Re: [PATCH 2/7] v4l2: replace video op g_mbus_fmt by pad op get_fmt

[Hans Verkuil <hverkuil@xs4all.nl>]

On 06/15/2015 12:08 AM, Laurent Pinchart wrote:
> Hi Hans,
> 
> (CC'ing Javier Martin)
> 
> On Thursday 09 April 2015 12:21:23 Hans Verkuil wrote:
>> From: Hans Verkuil <hans.verkuil@cisco.com>
>>
>> The g_mbus_fmt video op is a duplicate of the pad op. Replace all uses
>> by the get_fmt pad op and remove the video op.
>>
>> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
>> Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
>> Cc: Prabhakar Lad <prabhakar.csengg@gmail.com>
>> Cc: Kamil Debski <k.debski@samsung.com>
> 
> [snip]
> 
>> diff --git a/drivers/media/i2c/tvp5150.c b/drivers/media/i2c/tvp5150.c
>> index f2f87b7..e4fa074 100644
>> --- a/drivers/media/i2c/tvp5150.c
>> +++ b/drivers/media/i2c/tvp5150.c
>> @@ -828,14 +828,18 @@ static int tvp5150_enum_mbus_code(struct v4l2_subdev
>> *sd, return 0;
>>  }
>>
>> -static int tvp5150_mbus_fmt(struct v4l2_subdev *sd,
>> -			    struct v4l2_mbus_framefmt *f)
>> +static int tvp5150_fill_fmt(struct v4l2_subdev *sd,
>> +		struct v4l2_subdev_pad_config *cfg,
>> +		struct v4l2_subdev_format *format)
>>  {
>> +	struct v4l2_mbus_framefmt *f;
>>  	struct tvp5150 *decoder = to_tvp5150(sd);
>>
>> -	if (f == NULL)
>> +	if (!format || format->pad)
>>  		return -EINVAL;
>>
>> +	f = &format->format;
>> +
>>  	tvp5150_reset(sd, 0);
> 
> This resets the device every time a get or set format is issued, even for TRY 
> formats. I don't think that's right.
> 
> Do you have any idea why this is needed ? The code was introduced in commit 
> ec2c4f3f93cb ("[media] media: tvp5150: Add mbus_fmt callbacks"), with Javier 
> listed as the author but Mauro being the only SoB.

I have no idea why this would be needed. I agree with you that it seems
unnecessary. Note that I don't think this is ever used with TRY formats today,
but still it doesn't look right for SET formats either.

Regards,

	Hans

> 
>>  	f->width = decoder->rect.width;
>> @@ -1069,9 +1073,6 @@ static const struct v4l2_subdev_tuner_ops
>> tvp5150_tuner_ops = { static const struct v4l2_subdev_video_ops
>> tvp5150_video_ops = {
>>  	.s_std = tvp5150_s_std,
>>  	.s_routing = tvp5150_s_routing,
>> -	.s_mbus_fmt = tvp5150_mbus_fmt,
>> -	.try_mbus_fmt = tvp5150_mbus_fmt,
>> -	.g_mbus_fmt = tvp5150_mbus_fmt,
>>  	.s_crop = tvp5150_s_crop,
>>  	.g_crop = tvp5150_g_crop,
>>  	.cropcap = tvp5150_cropcap,
>> @@ -1086,6 +1087,8 @@ static const struct v4l2_subdev_vbi_ops
>> tvp5150_vbi_ops = {
>>
>>  static const struct v4l2_subdev_pad_ops tvp5150_pad_ops = {
>>  	.enum_mbus_code = tvp5150_enum_mbus_code,
>> +	.set_fmt = tvp5150_fill_fmt,
>> +	.get_fmt = tvp5150_fill_fmt,
>>  };
>>
>>  static const struct v4l2_subdev_ops tvp5150_ops = {
>