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Date:   Wed, 19 Aug 2020 00:51:27 +0000
From:   Peng Fan <peng.fan@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "o.rempel@...gutronix.de" <o.rempel@...gutronix.de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH 04/10] remoteproc: imx_rproc: make syscon optional

> Subject: Re: [PATCH 04/10] remoteproc: imx_rproc: make syscon optional
> 
> Hi Peng,
> 
> On Fri, Jul 24, 2020 at 04:08:07PM +0800, Peng Fan wrote:
> > Make syscon optional, since i.MX8QM/QXP/7ULP not have SRC to control
> M4.
> > But currently i.MX8QM/QXP/7ULP not added, so still check regmap when
> > start/stop to avoid unhappy things.
> 
> On the i.MX8QM/QXP/7ULP processors, the remote processors are not
> handled by the remoteproc cores, as implemented in this patch.  In such a
> scenario how does the remoteproc core know the remote processor has
> crashed and how does it recover from such a condition?

For 7ULP dual boot case, A7 is under control of M4, so if m4 crash, I suppose
A7 would not work properly.

For 8QM/QXP partition case, M4 is in a standalone partition, if M4 crash or
reboot, the system controller unit will restart M4 and notify Acore that M4
restart.

Thanks,
Peng.

> 
> Thanks,
> Mathieu
> 
> >
> > Reviewed-by: Richard Zhu <hongxing.zhu@....com>
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  drivers/remoteproc/imx_rproc.c | 11 +++++++++--
> >  1 file changed, 9 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/remoteproc/imx_rproc.c
> > b/drivers/remoteproc/imx_rproc.c index 82594a800a1b..4fad5c0b1c05
> > 100644
> > --- a/drivers/remoteproc/imx_rproc.c
> > +++ b/drivers/remoteproc/imx_rproc.c
> > @@ -162,6 +162,9 @@ static int imx_rproc_start(struct rproc *rproc)
> >  	struct device *dev = priv->dev;
> >  	int ret;
> >
> > +	if (!priv->regmap)
> > +		return -EOPNOTSUPP;
> > +
> >  	ret = regmap_update_bits(priv->regmap, dcfg->src_reg,
> >  				 dcfg->src_mask, dcfg->src_start);
> >  	if (ret)
> > @@ -177,6 +180,9 @@ static int imx_rproc_stop(struct rproc *rproc)
> >  	struct device *dev = priv->dev;
> >  	int ret;
> >
> > +	if (!priv->regmap)
> > +		return -EOPNOTSUPP;
> > +
> >  	ret = regmap_update_bits(priv->regmap, dcfg->src_reg,
> >  				 dcfg->src_mask, dcfg->src_stop);
> >  	if (ret)
> > @@ -325,9 +331,10 @@ static int imx_rproc_probe(struct platform_device
> *pdev)
> >  	regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
> >  	if (IS_ERR(regmap)) {
> >  		dev_err(dev, "failed to find syscon\n");
> > -		return PTR_ERR(regmap);
> > +		regmap = NULL;
> > +	} else {
> > +		regmap_attach_dev(dev, regmap, &config);
> >  	}
> > -	regmap_attach_dev(dev, regmap, &config);
> >
> >  	/* set some other name then imx */
> >  	rproc = rproc_alloc(dev, "imx-rproc", &imx_rproc_ops,
> > --
> > 2.16.4
> >

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