[PATCH] drm/panfrost: make devfreq optional again

[Ezequiel Garcia]

On Fri, 2019-05-31 at 14:37 +0200, Neil Armstrong wrote:
> Devfreq runtime usage was made mandatory, thus making panfrost fail to probe
> on Amlogic S912 SoCs missin the "operating-points-v2" property.
> Make it optional again, leaving PM_DEVFREQ is selected by default.
> 
> Fixes: f3617b449d ("drm/panfrost: Select devfreq")
> Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
> ---
>  drivers/gpu/drm/panfrost/panfrost_devfreq.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> index 29fcffdf2d57..dc75f99ad53b 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
> @@ -140,7 +140,9 @@ int panfrost_devfreq_init(struct panfrost_device *pfdev)
>  		return 0;
>  
>  	ret = dev_pm_opp_of_add_table(&pfdev->pdev->dev);
> -	if (ret)
> +	if (ret == -ENODEV) /* Optional, continue without devfreq */
> +		return 0;
> +	else
>  		return ret;
>  

This looks incorrect, should be:

       else if (ret)
                return ret;

Otherwise, if ret == 0, we are bailing out.

Thanks,
Eze