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Date: Mon, 22 Jan 2024 19:50:27 +0200
From: Iuliana Prodan <iuliana.prodan@....com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org
Cc: Sudeep Holla <sudeep.holla@....com>, Kevin Hilman <khilman@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Bjorn Andersson <andersson@...nel.org>, Nikunj Kela <nkela@...cinc.com>,
Prasad Sodagudi <psodagud@...cinc.com>, Stephan Gerhold
<stephan@...hold.net>, Ben Horgan <Ben.Horgan@....com>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-remoteproc@...r.kernel.org, linux-media@...r.kernel.org,
Mathieu Poirier <mathieu.poirier@...aro.org>, Shawn Guo
<shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
Daniel Baluta <daniel.baluta@....com>
Subject: Re: [PATCH v2 2/5] remoteproc: imx_dsp_rproc: Convert to
dev_pm_domain_attach|detach_list()
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@...aro.org>
> Cc: Bjorn Andersson <andersson@...nel.org>
> Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: Sascha Hauer <s.hauer@...gutronix.de>
> Cc: Iuliana Prodan <iuliana.prodan@....com>
> Cc: Daniel Baluta <daniel.baluta@....com>
> Cc: <linux-remoteproc@...r.kernel.org>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.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@....com>
Reviewed-by: Iuliana Prodan <iuliana.prodan@....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);
> }
>
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