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thermal/drivers/tegra-bpmp: Handle offline zones

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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@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20230330094904.2589428-1-cyndis@kapsi.fi
This commit is contained in:
Mikko Perttunen 2023-03-30 12:49:04 +03:00 committed by Daniel Lezcano
parent fee5caec88
commit cdd6076b0a
1 changed files with 8 additions and 1 deletions
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9
drivers/thermal/tegra/tegra-bpmp-thermal.c
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@ -52,6 +52,8 @@ static int __tegra_bpmp_thermal_get_temp(struct tegra_bpmp_thermal_zone *zone,
err = tegra_bpmp_transfer(zone->tegra->bpmp, &msg);
if (err)
return err;
if (msg.rx.ret == -BPMP_EFAULT)
return -EAGAIN;
if (msg.rx.ret)
return -EINVAL;
@ -209,7 +211,12 @@ static int tegra_bpmp_thermal_probe(struct platform_device *pdev)
zone->tegra = tegra;
err = __tegra_bpmp_thermal_get_temp(zone, &temp);
if (err < 0) {
/*
* Sensors in powergated domains may temporarily fail to be read
* (-EAGAIN), but will become accessible when the domain is powered on.
*/
if (err < 0 && err != -EAGAIN) {
devm_kfree(&pdev->dev, zone);
continue;
}