linux-kernel - Re: [PATCH v2 3/3] thermal: gov_power_allocator: Suppress sustainable_power warning without trip

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Message-ID: <187a3acb-d4a8-41e6-822c-f901a693aae1@arm.com>
Date: Wed, 3 Apr 2024 13:52:25 +0100
From: Lukasz Luba <lukasz.luba@....com>
To: Nikita Travkin <nikitos.tr@...il.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
 "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, linux-pm@...r.kernel.org,
 Zhang Rui <rui.zhang@...el.com>, Daniel Lezcano <daniel.lezcano@...aro.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] thermal: gov_power_allocator: Suppress
 sustainable_power warning without trip_points

On 4/3/24 12:31, Nikita Travkin via B4 Relay wrote:
> From: Nikita Travkin <nikita@...n.ru>
> 
> IPA warns if the thermal zone it was attached to doesn't define
> sustainable_power value. In some cases though IPA may be bound to an
> "empty" TZ, in which case the lack of sustainable_power doesn't matter.
> 
> Suppress the warning in case when IPA is bound to an empty TZ to make it
> easier to see the warnings that actually matter.
> 
> Signed-off-by: Nikita Travkin <nikita@...n.ru>
> ---
> 
> I've decided to add this along to supress those warnings for some TZ on
> sc7180. Feel free to drop this patch if you think the warning should
> always appear.

That warning should stay, since in the development or integration phase
quite a lot of stuff is missing. This will warn that there is an issue.
The case with 'empty' TZ is an exception only to 'work' with IPA.

Thanks for the patches!

Regards,
Lukasz

> ---
>   drivers/thermal/gov_power_allocator.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c
> index e25e48d76aa7..05a40f6b5928 100644
> --- a/drivers/thermal/gov_power_allocator.c
> +++ b/drivers/thermal/gov_power_allocator.c
> @@ -704,7 +704,7 @@ static int power_allocator_bind(struct thermal_zone_device *tz)
>   		params->allocated_tzp = true;
>   	}
>   
> -	if (!tz->tzp->sustainable_power)
> +	if (!tz->tzp->sustainable_power && params->trip_max)
>   		dev_warn(&tz->device, "power_allocator: sustainable_power will be estimated\n");
>   	else
>   		params->sustainable_power = tz->tzp->sustainable_power;
>