linux-kernel - [PATCH v2 0/3] gov_power_allocator: Allow binding before cooling devices

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Date: Wed, 03 Apr 2024 16:31:39 +0500
From: Nikita Travkin via B4 Relay <devnull+nikita.trvn.ru@...nel.org>
To: Lukasz Luba <lukasz.luba@....com>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Daniel Lezcano <daniel.lezcano@...aro.org>, Zhang Rui <rui.zhang@...el.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, 
 linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Nikita Travkin <nikitos.tr@...il.com>, Nikita Travkin <nikita@...n.ru>
Subject: [PATCH v2 0/3] gov_power_allocator: Allow binding before cooling
 devices

Recent changes in IPA made it fail probing if the TZ has no cooling
devices attached on probe or no trip points defined.

This series restores prior behavior to:

- allow IPA to probe before cooling devices have attached;
- allow IPA to probe when the TZ has no passive/active trip points.

I've noticed that all thermal zones fail probing with -EINVAL on my
sc7180 based Acer Aspire 1 since 6.8. This series allows me to bring
them back.

Additionally there is a commit that supresses the "sustainable_power
will be estimated" warning on TZ that have no trip points (and thus IPA
will not be able to do anything for them anyway). This allowed me to
notice that some of the TZ with cooling_devices on my platform actually
lack the sustainable_power value.

Signed-off-by: Nikita Travkin <nikita@...n.ru>
---
Changes in v2:
- Split to two changes (Lukasz)
- Return 0 in allocate_actors_buffer() instead of suppressing -EINVAL
  (Lukasz)
- Add a change to supress "sustainable_power will be estimated" warning
  on "empty" TZ
- Link to v1: https://lore.kernel.org/r/20240321-gpa-no-cooling-devs-v1-1-5c9e0ef2062e@trvn.ru

---
Nikita Travkin (3):
      thermal: gov_power_allocator: Allow binding without cooling devices
      thermal: gov_power_allocator: Allow binding without trip points
      thermal: gov_power_allocator: Suppress sustainable_power warning without trip_points

 drivers/thermal/gov_power_allocator.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)
---
base-commit: 727900b675b749c40ba1f6669c7ae5eb7eb8e837
change-id: 20240321-gpa-no-cooling-devs-c79ee3288325

Best regards,
-- 
Nikita Travkin <nikita@...n.ru>