Re: [PATCH] thermal/drivers/tegra/soctherm: Program throttrip with hot trip temperature

[Mikko Perttunen <mperttunen@nvidia.com>]

On Wednesday, October 21, 2026 4:18 AM Patrick Fischer via B4 Relay wrote:
> From: Patrick Fischer <admin@tsv-stahl-riesa.de>
> 
> tegra_soctherm_set_hwtrips() is supposed to program the hardware
> throttle trip (throttrip) with the temperature of the thermal zone's
> hot trip point. Since commit 735a968d2fea ("thermal/drivers/tegra: Use
> generic thermal_zone_get_trip() function"), get_hot_temp() only looks
> up the hot trip and no longer stores its temperature, and the later
> conversion to get_hot_trip() kept that behaviour. throttrip_program()
> is therefore called with the value still left in 'temperature', which
> is the thermtrip or critical temperature that was just used for
> thermtrip_program().
> 
> As a result, hardware throttling only starts at the shutdown
> temperature instead of at the hot trip. On the NVIDIA Tegra Note 7
> (P1640, Tegra114), where tegra114.dtsi defines the hot trips at 100 C
> and the critical trips at 102 C, soctherm reports:
> 
>   throttrip: will throttle when cpu reaches 102000 mC
> 
> instead of 100000 mC. Svyatoslav Ryhel observed the same on the ASUS
> Transformer Pad TF701T (Tegra114) and the Xiaomi Mi Pad (Tegra124).
> All boards using soctherm with a hot trip bound to a throttle cooling
> device are affected.
> 
> Use the temperature of the hot trip for throttrip_program() again.
> 
> Fixes: 735a968d2fea ("thermal/drivers/tegra: Use generic thermal_zone_get_trip() function")
> Cc: stable@vger.kernel.org
> Assisted-by: LLM
> Tested-by: Svyatoslav Ryhel <clamor95@gmail.com>
> Signed-off-by: Patrick Fischer <admin@tsv-stahl-riesa.de>
> ---
>  drivers/thermal/tegra/soctherm.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/thermal/tegra/soctherm.c b/drivers/thermal/tegra/soctherm.c
> index f74acf13b24d..903215502606 100644
> --- a/drivers/thermal/tegra/soctherm.c
> +++ b/drivers/thermal/tegra/soctherm.c
> @@ -765,6 +765,8 @@ static int tegra_soctherm_set_hwtrips(struct device *dev,
>  		return 0;
>  	}
>  
> +	temperature = hot_trip->temperature;
> +
>  	for (i = 0; i < THROTTLE_OC1; i++) {
>  		struct thermal_cooling_device *cdev;
>  
> 
> ---
> base-commit: f47d223627f80cb7a1eb14c585fe6cb35de5e984
> change-id: 20261020-upstream-soctherm-throttrip-ad6965977b6c
> 
> Best regards,
> --  
> Patrick Fischer <admin@tsv-stahl-riesa.de>
> 
> 
> 

Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>