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

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Date:	Fri, 31 Jul 2015 17:37:52 +0300
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Josh Wu <josh.wu@...el.com>
Cc:	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	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()

Hi Josh,

Thank you for the patch.

On Wednesday 17 June 2015 18:39:39 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);

I would also make configure_geometry a void function, as the only failure case 
really can't occur.

Apart from that,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> +	if (ret < 0)
> +		return ret;
> +
>  	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;

-- 
Regards,

Laurent Pinchart

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