[PATCH] drm/panfrost: Register devfreq cooling device

[Alyssa Rosenzweig]

Not sure if this was already pushed but:

	Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>

On Thu, Nov 28, 2019 at 08:54:27PM +0000, Robin Murphy wrote:
> When we have devfreq, also try to register a basic cooling device in
> case GPU workloads manage to hit thermal throttling thresholds.
> 
> Signed-off-by: Robin Murphy <robin.murphy at arm.com>
> ---
>  drivers/gpu/drm/panfrost/panfrost_devfreq.c | 32 ++++++++++++++-------
>  1 file changed, 21 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 4c4e8a30a1ac..fe8ee77c96e4 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /* Copyright 2019 Collabora ltd. */
>  #include <linux/devfreq.h>
> +#include <linux/devfreq_cooling.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_opp.h>
>  #include <linux/clk.h>
> @@ -81,8 +82,11 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>  	int ret;
>  	struct dev_pm_opp *opp;
>  	unsigned long cur_freq;
> +	struct device *dev = &pfdev->pdev->dev;
> +	struct devfreq *devfreq;
> +	struct thermal_cooling_device *cooling;
>  
> -	ret = dev_pm_opp_of_add_table(&pfdev->pdev->dev);
> +	ret = dev_pm_opp_of_add_table(dev);
>  	if (ret == -ENODEV) /* Optional, continue without devfreq */
>  		return 0;
>  	else if (ret)
> @@ -92,29 +96,35 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>  
>  	cur_freq = clk_get_rate(pfdev->clock);
>  
> -	opp = devfreq_recommended_opp(&pfdev->pdev->dev, &cur_freq, 0);
> +	opp = devfreq_recommended_opp(dev, &cur_freq, 0);
>  	if (IS_ERR(opp))
>  		return PTR_ERR(opp);
>  
>  	panfrost_devfreq_profile.initial_freq = cur_freq;
>  	dev_pm_opp_put(opp);
>  
> -	pfdev->devfreq.devfreq = devm_devfreq_add_device(&pfdev->pdev->dev,
> -			&panfrost_devfreq_profile, DEVFREQ_GOV_SIMPLE_ONDEMAND,
> -			NULL);
> -	if (IS_ERR(pfdev->devfreq.devfreq)) {
> -		DRM_DEV_ERROR(&pfdev->pdev->dev, "Couldn't initialize GPU devfreq\n");
> -		ret = PTR_ERR(pfdev->devfreq.devfreq);
> -		pfdev->devfreq.devfreq = NULL;
> -		dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
> -		return ret;
> +	devfreq = devm_devfreq_add_device(dev, &panfrost_devfreq_profile,
> +					  DEVFREQ_GOV_SIMPLE_ONDEMAND, NULL);
> +	if (IS_ERR(devfreq)) {
> +		DRM_DEV_ERROR(dev, "Couldn't initialize GPU devfreq\n");
> +		dev_pm_opp_of_remove_table(dev);
> +		return PTR_ERR(devfreq);
>  	}
> +	pfdev->devfreq.devfreq = devfreq;
> +
> +	cooling = of_devfreq_cooling_register(dev->of_node, devfreq);
> +	if (IS_ERR(cooling))
> +		DRM_DEV_INFO(dev, "Failed to register cooling device\n");
> +	else
> +		pfdev->devfreq.cooling = cooling;
>  
>  	return 0;
>  }
>  
>  void panfrost_devfreq_fini(struct panfrost_device *pfdev)
>  {
> +	if (pfdev->devfreq.cooling)
> +		devfreq_cooling_unregister(pfdev->devfreq.cooling);
>  	dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
>  }
>  
> -- 
> 2.17.1
> 
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