Re: [PATCH 2/2] remoteproc: imx_dsp_rproc: add module parameter to ignore ready flag from remote processor

[Iuliana Prodan]

Hi Mathieu,

On 7/17/2023 8:34 PM, Mathieu Poirier wrote:
> Hi Iuliana,
>
> On Thu, Jul 13, 2023 at 01:42:51AM +0300, Iuliana Prodan (OSS) wrote:
> > From: Iuliana Prodan <iuliana.prodan@xxxxxxx>
> >
> > 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?
The firmware is a generic sample from Zephyr repo: 
https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/subsys/ipc/openamp_rsc_table

There is no bug, this is how the application was written.

Rather than modifying a generic sample for i.MX usecase, I prefer doing 
an "insmod imx_dsp_rproc.ko ignore_dsp_ready=1" just for this sample.

Thanks,
Iulia

> > 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@xxxxxxx>
> >
> > ---
> > This was discovered while testing openamp_rsc_table sample from Zephyr
> > repo (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fzephyrproject-rtos%2Fzephyr%2Ftree%2Fmain%2Fsamples%2Fsubsys%2Fipc%2Fopenamp_rsc_table&data=05%7C01%7Ciuliana.prodan%40nxp.com%7C4779cb20393e4af08a9408db86ec191e%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C638252120814415013%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=iCjvv8wr3sQ4CEXFcXDsW0VSw5RXr1ASw7LN2J08SXE%3D&reserved=0).
> >
> > 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