Re: [PATCH v2 2/5] remoteproc: imx_dsp_rproc: Convert to dev_pm_domain_attach|detach_list()

[Iuliana Prodan <iuliana.prodan@nxp.com>]

On 1/5/2024 6:01 PM, Ulf Hansson wrote:
> Let's avoid the boilerplate code to manage the multiple PM domain case, by
> converting into using dev_pm_domain_attach|detach_list().
>
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Cc: Bjorn Andersson <andersson@kernel.org>
> Cc: Shawn Guo <shawnguo@kernel.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Iuliana Prodan <iuliana.prodan@nxp.com>
> Cc: Daniel Baluta <daniel.baluta@nxp.com>
> Cc: <linux-remoteproc@vger.kernel.org>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
>
> Changes in v2:
> 	- None.
>
> Iuliana/Daniel I am ccing you to request help with test/review of this change.
> Note that, you will need patch 1/5 in the series too, to be able to test this.
>
> Kind regards
> Ulf Hansson

Sorry for the delay in responding, your patchset was lost in the shuffle.

Tested-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Reviewed-by: Iuliana Prodan <iuliana.prodan@nxp.com>

Iulia


> ---
>   drivers/remoteproc/imx_dsp_rproc.c | 82 ++++--------------------------
>   1 file changed, 9 insertions(+), 73 deletions(-)
>
> diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
> index 8fcda9b74545..0409b7c47d5c 100644
> --- a/drivers/remoteproc/imx_dsp_rproc.c
> +++ b/drivers/remoteproc/imx_dsp_rproc.c
> @@ -103,12 +103,10 @@ enum imx_dsp_rp_mbox_messages {
>    * @tx_ch: mailbox tx channel handle
>    * @rx_ch: mailbox rx channel handle
>    * @rxdb_ch: mailbox rx doorbell channel handle
> - * @pd_dev: power domain device
> - * @pd_dev_link: power domain device link
> + * @pd_list: power domain list
>    * @ipc_handle: System Control Unit ipc handle
>    * @rproc_work: work for processing virtio interrupts
>    * @pm_comp: completion primitive to sync for suspend response
> - * @num_domains: power domain number
>    * @flags: control flags
>    */
>   struct imx_dsp_rproc {
> @@ -121,12 +119,10 @@ struct imx_dsp_rproc {
>   	struct mbox_chan			*tx_ch;
>   	struct mbox_chan			*rx_ch;
>   	struct mbox_chan			*rxdb_ch;
> -	struct device				**pd_dev;
> -	struct device_link			**pd_dev_link;
> +	struct dev_pm_domain_list		*pd_list;
>   	struct imx_sc_ipc			*ipc_handle;
>   	struct work_struct			rproc_work;
>   	struct completion			pm_comp;
> -	int					num_domains;
>   	u32					flags;
>   };
>   
> @@ -954,74 +950,14 @@ static const struct rproc_ops imx_dsp_rproc_ops = {
>   static int imx_dsp_attach_pm_domains(struct imx_dsp_rproc *priv)
>   {
>   	struct device *dev = priv->rproc->dev.parent;
> -	int ret, i;
> -
> -	priv->num_domains = of_count_phandle_with_args(dev->of_node,
> -						       "power-domains",
> -						       "#power-domain-cells");
> -
> -	/* If only one domain, then no need to link the device */
> -	if (priv->num_domains <= 1)
> -		return 0;
> -
> -	priv->pd_dev = devm_kmalloc_array(dev, priv->num_domains,
> -					  sizeof(*priv->pd_dev),
> -					  GFP_KERNEL);
> -	if (!priv->pd_dev)
> -		return -ENOMEM;
> -
> -	priv->pd_dev_link = devm_kmalloc_array(dev, priv->num_domains,
> -					       sizeof(*priv->pd_dev_link),
> -					       GFP_KERNEL);
> -	if (!priv->pd_dev_link)
> -		return -ENOMEM;
> -
> -	for (i = 0; i < priv->num_domains; i++) {
> -		priv->pd_dev[i] = dev_pm_domain_attach_by_id(dev, i);
> -		if (IS_ERR(priv->pd_dev[i])) {
> -			ret = PTR_ERR(priv->pd_dev[i]);
> -			goto detach_pm;
> -		}
> -
> -		/*
> -		 * device_link_add will check priv->pd_dev[i], if it is
> -		 * NULL, then will break.
> -		 */
> -		priv->pd_dev_link[i] = device_link_add(dev,
> -						       priv->pd_dev[i],
> -						       DL_FLAG_STATELESS |
> -						       DL_FLAG_PM_RUNTIME);
> -		if (!priv->pd_dev_link[i]) {
> -			dev_pm_domain_detach(priv->pd_dev[i], false);
> -			ret = -EINVAL;
> -			goto detach_pm;
> -		}
> -	}
> -
> -	return 0;
> -
> -detach_pm:
> -	while (--i >= 0) {
> -		device_link_del(priv->pd_dev_link[i]);
> -		dev_pm_domain_detach(priv->pd_dev[i], false);
> -	}
> -
> -	return ret;
> -}
> -
> -static int imx_dsp_detach_pm_domains(struct imx_dsp_rproc *priv)
> -{
> -	int i;
> +	int ret;
>   
> -	if (priv->num_domains <= 1)
> +	/* A single PM domain is already attached. */
> +	if (dev->pm_domain)
>   		return 0;
>   
> -	for (i = 0; i < priv->num_domains; i++) {
> -		device_link_del(priv->pd_dev_link[i]);
> -		dev_pm_domain_detach(priv->pd_dev[i], false);
> -	}
> -
> -	return 0;
> +	ret = dev_pm_domain_attach_list(dev, NULL, &priv->pd_list);
> +	return ret < 0 ? ret : 0;
>   }
>   
>   /**
> @@ -1153,7 +1089,7 @@ static int imx_dsp_rproc_probe(struct platform_device *pdev)
>   	return 0;
>   
>   err_detach_domains:
> -	imx_dsp_detach_pm_domains(priv);
> +	dev_pm_domain_detach_list(priv->pd_list);
>   err_put_rproc:
>   	rproc_free(rproc);
>   
> @@ -1167,7 +1103,7 @@ static void imx_dsp_rproc_remove(struct platform_device *pdev)
>   
>   	pm_runtime_disable(&pdev->dev);
>   	rproc_del(rproc);
> -	imx_dsp_detach_pm_domains(priv);
> +	dev_pm_domain_detach_list(priv->pd_list);
>   	rproc_free(rproc);
>   }
>