linux-kernel - Re: [PATCH V3 7/8] remoteproc: imx

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Date:   Tue, 13 Apr 2021 11:49:32 -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 7/8] remoteproc: imx_rproc: support i.MX7ULP

On Thu, Apr 08, 2021 at 09:54:57AM +0800, peng.fan@....nxp.com wrote:
> From: Peng Fan <peng.fan@....com>
> 
> i.MX7ULP A7 core runs under control of M4 core, M4 core starts by ROM
> and powers most serivces used by A7 core, so A7 core has no power to
> start and stop M4 core.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/remoteproc/imx_rproc.c | 25 ++++++++++++++++++++++---
>  1 file changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index a7fa9d7fc2d1..b911a7539897 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -147,6 +147,14 @@ static const struct imx_rproc_att imx_rproc_att_imx8mq[] = {
>  	{ 0x40000000, 0x40000000, 0x80000000, 0 },
>  };
>  
> +static const struct imx_rproc_att imx_rproc_att_imx7ulp[] = {
> +	{0x1FFD0000, 0x1FFD0000, 0x30000, ATT_OWN},
> +	{0x20000000, 0x20000000, 0x10000, ATT_OWN},
> +	{0x2F000000, 0x2F000000, 0x20000, ATT_OWN},
> +	{0x2F020000, 0x2F020000, 0x20000, ATT_OWN},
> +	{0x60000000, 0x60000000, 0x40000000, 0}
> +};
> +
>  static const struct imx_rproc_att imx_rproc_att_imx7d[] = {
>  	/* dev addr , sys addr  , size	    , flags */
>  	/* OCRAM_S (M4 Boot code) - alias */
> @@ -207,6 +215,12 @@ static const struct imx_rproc_dcfg imx_rproc_cfg_imx8mq = {
>  	.method		= IMX_RPROC_MMIO,
>  };
>  
> +static const struct imx_rproc_dcfg imx_rproc_cfg_imx7ulp = {
> +	.att		= imx_rproc_att_imx7ulp,
> +	.att_size	= ARRAY_SIZE(imx_rproc_att_imx7ulp),
> +	.method		= IMX_RPROC_NONE,
> +};
> +
>  static const struct imx_rproc_dcfg imx_rproc_cfg_imx7d = {
>  	.src_reg	= IMX7D_SRC_SCR,
>  	.src_mask	= IMX7D_M4_RST_MASK,
> @@ -598,12 +612,16 @@ static int imx_rproc_detect_mode(struct imx_rproc *priv)
>  			return ret;
>  		}
>  
> -		if (!(val & dcfg->src_stop)) {
> -			priv->rproc->state = RPROC_DETACHED;
> +		if (!(val & dcfg->src_stop))
>  			priv->mode = IMX_RPROC_EARLY_BOOT;
> -		}
>  	}
>  
> +	if (dcfg->method == IMX_RPROC_NONE)
> +		priv->mode = IMX_RPROC_EARLY_BOOT;

As I pointed out there is no need for priv->mode.  Just declare a boolean
variable that is local to this function and use it to determine the state of the
remote processor:

        if (dcfg->method == IMX_RPROC_NONE)
                early_boot = true;

        if (early_boot)
                priv->rproc->state = RPROC_DETACHED;

> +
> +	if (priv->mode == IMX_RPROC_EARLY_BOOT)
> +		priv->rproc->state = RPROC_DETACHED;
> +
>  	return 0;
>  }
>  
> @@ -724,6 +742,7 @@ static int imx_rproc_remove(struct platform_device *pdev)
>  }
>  
>  static const struct of_device_id imx_rproc_of_match[] = {
> +	{ .compatible = "fsl,imx7ulp-cm4", .data = &imx_rproc_cfg_imx7ulp },
>  	{ .compatible = "fsl,imx7d-cm4", .data = &imx_rproc_cfg_imx7d },
>  	{ .compatible = "fsl,imx6sx-cm4", .data = &imx_rproc_cfg_imx6sx },
>  	{ .compatible = "fsl,imx8mq-cm4", .data = &imx_rproc_cfg_imx8mq },
> -- 
> 2.30.0
>