[PATCH V6 7/7] remoteproc: imx_rproc: Enable attach recovery for i.MX8QM/QXP

[Peng Fan]

Hi Mathieu,

This patch is an incremental patch that could ignored, if you not have 
time or think this patch is not in good shape. Patch 1-6 is
to achieve same as V5 patchset [1].

[1]https://lore.kernel.org/linux-remoteproc/DU0PR04MB941763C3EBF8AE9A9CD69445884C9@DU0PR04MB9417.eurprd04.prod.outlook.com/T/#md2af773bc7f251efbe8ca011b5a70ba2193b4c01

Thanks,
Peng.
On 9/29/2022 2:17 PM, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan at nxp.com>
> 
> i.MX8QM/QXP M4 could recover without help from Linux, so to support it:
>   - enable feature RPROC_FEAT_ATTACH_ON_RECOVERY
>   - add detach hook
>   - Since we have detach callback, we could move the free mbox operation
>   from partition reset notify to detach callback.
> 
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
> ---
>   drivers/remoteproc/imx_rproc.c | 22 +++++++++++++++++++---
>   1 file changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index bece44b46719..4057d6f33813 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -603,6 +603,22 @@ static int imx_rproc_attach(struct rproc *rproc)
>   	return imx_rproc_xtr_mbox_init(rproc);
>   }
>   
> +static int imx_rproc_detach(struct rproc *rproc)
> +{
> +	struct imx_rproc *priv = rproc->priv;
> +	const struct imx_rproc_dcfg *dcfg = priv->dcfg;
> +
> +	if (dcfg->method != IMX_RPROC_SCU_API)
> +		return -EOPNOTSUPP;
> +
> +	if (imx_sc_rm_is_resource_owned(priv->ipc_handle, priv->rsrc_id))
> +		return -EOPNOTSUPP;
> +
> +	imx_rproc_free_mbox(rproc);
> +
> +	return 0;
> +}
> +
>   static struct resource_table *imx_rproc_get_loaded_rsc_table(struct rproc *rproc, size_t *table_sz)
>   {
>   	struct imx_rproc *priv = rproc->priv;
> @@ -618,6 +634,7 @@ static struct resource_table *imx_rproc_get_loaded_rsc_table(struct rproc *rproc
>   static const struct rproc_ops imx_rproc_ops = {
>   	.prepare	= imx_rproc_prepare,
>   	.attach		= imx_rproc_attach,
> +	.detach		= imx_rproc_detach,
>   	.start		= imx_rproc_start,
>   	.stop		= imx_rproc_stop,
>   	.kick		= imx_rproc_kick,
> @@ -797,8 +814,6 @@ static int imx_rproc_partition_notify(struct notifier_block *nb,
>   	if (!((event & BIT(priv->rproc_pt)) && (*(u8 *)group == IMX_SC_IRQ_GROUP_REBOOTED)))
>   		return 0;
>   
> -	imx_rproc_free_mbox(priv->rproc);
> -
>   	rproc_report_crash(priv->rproc, RPROC_WATCHDOG);
>   
>   	pr_info("Partition%d reset!\n", priv->rproc_pt);
> @@ -916,7 +931,8 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
>   		}
>   
>   		priv->rproc->state = RPROC_DETACHED;
> -		priv->rproc->recovery_disabled = true;
> +		priv->rproc->recovery_disabled = false;
> +		rproc_set_feature(priv->rproc, RPROC_FEAT_ATTACH_ON_RECOVERY);
>   
>   		/* Get partition id and enable irq in SCFW */
>   		ret = imx_sc_rm_get_resource_owner(priv->ipc_handle, priv->rsrc_id, &pt);