linux-kernel - Re: [PATCH v2 12/12] remoteproc: stm32: Set synchronisation state machine if needed

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Message-ID: <defc59b2-4d64-a108-2e5e-ecc579f70a8b@st.com>
Date:   Wed, 29 Apr 2020 16:47:19 +0200
From:   Arnaud POULIQUEN <arnaud.pouliquen@...com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        <bjorn.andersson@...aro.org>, <ohad@...ery.com>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>
CC:     <loic.pallardy@...com>, <linux-remoteproc@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 12/12] remoteproc: stm32: Set synchronisation state
 machine if needed



On 4/24/20 10:25 PM, Mathieu Poirier wrote:
> Set the flags and operations to use if the M4 has been started
> by another entity than the remoteproc core.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  drivers/remoteproc/stm32_rproc.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
> index dcae6103e3df..02dad3f51c7a 100644
> --- a/drivers/remoteproc/stm32_rproc.c
> +++ b/drivers/remoteproc/stm32_rproc.c
> @@ -598,13 +598,20 @@ static struct rproc_ops st_rproc_ops = {
>  	.get_boot_addr	= rproc_elf_get_boot_addr,
>  };
>  
> -static __maybe_unused struct rproc_ops st_rproc_sync_ops = {
> +static struct rproc_ops st_rproc_sync_ops = {
>  	.start		= stm32_rproc_sync_start,
>  	.stop		= stm32_rproc_stop,
> +	.kick		= stm32_rproc_kick,

Seems independent of the path.

>  	.parse_fw       = stm32_rproc_sync_parse_fw,
>  	.find_loaded_rsc_table = stm32_rproc_sync_elf_find_loaded_rsc_table,
>  };
>  
> +static struct rproc_sync_flags st_sync_flags = {
> +	.on_init = true, /* sync with MCU when the kernel boots */
> +	.after_stop = false, /* don't resync with MCU if stopped from sysfs */
> +	.after_crash = false, /* don't resync with MCU after a crash */
> +};
> +
could be const

>  static const struct of_device_id stm32_rproc_match[] = {
>  	{ .compatible = "st,stm32mp1-m4" },
>  	{},
> @@ -803,6 +810,7 @@ static int stm32_rproc_probe(struct platform_device *pdev)
>  	struct stm32_rproc *ddata;
>  	struct device_node *np = dev->of_node;
>  	struct rproc *rproc;
> +	struct rproc_sync_flags sync_flags = {0};
>  	unsigned int state;
>  	bool auto_boot = false;
>  	int ret;
> @@ -837,11 +845,17 @@ static int stm32_rproc_probe(struct platform_device *pdev)
>  	}
>  
>  	if (state == M4_STATE_CRUN) {
> +		auto_boot = true;
> +		sync_flags = st_sync_flags;

seems an useless copy 

Regards,
Arnaud

>  		ret = stm32_rproc_get_loaded_rsc_table(pdev, ddata);
>  		if (ret)
>  			goto free_rproc;
>  	}
>  
> +	ret = rproc_set_state_machine(rproc, &st_rproc_sync_ops, sync_flags);
> +	if (ret)
> +		goto free_rproc;
> +
>  	rproc->auto_boot = auto_boot;
>  	rproc->has_iommu = false;
>  	ddata->workqueue = create_workqueue(dev_name(dev));
>