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Date: Wed, 12 Oct 2022 15:45:18 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: andersson@...nel.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
linux-imx@....com, linux-remoteproc@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V6 4/7] remoteproc: imx_rproc: support kicking Mcore from
Linux for i.MX8QXP
On Thu, Sep 29, 2022 at 02:17:01PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
>
> 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@....com>
> ---
> drivers/remoteproc/imx_rproc.c | 88 ++++++++++++++++++++++++++++++++--
> 1 file changed, 85 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index a56aecae00c6..7d2e11aed0aa 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>
> @@ -79,6 +80,8 @@ struct imx_rproc_mem {
> #define ATT_OWN BIT(1)
> #define ATT_IOMEM BIT(2)
>
> +static int imx_rproc_detach_pd(struct rproc *rproc);
> +
> struct imx_rproc {
> struct device *dev;
> struct regmap *regmap;
> @@ -96,6 +99,10 @@ 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 +342,9 @@ 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 +374,9 @@ 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;
> }
> @@ -713,8 +726,10 @@ static void imx_rproc_put_scu(struct rproc *rproc)
> if (dcfg->method != IMX_RPROC_SCU_API)
> return;
>
> - if (imx_sc_rm_is_resource_owned(priv->ipc_handle, priv->rsrc_id))
> + if (imx_sc_rm_is_resource_owned(priv->ipc_handle, priv->rsrc_id)) {
> + imx_rproc_detach_pd(rproc);
> return;
> + }
>
> imx_scu_irq_group_enable(IMX_SC_IRQ_GROUP_REBOOTED, BIT(priv->rproc_pt), false);
> imx_scu_irq_unregister_notifier(&priv->rproc_nb);
> @@ -736,6 +751,69 @@ 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 <= 1)
What happens if we get 1 power domains? How is it handled? There should be a
comment explaining what is happening here.
> + 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);
> + }
> +
> + return ret;
> +}
> +
> +static int imx_rproc_detach_pd(struct rproc *rproc)
> +{
> + struct imx_rproc *priv = rproc->priv;
> + int i;
> +
> + if (priv->num_pd <= 1)
Same here.
With the above:
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> + return 0;
> +
> + for (i = 0; i < priv->num_pd; i++) {
> + device_link_del(priv->pd_dev_link[i]);
> + dev_pm_domain_detach(priv->pd_dev[i], false);
> + }
> +
> + return 0;
> +}
> +
> static int imx_rproc_detect_mode(struct imx_rproc *priv)
> {
> struct regmap_config config = { .name = "imx-rproc" };
> @@ -770,8 +848,12 @@ 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;
> --
> 2.37.1
>
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