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Date:   Mon, 17 Jul 2023 11:34:35 -0600
From:   Mathieu Poirier <mathieu.poirier@linaro.org>
To:     "Iuliana Prodan (OSS)" <iuliana.prodan@oss.nxp.com>
Cc:     Bjorn Andersson <andersson@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        "S.J. Wang" <shengjiu.wang@nxp.com>,
        Fabio Estevam <festevam@gmail.com>,
        Daniel Baluta <daniel.baluta@nxp.com>,
        Mpuaudiosw <Mpuaudiosw@nxp.com>,
        Iuliana Prodan <iuliana.prodan@nxp.com>,
        linux-imx <linux-imx@nxp.com>, linux-remoteproc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        LnxRevLi <LnxRevLi@nxp.com>
Subject: Re: [PATCH 2/2] remoteproc: imx_dsp_rproc: add module parameter to
 ignore ready flag from remote processor
Message-ID: <ZLV7q9ipDaw4b1Hi@p14s>
References: <20230712224251.26482-1-iuliana.prodan@oss.nxp.com>
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Hi Iuliana,

On Thu, Jul 13, 2023 at 01:42:51AM +0300, Iuliana Prodan (OSS) wrote:
> From: Iuliana Prodan <iuliana.prodan@nxp.com>
> 
> There are cases when we want to test samples that do not
> reply with FW READY message, after fw is loaded and the
> remote processor started.

This seems like a bug to me - where is this FW comes from?

> In these cases, do not wait for a confirmation from the remote processor
> at start.
> 
> Added "ignore_dsp_ready" flag while inserting the module to ignore
> remote processor reply after start.
> By default, this is off - do not ignore reply from rproc.
> 
> Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
> 
> ---
> This was discovered while testing openamp_rsc_table sample from Zephyr
> repo (https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/subsys/ipc/openamp_rsc_table).
> 
> We have IPC, but the remote proc doesn't send a FW_READY reply.
> ---
>  drivers/remoteproc/imx_dsp_rproc.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
> index b5634507d953..ed89de2f3b98 100644
> --- a/drivers/remoteproc/imx_dsp_rproc.c
> +++ b/drivers/remoteproc/imx_dsp_rproc.c
> @@ -36,7 +36,13 @@ module_param_named(no_mailboxes, no_mailboxes, int, 0644);
>  MODULE_PARM_DESC(no_mailboxes,
>  		 "There is no mailbox between cores, so ignore remote proc reply after start, default is 0 (off).");
>  
> +static unsigned int imx_dsp_rproc_ignore_ready;
> +module_param_named(ignore_dsp_ready, imx_dsp_rproc_ignore_ready, int, 0644);
> +MODULE_PARM_DESC(ignore_dsp_ready,
> +		 "Ignore remote proc reply after start, default is 0 (off).");
> +
>  #define REMOTE_IS_READY				BIT(0)
> +#define REMOTE_IGNORE_READY_REPLY	BIT(1)
>  #define REMOTE_READY_WAIT_MAX_RETRIES		500
>  
>  /* att flags */
> @@ -296,6 +302,12 @@ static int imx_dsp_rproc_ready(struct rproc *rproc)
>  	if (!priv->rxdb_ch)
>  		return 0;
>  
> +	/*
> +	 * FW_READY reply is optional/ignored, so don't wait for it.
> +	 */
> +	if (priv->flags & REMOTE_IGNORE_READY_REPLY)
> +		return 0;
> +
>  	for (i = 0; i < REMOTE_READY_WAIT_MAX_RETRIES; i++) {
>  		if (priv->flags & REMOTE_IS_READY)
>  			return 0;
> @@ -1119,6 +1131,9 @@ static int imx_dsp_rproc_probe(struct platform_device *pdev)
>  	else
>  		imx_dsp_rproc_mbox_init = imx_dsp_rproc_mbox_alloc;
>  
> +	if (imx_dsp_rproc_ignore_ready)
> +		priv->flags |= REMOTE_IGNORE_READY_REPLY;
> +
>  	dev_set_drvdata(dev, rproc);
>  
>  	INIT_WORK(&priv->rproc_work, imx_dsp_rproc_vq_work);
> -- 
> 2.17.1
>