linux-kernel - Re: [PATCH V3 5/8] remoteproc: imx

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Message-ID: <20210413173113.GC750651@xps15>
Date:   Tue, 13 Apr 2021 11:31:13 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     peng.fan@....nxp.com
Cc:     ohad@...ery.com, bjorn.andersson@...aro.org,
        o.rempel@...gutronix.de, robh+dt@...nel.org,
        devicetree@...r.kernel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V3 5/8] remoteproc: imx_rproc: parse fsl,auto-boot

On Thu, Apr 08, 2021 at 09:54:55AM +0800, peng.fan@....nxp.com wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Parse fsl,auto-boot to indicate whether need remoteproc framework
> auto boot or not.
> 
> When remote processor is booted before Linux Kernel up, do not parse
> fsl,auto-boot. So add an entry to store the working mode of remote
> processor. Currently only IMX_RPROC_NORMAL, IMX_RPROC_EARLY_BOOT.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/remoteproc/imx_rproc.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index ca17f520d904..c576e12d3817 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -83,6 +83,16 @@ struct imx_rproc_dcfg {
>  	size_t				att_size;
>  };
>  
> +enum imx_rproc_mode {
> +	/* Linux load/kick remote core */
> +	IMX_RPROC_NORMAL,
> +	/*
> +	 * remote core booted before kicking Linux, and remote core
> +	 * could be stopped & restarted by Linux
> +	 */
> +	IMX_RPROC_EARLY_BOOT,
> +};
> +

As far as I can see a new mode to track the state of the remote processor is not
needed.  rproc->state can do that for you.

>  struct imx_rproc {
>  	struct device			*dev;
>  	struct regmap			*regmap;
> @@ -96,6 +106,7 @@ struct imx_rproc {
>  	struct work_struct		rproc_work;
>  	struct workqueue_struct		*workqueue;
>  	void __iomem			*rsc_table;
> +	enum imx_rproc_mode		mode;
>  };
>  
>  static const struct imx_rproc_att imx_rproc_att_imx8mq[] = {
> @@ -565,14 +576,18 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
>  	int ret;
>  	u32 val;
>  
> +	priv->mode = IMX_RPROC_NORMAL;
> +
>  	ret = regmap_read(priv->regmap, dcfg->src_reg, &val);
>  	if (ret) {
>  		dev_err(dev, "Failed to read src\n");
>  		return ret;
>  	}
>  
> -	if (!(val & dcfg->src_stop))
> +	if (!(val & dcfg->src_stop)) {
> +		priv->mode = IMX_RPROC_EARLY_BOOT;
>  		priv->rproc->state = RPROC_DETACHED;
> +	}
>  
>  	return 0;
>  }
> @@ -654,6 +669,9 @@ static int imx_rproc_probe(struct platform_device *pdev)
>  
>  	INIT_WORK(&priv->rproc_work, imx_rproc_vq_work);
>  
> +	if (priv->mode == IMX_RPROC_NORMAL)
> +		rproc->auto_boot = of_property_read_bool(np, "fsl,auto-boot");
> +

        if (rproc->state == RPROC_DETACHED)

>  	ret = rproc_add(rproc);
>  	if (ret) {
>  		dev_err(dev, "rproc_add failed\n");
> -- 
> 2.30.0
>