linux-kernel - Re: [PATCH v2] thermal: tegra-bpmp: Handle offline zones

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Message-ID: <ZCW47Ux5wa9XYd6j@orome>
Date:   Thu, 30 Mar 2023 18:29:33 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Mikko Perttunen <cyndis@...si.fi>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] thermal: tegra-bpmp: Handle offline zones

On Thu, Mar 30, 2023 at 12:49:04PM +0300, Mikko Perttunen wrote:
> From: Mikko Perttunen <mperttunen@...dia.com>
> 
> Thermal zones located in power domains may not be accessible when
> the domain is powergated. In this situation, reading the temperature
> will return -BPMP_EFAULT. When evaluating trips, BPMP will internally
> use -256C as the temperature for offline zones.
> 
> For smooth operation, for offline zones, return -EAGAIN when reading
> the temperature and allow registration of zones even if they are
> offline during probe.
> 
> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
> ---
> v2:
> * Adjusted commit message.
> * Patch 2/2 dropped for now since it is more controversial,
>   and this patch is more critical.
> 
>  drivers/thermal/tegra/tegra-bpmp-thermal.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)

Acked-by: Thierry Reding <treding@...dia.com>

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