Re: [PATCH 40/40] media: imx: set and propagate empty field, colorimetry params

[Philipp Zabel]

Hi Steve,

On Wed, 2017-04-12 at 17:45 -0700, Steve Longerbeam wrote:
> This patch adds a call to imx_media_fill_empty_mbus_fields() in the
> *_try_fmt() functions at the sink pads, to set empty field order and
> colorimetry parameters.
> 
> If the field order is set to ANY, choose the currently set field order
> at the sink pad. If the colorspace is set to DEFAULT, choose the
> current colorspace at the sink pad.  If any of xfer_func, ycbcr_enc
> or quantization are set to DEFAULT, either choose the current sink pad
> setting, or the default setting for the new colorspace, if non-DEFAULT
> colorspace was given.
> 
> Colorimetry is also propagated from sink to source pads anywhere
> this has not already been done. The exception is ic-prpencvf at the
> source pad, since the Image Converter outputs fixed quantization and
> Y`CbCr encoding.
> 
> Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx>
> ---
>  drivers/staging/media/imx/imx-ic-prp.c      |  5 ++-
>  drivers/staging/media/imx/imx-ic-prpencvf.c | 25 +++++++++++---
>  drivers/staging/media/imx/imx-media-csi.c   | 12 +++++--
>  drivers/staging/media/imx/imx-media-utils.c | 53 +++++++++++++++++++++++++++++
>  drivers/staging/media/imx/imx-media-vdic.c  |  7 ++--
>  drivers/staging/media/imx/imx-media.h       |  3 +-
>  6 files changed, 95 insertions(+), 10 deletions(-)
> 
[...]
> diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
> index 7b2f92d..b07d0ae 100644
> --- a/drivers/staging/media/imx/imx-media-utils.c
> +++ b/drivers/staging/media/imx/imx-media-utils.c
> @@ -464,6 +464,59 @@ int imx_media_init_mbus_fmt(struct v4l2_mbus_framefmt *mbus,
>  }
>  EXPORT_SYMBOL_GPL(imx_media_init_mbus_fmt);
>  
> +/*
> + * Check whether the field or colorimetry params in tryfmt are
> + * uninitialized, and if so fill them with the values from fmt.
> + * The exception is when tryfmt->colorspace has been initialized,
> + * if so all the further default colorimetry params can be derived
> + * from tryfmt->colorspace.
> + */
> +void imx_media_fill_empty_mbus_fields(struct v4l2_mbus_framefmt *tryfmt,
> +				      struct v4l2_mbus_framefmt *fmt)
> +{
> +	/* fill field if necessary */
> +	if (tryfmt->field == V4L2_FIELD_ANY)
> +		tryfmt->field = fmt->field;
> +
> +	/* fill colorimetry if necessary */
> +	if (tryfmt->colorspace == V4L2_COLORSPACE_DEFAULT) {
> +		tryfmt->colorspace = fmt->colorspace;
> +		if (tryfmt->xfer_func == V4L2_XFER_FUNC_DEFAULT)
> +			tryfmt->xfer_func = fmt->xfer_func;
> +		if (tryfmt->ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT)
> +			tryfmt->ycbcr_enc = fmt->ycbcr_enc;
> +		if (tryfmt->quantization == V4L2_QUANTIZATION_DEFAULT)
> +			tryfmt->quantization = fmt->quantization;

According to Hans' latest comments, this could be changed to:

----------8<----------