RE: [PATCH V3 4/6] remoteproc: imx_rproc: support kicking Mcore from Linux for i.MX8QXP

[Peng Fan]

> Subject: Re: [PATCH V3 4/6] remoteproc: imx_rproc: support kicking Mcore
> from Linux for i.MX8QXP
> 
> On Tue, May 17, 2022 at 02:49:35PM +0800, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@xxxxxxx>
> >
> > When M4 is in the same hardware partition with Cortex-A, it could be
> > start/stop by Linux.
> >
> > Added power domain to make sure M4 could run, it requires several
> > power domains to work. Make clk always optional for i.MX8QXP, because
> > SCFW handles it when power up M4 core.
> >
> > Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> > ---
> >  drivers/remoteproc/imx_rproc.c | 69
> > +++++++++++++++++++++++++++++++++-
> >  1 file changed, 67 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/remoteproc/imx_rproc.c
> > b/drivers/remoteproc/imx_rproc.c index 2e751fc90760..49cce9dd55c7
> > 100644
> > --- a/drivers/remoteproc/imx_rproc.c
> > +++ b/drivers/remoteproc/imx_rproc.c
> > @@ -16,6 +16,7 @@
> >  #include <linux/of_reserved_mem.h>
> >  #include <linux/of_device.h>
> >  #include <linux/platform_device.h>
> > +#include <linux/pm_domain.h>
> >  #include <linux/regmap.h>
> >  #include <linux/remoteproc.h>
> >  #include <linux/workqueue.h>
> > @@ -96,6 +97,10 @@ struct imx_rproc {
> >  	struct notifier_block		rproc_nb;
> >  	u32				rproc_pt;	/* partition id */
> >  	u32				rsrc_id;	/* resource id */
> > +	u32				entry;		/* cpu start address */
> > +	int                             num_pd;
> > +	struct device                   **pd_dev;
> > +	struct device_link              **pd_dev_link;
> >  };
> >
> >  static const struct imx_rproc_att imx_rproc_att_imx93[] = { @@ -335,6
> > +340,9 @@ static int imx_rproc_start(struct rproc *rproc)
> >  		arm_smccc_smc(IMX_SIP_RPROC, IMX_SIP_RPROC_START, 0, 0, 0, 0,
> 0, 0, &res);
> >  		ret = res.a0;
> >  		break;
> > +	case IMX_RPROC_SCU_API:
> > +		ret = imx_sc_pm_cpu_start(priv->ipc_handle, priv->rsrc_id, true,
> priv->entry);
> > +		break;
> >  	default:
> >  		return -EOPNOTSUPP;
> >  	}
> > @@ -364,6 +372,9 @@ static int imx_rproc_stop(struct rproc *rproc)
> >  		if (res.a1)
> >  			dev_info(dev, "Not in wfi, force stopped\n");
> >  		break;
> > +	case IMX_RPROC_SCU_API:
> > +		ret = imx_sc_pm_cpu_start(priv->ipc_handle, priv->rsrc_id, false,
> priv->entry);
> > +		break;
> >  	default:
> >  		return -EOPNOTSUPP;
> >  	}
> > @@ -724,6 +735,56 @@ static int imx_rproc_partition_notify(struct
> notifier_block *nb,
> >  	return 0;
> >  }
> >
> > +static int imx_rproc_attach_pd(struct imx_rproc *priv) {
> > +	struct device *dev = priv->dev;
> > +	int ret, i;
> > +
> > +	priv->num_pd = of_count_phandle_with_args(dev->of_node,
> "power-domains",
> > +						  "#power-domain-cells");
> > +	if (priv->num_pd < 0)
> > +		return priv->num_pd;
> > +
> > +	if (!priv->num_pd)
> > +		return 0;
> > +
> > +	priv->pd_dev = devm_kmalloc_array(dev, priv->num_pd,
> sizeof(*priv->pd_dev), GFP_KERNEL);
> > +	if (!priv->pd_dev)
> > +		return -ENOMEM;
> > +
> > +	priv->pd_dev_link = devm_kmalloc_array(dev, priv->num_pd,
> sizeof(*priv->pd_dev_link),
> > +					       GFP_KERNEL);
> > +
> > +	if (!priv->pd_dev_link)
> > +		return -ENOMEM;
> > +
> > +	for (i = 0; i < priv->num_pd; 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_pd;
> > +		}
> > +
> > +		priv->pd_dev_link[i] = device_link_add(dev, priv->pd_dev[i],
> DL_FLAG_STATELESS |
> > +						       DL_FLAG_PM_RUNTIME |
> DL_FLAG_RPM_ACTIVE);
> > +		if (!priv->pd_dev_link[i]) {
> > +			dev_pm_domain_detach(priv->pd_dev[i], false);
> > +			ret = -EINVAL;
> > +			goto detach_pd;
> > +		}
> > +	}
> > +
> > +	return 0;
> > +
> > +detach_pd:
> > +	while (--i >= 0) {
> > +		device_link_del(priv->pd_dev_link[i]);
> > +		dev_pm_domain_detach(priv->pd_dev[i], false);
> 
> Same here - why are these not called during driver removal and along the error
> path in probe()?

Will add that, with a function imx_rproc_detach_pd

Thanks,
Peng.

> 
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> >  static int imx_rproc_detect_mode(struct imx_rproc *priv)  {
> >  	struct regmap_config config = { .name = "imx-rproc" }; @@ -758,8
> > +819,12 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
> >  		 * If Mcore resource is not owned by Acore partition, It is kicked by
> ROM,
> >  		 * and Linux could only do IPC with Mcore and nothing else.
> >  		 */
> > -		if (imx_sc_rm_is_resource_owned(priv->ipc_handle, priv->rsrc_id))
> > -			return 0;
> > +		if (imx_sc_rm_is_resource_owned(priv->ipc_handle, priv->rsrc_id)) {
> > +			if (of_property_read_u32(dev->of_node, "fsl,entry-address",
> &priv->entry))
> > +				return -EINVAL;
> > +
> > +			return imx_rproc_attach_pd(priv);
> > +		}
> >
> >  		priv->rproc->state = RPROC_DETACHED;
> >  		priv->rproc->recovery_disabled = true;
> > --
> > 2.25.1
> >