On 04/06/2017 03:55 PM, Philipp Zabel wrote:
> If the the field order is set to ANY in set_fmt, choose the currently
> set field order. If the colorspace is set to DEFAULT, choose the current
> colorspace. If any of xfer_func, ycbcr_enc or quantization are set to
> DEFAULT, either choose the current setting, or the default setting for the
> new colorspace, if non-DEFAULT colorspace was given.
>
> This allows to let field order and colorimetry settings be propagated
> from upstream by calling media-ctl on the upstream entity source pad,
> and then call media-ctl on the sink pad to manually set the input frame
> interval, without changing the already set field order and colorimetry
> information.
>
> Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> ---
> This is based on imx-media-staging-md-v14, and it is supposed to allow
> configuring the pipeline with media-ctl like this:
>
> 1) media-ctl --set-v4l2 "'tc358743 1-000f':0[fmt:UYVY8_1X16/1920x1080]"
> 2) media-ctl --set-v4l2 "'imx6-mipi-csi2':1[fmt:UYVY8_1X16/1920x108]"
> 3) media-ctl --set-v4l2 "'ipu1_csi0_mux':2[fmt:UYVY8_1X16/1920x1080]"
> 4) media-ctl --set-v4l2 "'ipu1_csi0':0[fmt:UYVY8_1X16/1920x1080@1/60]"
> 5) media-ctl --set-v4l2 "'ipu1_csi0':2[fmt:AYUV32/1920x1080@1/30]"
>
> Without having step 4) overwrite the colorspace and field order set on
> 'ipu1_csi0':0 by the propagation in step 3).
> ---
> drivers/staging/media/imx/imx-media-csi.c | 34 +++++++++++++++++++++++++++++++
> 1 file changed, 34 insertions(+)
>
> diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
> index 64dc454f6b371..d94ce1de2bf05 100644
> --- a/drivers/staging/media/imx/imx-media-csi.c
> +++ b/drivers/staging/media/imx/imx-media-csi.c
> @@ -1325,6 +1325,40 @@ static int csi_set_fmt(struct v4l2_subdev *sd,
> csi_try_fmt(priv, sensor, cfg, sdformat, crop, compose, &cc);
>
> fmt = __csi_get_fmt(priv, cfg, sdformat->pad, sdformat->which);
> +
> + /* Retain current field setting as default */
> + if (sdformat->format.field == V4L2_FIELD_ANY)
> + sdformat->format.field = fmt->field;
sdformat->format.field should never be FIELD_ANY. If it is, then that's a
subdev bug and I'm pretty sure FIELD_NONE was intended.
> +
> + /* Retain current colorspace setting as default */
> + if (sdformat->format.colorspace == V4L2_COLORSPACE_DEFAULT) {
> + sdformat->format.colorspace = fmt->colorspace;
No! Subdevs should never return COLORSPACE_DEFAULT. If they do, then fix
them. If this happens a lot (I'm not sure how reliably subdevs fill this
in) you could set it to COLORSPACE_RAW. Perhaps with a WARN_ON_ONCE.
> + if (sdformat->format.xfer_func == V4L2_XFER_FUNC_DEFAULT)
> + sdformat->format.xfer_func = fmt->xfer_func;
> + if (sdformat->format.ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT)
> + sdformat->format.ycbcr_enc = fmt->ycbcr_enc;
> + if (sdformat->format.quantization == V4L2_QUANTIZATION_DEFAULT)
> + sdformat->format.quantization = fmt->quantization;
Nack. This is meaningless.
> + } else {
> + if (sdformat->format.xfer_func == V4L2_XFER_FUNC_DEFAULT) {
> + sdformat->format.xfer_func =
> + V4L2_MAP_XFER_FUNC_DEFAULT(
> + sdformat->format.colorspace);
> + }
> + if (sdformat->format.ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT) {
> + sdformat->format.ycbcr_enc =
> + V4L2_MAP_YCBCR_ENC_DEFAULT(
> + sdformat->format.colorspace);
> + }
> + if (sdformat->format.quantization == V4L2_QUANTIZATION_DEFAULT) {
> + sdformat->format.quantization =
> + V4L2_MAP_QUANTIZATION_DEFAULT(
> + cc->cs != IPUV3_COLORSPACE_YUV,
> + sdformat->format.colorspace,
> + sdformat->format.ycbcr_enc);
> + }
This isn't wrong, but it is perfectly fine to keep the DEFAULT here and let
the application call V4L2_MAP_.
I get the feeling this patch is a workaround for subdev errors. Either that,
or the commit log doesn't give me enough information to really understand the
problem that's being addressed here.
Regards,
Hans
> + }
> +
> *fmt = sdformat->format;
>
> if (sdformat->pad == CSI_SINK_PAD) {
>
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