Re: [PATCH 17/20] media: adv7604: Support V4L_FIELD_INTERLACED

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On 05/20/2015 06:39 PM, William Towle wrote:
> When hardware reports interlaced input, correctly set field to
> V4L_FIELD_INTERLACED ini adv76xx_fill_format.
> 
> Signed-off-by: Rob Taylor <rob.taylor@xxxxxxxxxxxxxxx>
> Reviewed-by: William Towle <william.towle@xxxxxxxxxxxxxxx>
> ---
>  drivers/media/i2c/adv7604.c |    7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
> index 4bde3e1..d77ee1f 100644
> --- a/drivers/media/i2c/adv7604.c
> +++ b/drivers/media/i2c/adv7604.c
> @@ -1791,7 +1791,12 @@ static void adv76xx_fill_format(struct adv76xx_state *state,
>  
>  	format->width = state->timings.bt.width;
>  	format->height = state->timings.bt.height;
> -	format->field = V4L2_FIELD_NONE;
> +
> +	if (state->timings.bt.interlaced)
> +		format->field= V4L2_FIELD_INTERLACED;

No, this should be FIELD_ALTERNATE. FIELD_INTERLACED means that the two fields
are interlaced into a single frame buffer, with FIELD_ALTERNATE each buffer
contains one field. And when capturing v4l2_buffer should return which field
(TOP/BOTTOM) the buffer contains. It also complicates cropping/composing: the
crop rectangle is in frame coordinates, composing uses field coordinates.
The vivid driver handles this correctly and can be used as a reference.

Also, no space before the '='. Please add.

You might be interested in this patch series as well:

http://permalink.gmane.org/gmane.linux.drivers.video-input-infrastructure/90578

I'm thinking of doing some interlaced tests myself, possibly this weekend,
using the adv7604.

Regards,

	Hans

> +	else
> +		format->field= V4L2_FIELD_NONE;
> +
>  	format->colorspace = V4L2_COLORSPACE_SRGB;
>  
>  	if (state->timings.bt.flags & V4L2_DV_FL_IS_CE_VIDEO)
> 

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