adl: Remove IOM Mctp command from TCSS ASL

[Maulik V Vaghela (Code Review)]

Attention is currently required from: Shobhit Srivastava, Subrata Banik, Maulik V Vaghela, Kane Chen, Sridhar Siricilla.
Hello build bot (Jenkins), Shobhit Srivastava, Subrata Banik, Tim Wawrzynczak, Sridhar Siricilla, Kane Chen,

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

https://review.coreboot.org/c/coreboot/+/62861

to look at the new patch set (#3).

Change subject: soc/intel/adl: Remove IOM Mctp command from TCSS ASL
......................................................................

soc/intel/adl: Remove IOM Mctp command from TCSS ASL

TCSS ASL code was carried forward from TGL and it used to follow the same
sequence.

Recently as part of s0ix hang issue, it was found that sending IOM
MCTP command as part of TCSS D3 Cold enter-exit sequence created an
issue.

We discovered that due to change in hardware sequence, ADL should not
set/reset IOM MCTP during D3 cold entry or exit. This patch removes the
bit setting from ASL file to prevent hang in the system.

This patch also removes obsolete Pcode mailbox communication which is
no longer required for ADL.

BUG=b:220796339
BRANCH=firmware-brya-14505.B
TEST=Check if hang issue is resolved with the CL and no other regression
observed

Change-Id: I2f066bcc4a8f475a15ddd12ef5ed87d7298312bb
Signed-off-by: Maulik V Vaghela 
Signed-off-by: Kane Chen 
---
M src/soc/intel/alderlake/acpi/tcss.asl
1 file changed, 1 insertion(+), 142 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/61/62861/3