On 04/03/2021 16:06, Chanwoo Choi wrote:
> Hi Daniel,
>
> As Lukasz's comment, actually some devfreq devices like memory bus
> might not affect the thermal critically. In the mainline,
> there are four types devfreq as following:
> 1. GPU
> 2. UFS Storage
> 3. DMC (Memory Controller)
> 4. Memory bus like AMBA AXI
>
> I think that you can specify this devfreq device will be used
> for cooling device by editing the devfreq_dev_profile structure.
Thanks for the suggestion, it makes sense.
I will do the change following your example below.
-- Daniel
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index bf3047896e41..77966a17d03f 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -935,6 +935,13 @@ struct devfreq *devfreq_add_device(struct device *dev,
>
> mutex_unlock(&devfreq_list_lock);
>
> + if (devfreq->profile->is_cooling_device) {
> + devfreq->cdev = devfreq_cooling_em_register(devfreq, NULL);
> + if (IS_ERR(devfreq->cdev))
> + dev_info(dev,
> + "Failed to register devfreq cooling
> device\n");
> + }
> +
> return devfreq;
>
> err_init:
> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
> index 26ea0850be9b..26dc69f1047b 100644
> --- a/include/linux/devfreq.h
> +++ b/include/linux/devfreq.h
> @@ -103,6 +103,7 @@ struct devfreq_dev_profile {
> unsigned long initial_freq;
> unsigned int polling_ms;
> enum devfreq_timer timer;
> + bool is_cooling_device;
>
> int (*target)(struct device *dev, unsigned long *freq, u32 flags);
> int (*get_dev_status)(struct device *dev,
>
--
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