linux-kernel - Re: [PATCH v2 03/12] remoteproc: stm32: Decouple rproc from DT parsing

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Message-ID: <20200430205819.GD18004@xps15>
Date:   Thu, 30 Apr 2020 14:58:19 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Arnaud POULIQUEN <arnaud.pouliquen@...com>
Cc:     bjorn.andersson@...aro.org, ohad@...ery.com,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com,
        loic.pallardy@...com, linux-remoteproc@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/12] remoteproc: stm32: Decouple rproc from DT
 parsing

On Wed, Apr 29, 2020 at 03:37:58PM +0200, Arnaud POULIQUEN wrote:
> Hi Mathieu,
> 
> On 4/24/20 10:24 PM, Mathieu Poirier wrote:
> > Remove the remote processor from the process of parsing the device tree
> > since (1) there is no correlation between them and (2) to use the
> > information that was gathered to make a decision on whether to
> > synchronise with the M4 or not.
> > 
> > Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> > ---
> >  drivers/remoteproc/stm32_rproc.c | 25 ++++++++++++++-----------
> >  1 file changed, 14 insertions(+), 11 deletions(-)
> > 
> > diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
> > index 1ac90adba9b1..57a426ea620b 100644
> > --- a/drivers/remoteproc/stm32_rproc.c
> > +++ b/drivers/remoteproc/stm32_rproc.c
> > @@ -538,12 +538,11 @@ static int stm32_rproc_get_syscon(struct device_node *np, const char *prop,
> >  	return err;
> >  }
> >  
> > -static int stm32_rproc_parse_dt(struct platform_device *pdev)
> > +static int stm32_rproc_parse_dt(struct platform_device *pdev,
> > +				struct stm32_rproc *ddata, bool *auto_boot)
> >  {
> >  	struct device *dev = &pdev->dev;
> >  	struct device_node *np = dev->of_node;
> > -	struct rproc *rproc = platform_get_drvdata(pdev);
> > -	struct stm32_rproc *ddata = rproc->priv;
> >  	struct stm32_syscon tz;
> >  	unsigned int tzen;
> >  	int err, irq;
> > @@ -589,7 +588,7 @@ static int stm32_rproc_parse_dt(struct platform_device *pdev)
> >  
> >  	err = regmap_read(tz.map, tz.reg, &tzen);
> >  	if (err) {
> > -		dev_err(&rproc->dev, "failed to read tzen\n");
> > +		dev_err(dev, "failed to read tzen\n");
> >  		return err;
> >  	}
> >  	ddata->secured_soc = tzen & tz.mask;
> > @@ -605,7 +604,7 @@ static int stm32_rproc_parse_dt(struct platform_device *pdev)
> >  	if (err)
> >  		dev_info(dev, "failed to get pdds\n");
> >  
> > -	rproc->auto_boot = of_property_read_bool(np, "st,auto-boot");
> > +	*auto_boot = of_property_read_bool(np, "st,auto-boot");
> >  
> >  	return stm32_rproc_of_memory_translations(pdev, ddata);
> >  }
> > @@ -616,6 +615,7 @@ static int stm32_rproc_probe(struct platform_device *pdev)
> >  	struct stm32_rproc *ddata;
> >  	struct device_node *np = dev->of_node;
> >  	struct rproc *rproc;
> > +	bool auto_boot = false;
> 
> Nitpicking: Seems that you don't need to initialize it. 

I think you are correct.

> Perhaps you can simply suppress the local variable and directly use rproc->auto_boot.

... and change the value of rproc->auto_boot if state == M4_STATE_CRUN?  Sure,
that's possible.

Thanks for all the comments, it really helps to have a different perspective.  I
am out of time for today but will continue with the rest of your comments
tomorrow.

Mathieu

> 
> else LGTM
> 
> 
> Thanks,
> Arnaud
> 
> >  	int ret;
> >  
> >  	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
> > @@ -626,9 +626,16 @@ static int stm32_rproc_probe(struct platform_device *pdev)
> >  	if (!rproc)
> >  		return -ENOMEM;
> >  
> > +	ddata = rproc->priv;
> > +
> >  	rproc_coredump_set_elf_info(rproc, ELFCLASS32, EM_NONE);
> > +
> > +	ret = stm32_rproc_parse_dt(pdev, ddata, &auto_boot);
> > +	if (ret)
> > +		goto free_rproc;
> > +
> > +	rproc->auto_boot = auto_boot;
> >  	rproc->has_iommu = false;
> > -	ddata = rproc->priv;
> >  	ddata->workqueue = create_workqueue(dev_name(dev));
> >  	if (!ddata->workqueue) {
> >  		dev_err(dev, "cannot create workqueue\n");
> > @@ -638,13 +645,9 @@ static int stm32_rproc_probe(struct platform_device *pdev)
> >  
> >  	platform_set_drvdata(pdev, rproc);
> >  
> > -	ret = stm32_rproc_parse_dt(pdev);
> > -	if (ret)
> > -		goto free_wkq;
> > -
> >  	ret = stm32_rproc_request_mbox(rproc);
> >  	if (ret)
> > -		goto free_rproc;
> > +		goto free_wkq;
> >  
> >  	ret = rproc_add(rproc);
> >  	if (ret)
> >