On Thu, 2017-04-06 at 16:20 +0200, Hans Verkuil wrote:
> 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]"
To be more clear, this media-ctl command will call VIDIOC_SUBDEV_S_FMT
on the 'ipu1_csi0':0 sink pad during the propagation phase, with field
and colorspace set to whatever was propagated from the
'tc358743 1-000f':0 pad in the previous steps (as returned by
VIDIOC_SUBDEV_G_FMT on the 'ipu1_csi0_mux':2 source pad).
> > 4) media-ctl --set-v4l2 "'ipu1_csi0':0[fmt:UYVY8_1X16/1920x1080@1/60]"
And this media-ctl command will call VIDIOC_SUBDEV_S_FMT on the
'ipu1_csi0':0 sink pad with V4L2_FIELD_ANY (since there is no "field:"
set), and with V4L2_COLORSPACE_DEFAULT (since there is no colorspace:"
set) and so on. I don't want the correct values from step 3) to be
replaced with DEFAULT here.
> > 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,
So the VIDIOC_SUBDEV_S_FMT callback has to check for DEFAULT values and
do something about them.
> > 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) {
> >
regards
Philipp
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