linux-kernel - Re: [PATCH v3 3/3] media: atmel-isi: add sanity check for supported formats in try/set

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Date:	Fri, 21 Aug 2015 21:22:43 +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 v3 3/3] media: atmel-isi: add sanity check for supported formats in try/set_fmt()

Hi Josh,

Thank you for the patch.

On Friday 21 August 2015 16:08:14 Josh Wu wrote:
> After adding the format check in try_fmt()/set_fmt(), we don't need any
> format check in configure_geometry(). So make configure_geometry() as
> void type.
> 
> Signed-off-by: Josh Wu <josh.wu@...el.com>
> ---
> 
> Changes in v3:
> - check the whether format is supported, if no then return a default
>   format.
> - misc changes according to Laurent's feedback.
> 
> Changes in v2:
> - new added patch
> 
>  drivers/media/platform/soc_camera/atmel-isi.c | 37 ++++++++++++++++++------
>  1 file changed, 29 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/media/platform/soc_camera/atmel-isi.c
> b/drivers/media/platform/soc_camera/atmel-isi.c index fe9247a..84c91d3
> 100644
> --- a/drivers/media/platform/soc_camera/atmel-isi.c
> +++ b/drivers/media/platform/soc_camera/atmel-isi.c
> @@ -102,17 +102,19 @@ static u32 isi_readl(struct atmel_isi *isi, u32 reg)
>  	return readl(isi->regs + reg);
>  }
> 
> -static int configure_geometry(struct atmel_isi *isi, u32 width,
> +static void configure_geometry(struct atmel_isi *isi, u32 width,
>  			u32 height, u32 code)
>  {
>  	u32 cfg2;
> 
>  	/* According to sensor's output format to set cfg2 */
>  	switch (code) {
> -	/* YUV, including grey */
> +	default:
> +	/* Grey */
>  	case MEDIA_BUS_FMT_Y8_1X8:
>  		cfg2 = ISI_CFG2_GRAYSCALE;
>  		break;
> +	/* YUV */
>  	case MEDIA_BUS_FMT_VYUY8_2X8:
>  		cfg2 = ISI_CFG2_YCC_SWAP_MODE_3;
>  		break;
> @@ -126,8 +128,6 @@ static int configure_geometry(struct atmel_isi *isi, u32
> width, cfg2 = ISI_CFG2_YCC_SWAP_DEFAULT;
>  		break;
>  	/* RGB, TODO */
> -	default:
> -		return -EINVAL;
>  	}
> 
>  	isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
> @@ -138,8 +138,23 @@ static int configure_geometry(struct atmel_isi *isi,
> u32 width, cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
>  			& ISI_CFG2_IM_VSIZE_MASK;
>  	isi_writel(isi, ISI_CFG2, cfg2);
> +}
> 
> -	return 0;
> +static bool is_supported(struct soc_camera_device *icd,
> +		const u32 pixformat)
> +{
> +	switch (pixformat) {
> +	/* YUV, including grey */
> +	case V4L2_PIX_FMT_GREY:
> +	case V4L2_PIX_FMT_YUYV:
> +	case V4L2_PIX_FMT_UYVY:
> +	case V4L2_PIX_FMT_YVYU:
> +	case V4L2_PIX_FMT_VYUY:
> +		return true;
> +	/* RGB, TODO */
> +	default:
> +		return false;
> +	}
>  }
> 
>  static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
> @@ -390,10 +405,8 @@ 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,
> +	configure_geometry(isi, icd->user_width, icd->user_height,
>  				icd->current_fmt->code);
> -	if (ret < 0)
> -		return ret;
> 
>  	spin_lock_irq(&isi->lock);
>  	/* Clear any pending interrupt */
> @@ -491,6 +504,10 @@ static int isi_camera_set_fmt(struct soc_camera_device
> *icd, struct v4l2_mbus_framefmt *mf = &format.format;
>  	int ret;
> 
> +	/* check with atmel-isi support format, if not support use UYVY */
> +	if (!is_supported(icd, pix->pixelformat))
> +		pix->pixelformat = V4L2_PIX_FMT_YUYV;

The comment mentions UYVY and the code uses YUYV.

> +
>  	xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
>  	if (!xlate) {
>  		dev_warn(icd->parent, "Format %x not found\n",

Can this still happen ?

> @@ -540,6 +557,10 @@ static int isi_camera_try_fmt(struct soc_camera_device
> *icd, u32 pixfmt = pix->pixelformat;
>  	int ret;
> 
> +	/* check with atmel-isi support format, if not support use UYVY */
> +	if (!is_supported(icd, pix->pixelformat))
> +		pix->pixelformat = V4L2_PIX_FMT_YUYV;
> +
>  	xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
>  	if (pixfmt && !xlate) {
>  		dev_warn(icd->parent, "Format %x not found\n", pixfmt);

Same comment here.

I wonder whether most of the content of isi_camera_set_fmt() and 
isi_camera_try_fmt() could be factorized out into a shared function.

-- 
Regards,

Laurent Pinchart

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