tree 231b86e51c43fbafadfbda9b894cd84fc1de8df9
parent 41113fdb910994d3838b1e60ea5498f26e394343
author Pavan Holla <pholla@chromium.org> 1639105084 +0000
committer Commit Bot <commit-bot@chromium.org> 1642067510 +0000

hermes: Inhibit during all eSIM operations.

Motivation:
1) Notifications after profile operations were previously disabled.
However, due to certification requirements, these need to be sent. To
send notifications, we need to acquire a channel after a profile
operation. However, MM is starting around the same time, and there is a
race to acquire a channel. Thus, we need to inhibit MM until
notifications are sent.

2) Inhibiting MM while Hermes effectively acquires a lock on the modem.
   It prevents fw updates and slot switches while Hermes is active.

3) Inhibit and Uninhibiting makes MM start from a clean state after
   eSIM operations. MM was previously required to reprobe after a slot
   switch or a profile switch. Since uninhibiting involves a reprobe,
   this is no longer a requirement.

BUG=b:202401139
TEST=tast -verbose run ${cr} cellular.HermesMultiProfile

Cq-Depend: chromium:3379869, chromium:3379870
Change-Id: I68b9b186cec2ce911f9585797b671d859303b85f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/3330727
Reviewed-by: Eric Caruso <ejcaruso@chromium.org>
Tested-by: Pavan Holla <pholla@google.com>
Commit-Queue: Pavan Holla <pholla@google.com>