Re: [PATCH] [media] imx: csi: retain current field order and colorimetry setting as default

[Philipp Zabel <p.zabel@pengutronix.de>]

On Thu, 2017-04-06 at 17:43 +0200, Hans Verkuil wrote:
> On 04/06/2017 04:54 PM, Philipp Zabel wrote:
> > 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@pengutronix.de>
> >>> ---
> >>> 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.
> > 
> > This is the subdev. sdformat is passed in from userspace, so we have to
> > deal with it being set to ANY. I'm trying hard right now not to return
> > ANY though. The values in sdformat->format are applied to fmt down
> > below.
> 
> Do you have a git tree with this patch? It is really hard to review without
> having the full imx-media-csi.c source.

The patch applies on top of

  https://github.com/slongerbeam/mediatree.git imx-media-staging-md-v14

I have uploaded a branch

  git://git.pengutronix.de/git/pza/linux imx-media-staging-md-v14+color

with the patch applied on top.

> I think one problem is that it is not clearly defined how subdevs and colorspace
> information should work.

regards
Philipp