linux-kernel - Re: [PATCH 2/2] media: atmel-isi: move configure_geometry() to start

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Date:	Sun, 30 Aug 2015 12:16:48 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Josh Wu <josh.wu@...el.com>
cc:	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] media: atmel-isi: move configure_geometry() to
 start_streaming()

Yep, I see the thread and updates to this patch now, please, ignore this 
mail, sorry.

Thanks
Guennadi

On Sun, 30 Aug 2015, Guennadi Liakhovetski wrote:

> Hi Josh,
> 
> On Wed, 17 Jun 2015, Josh Wu wrote:
> 
> > As in set_fmt() function we only need to know which format is been set,
> > we don't need to access the ISI hardware in this moment.
> > 
> > So move the configure_geometry(), which access the ISI hardware, to
> > start_streaming() will make code more consistent and simpler.
> > 
> > Signed-off-by: Josh Wu <josh.wu@...el.com>
> > ---
> > 
> >  drivers/media/platform/soc_camera/atmel-isi.c | 17 +++++------------
> >  1 file changed, 5 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c
> > index 8bc40ca..b01086d 100644
> > --- a/drivers/media/platform/soc_camera/atmel-isi.c
> > +++ b/drivers/media/platform/soc_camera/atmel-isi.c
> > @@ -390,6 +390,11 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
> >  	/* Disable all interrupts */
> >  	isi_writel(isi, ISI_INTDIS, (u32)~0UL);
> >  
> > +	ret = configure_geometry(isi, icd->user_width, icd->user_height,
> > +				icd->current_fmt->code);
> > +	if (ret < 0)
> > +		return ret;
> 
> No. Firstly, you'd have to pm_runtime_put() here if you fail. Secondly I 
> think it's better to fail earlier - at S_FMT, than here. Not accessing the 
> hardware in S_FMT is a good idea, but I'd at least do all the checking 
> there. So, maybe add a "u32 cfg2_cr" field to struct atmel_isi, calculate 
> it in S_FMT but only write to the hardware in start_streaming()?
> 
> Thanks
> Guennadi
> 
> > +
> >  	spin_lock_irq(&isi->lock);
> >  	/* Clear any pending interrupt */
> >  	isi_readl(isi, ISI_STATUS);
> > @@ -477,8 +482,6 @@ static int isi_camera_init_videobuf(struct vb2_queue *q,
> >  static int isi_camera_set_fmt(struct soc_camera_device *icd,
> >  			      struct v4l2_format *f)
> >  {
> > -	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
> > -	struct atmel_isi *isi = ici->priv;
> >  	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
> >  	const struct soc_camera_format_xlate *xlate;
> >  	struct v4l2_pix_format *pix = &f->fmt.pix;
> > @@ -511,16 +514,6 @@ static int isi_camera_set_fmt(struct soc_camera_device *icd,
> >  	if (mf->code != xlate->code)
> >  		return -EINVAL;
> >  
> > -	/* Enable PM and peripheral clock before operate isi registers */
> > -	pm_runtime_get_sync(ici->v4l2_dev.dev);
> > -
> > -	ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
> > -
> > -	pm_runtime_put(ici->v4l2_dev.dev);
> > -
> > -	if (ret < 0)
> > -		return ret;
> > -
> >  	pix->width		= mf->width;
> >  	pix->height		= mf->height;
> >  	pix->field		= mf->field;
> > -- 
> > 1.9.1
> > 
> 
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