linux-kernel - Re: [PATCH v2 3/3] media: atmel-isi: add sanity check for supported formats in set

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Date:	Fri, 21 Aug 2015 11:10:54 +0800
From:	Josh Wu <josh.wu@...el.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.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 v2 3/3] media: atmel-isi: add sanity check for supported
 formats in set_fmt()

Hi, Laurent

Thanks for the review.

On 8/21/2015 2:30 AM, Laurent Pinchart wrote:
> Hi Josh,
>
> Thank you for the patch.
>
> On Wednesday 05 August 2015 11:26:29 Josh Wu wrote:
>> After adding the format check in 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 v2:
>> - new added patch
>>
>>   drivers/media/platform/soc_camera/atmel-isi.c | 39 ++++++++++++++++++------
>>   1 file changed, 31 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/media/platform/soc_camera/atmel-isi.c
>> b/drivers/media/platform/soc_camera/atmel-isi.c index cb46aec..d0df518
>> 100644
>> --- a/drivers/media/platform/soc_camera/atmel-isi.c
>> +++ b/drivers/media/platform/soc_camera/atmel-isi.c
>> @@ -103,17 +103,19 @@ 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;
>> @@ -127,8 +129,6 @@ 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);
>> @@ -139,8 +139,29 @@ 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 struct soc_camera_format_xlate *xlate)
>> +{
>> +	bool ret = true;
>> +
>> +	switch (xlate->code) {
>> +	/* YUV, including grey */
>> +	case MEDIA_BUS_FMT_Y8_1X8:
>> +	case MEDIA_BUS_FMT_VYUY8_2X8:
>> +	case MEDIA_BUS_FMT_UYVY8_2X8:
>> +	case MEDIA_BUS_FMT_YVYU8_2X8:
>> +	case MEDIA_BUS_FMT_YUYV8_2X8:
> I would just return true here and false below, and remove the ret variable.
Ok.

>
>> +		break;
>> +	/* RGB, TODO */
>> +	default:
>> +		dev_err(icd->parent, "not supported format: %d\n",
>> +					xlate->code);
> If this can happen when userspace asks for an unsupported format I don't think
> you should print an error message to the kernel log.

ok, I will remove this.

>
>> +		ret = false;
>> +	}
>> +
>> +	return ret;
>>   }
>>
>>   static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
>> @@ -391,10 +412,8 @@ 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 */
>> @@ -515,6 +534,10 @@ static int isi_camera_set_fmt(struct soc_camera_device
>> *icd, if (mf->code != xlate->code)
>>   		return -EINVAL;
>>
>> +	/* check with atmel-isi support format */
>> +	if (!is_supported(icd, xlate))
>> +		return -EINVAL;
>> +
> S_FMT is supposed to pick a suitable default format when the requested format
> isn't supported. It shouldn't return an error.

So I will move this check to beginning of S_FMT and if format not 
support, I will select a default format for it.

Best Regards,
Josh Wu

>
>>   	pix->width		= mf->width;
>>   	pix->height		= mf->height;
>>   	pix->field		= mf->field;

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