linux-kernel - Re: [PATCH v2 1/2] remoteproc: imx_dsp_rproc: Add support of recovery process

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Message-ID: <aG_SosukEqUxrHvH@p14s>
Date: Thu, 10 Jul 2025 08:48:02 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Shengjiu Wang <shengjiu.wang@....com>, iuliana.prodan@....com,
	daniel.baluta@....com
Cc: andersson@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
	kernel@...gutronix.de, festevam@...il.com,
	linux-remoteproc@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] remoteproc: imx_dsp_rproc: Add support of
 recovery process

On Fri, Jul 04, 2025 at 01:25:28PM +0800, Shengjiu Wang wrote:
> When recovery is triggered, rproc_stop() is called first then
> rproc_start(), but there is no rproc_unprepare_device() and
> rproc_prepare_device() in the flow. As the software reset is needed
> before DSP starts, so move software reset from imx_dsp_runtime_resume()
> to .load() to make the recovery work. And make sure memory is cleared
> before loading firmware.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> ---
>  drivers/remoteproc/imx_dsp_rproc.c | 43 +++++++++++++++++++-----------
>  1 file changed, 27 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
> index 5ee622bf5352..ba764fc55686 100644
> --- a/drivers/remoteproc/imx_dsp_rproc.c
> +++ b/drivers/remoteproc/imx_dsp_rproc.c
> @@ -774,7 +774,6 @@ static int imx_dsp_rproc_prepare(struct rproc *rproc)
>  {
>  	struct imx_dsp_rproc *priv = rproc->priv;
>  	struct device *dev = rproc->dev.parent;
> -	struct rproc_mem_entry *carveout;
>  	int ret;
>  
>  	ret = imx_dsp_rproc_add_carveout(priv);
> @@ -785,15 +784,6 @@ static int imx_dsp_rproc_prepare(struct rproc *rproc)
>  
>  	pm_runtime_get_sync(dev);
>  
> -	/*
> -	 * Clear buffers after pm rumtime for internal ocram is not
> -	 * accessible if power and clock are not enabled.
> -	 */
> -	list_for_each_entry(carveout, &rproc->carveouts, node) {
> -		if (carveout->va)
> -			memset(carveout->va, 0, carveout->len);
> -	}
> -
>  	return  0;
>  }
>  
> @@ -1022,13 +1012,39 @@ static int imx_dsp_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw
>  	return 0;
>  }
>  
> +static int imx_dsp_rproc_load(struct rproc *rproc, const struct firmware *fw)
> +{
> +	struct imx_dsp_rproc *priv = rproc->priv;
> +	const struct imx_dsp_rproc_dcfg *dsp_dcfg = priv->dsp_dcfg;
> +	struct rproc_mem_entry *carveout;
> +	int ret;
> +
> +	/* Reset DSP if needed */
> +	if (dsp_dcfg->reset)
> +		dsp_dcfg->reset(priv);
> +	/*
> +	 * Clear buffers after pm rumtime for internal ocram is not
> +	 * accessible if power and clock are not enabled.
> +	 */
> +	list_for_each_entry(carveout, &rproc->carveouts, node) {
> +		if (carveout->va)
> +			memset(carveout->va, 0, carveout->len);
> +	}
> +
> +	ret = imx_dsp_rproc_elf_load_segments(rproc, fw);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +

This is a much better approach.  During my last review I said that I would not
move forward with this work until Daniel or Iuliana provide their R-B and yet,
they have not been added to the recipient list.

>  static const struct rproc_ops imx_dsp_rproc_ops = {
>  	.prepare	= imx_dsp_rproc_prepare,
>  	.unprepare	= imx_dsp_rproc_unprepare,
>  	.start		= imx_dsp_rproc_start,
>  	.stop		= imx_dsp_rproc_stop,
>  	.kick		= imx_dsp_rproc_kick,
> -	.load		= imx_dsp_rproc_elf_load_segments,
> +	.load		= imx_dsp_rproc_load,
>  	.parse_fw	= imx_dsp_rproc_parse_fw,
>  	.handle_rsc	= imx_dsp_rproc_handle_rsc,
>  	.find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
> @@ -1214,7 +1230,6 @@ static int imx_dsp_runtime_resume(struct device *dev)
>  {
>  	struct rproc *rproc = dev_get_drvdata(dev);
>  	struct imx_dsp_rproc *priv = rproc->priv;
> -	const struct imx_dsp_rproc_dcfg *dsp_dcfg = priv->dsp_dcfg;
>  	int ret;
>  
>  	/*
> @@ -1235,10 +1250,6 @@ static int imx_dsp_runtime_resume(struct device *dev)
>  		return ret;
>  	}
>  
> -	/* Reset DSP if needed */
> -	if (dsp_dcfg->reset)
> -		dsp_dcfg->reset(priv);
> -
>  	return 0;
>  }
>  
> -- 
> 2.34.1
>