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

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Message-ID: <1491494481.2392.102.camel@pengutronix.de>
Date:   Thu, 06 Apr 2017 18:01:21 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     Steve Longerbeam <slongerbeam@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, linux@...linux.org.uk, mchehab@...nel.org,
        nick@...anahar.org, markus.heiser@...marIT.de,
        laurent.pinchart+renesas@...asonboard.com, bparrot@...com,
        geert@...ux-m68k.org, arnd@...db.de, sudipm.mukherjee@...il.com,
        minghsiu.tsai@...iatek.com, tiffany.lin@...iatek.com,
        jean-christophe.trotin@...com, horms+renesas@...ge.net.au,
        niklas.soderlund+renesas@...natech.se, robert.jarzmik@...e.fr,
        songjun.wu@...rochip.com, andrew-ct.chen@...iatek.com,
        gregkh@...uxfoundation.org, shuah@...nel.org,
        sakari.ailus@...ux.intel.com, pavel@....cz,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH] [media] imx: csi: retain current field order and
 colorimetry setting as default

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@...gutronix.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@...0]"
> >>> 5) media-ctl --set-v4l2 "'ipu1_csi0':2[fmt:AYUV32/1920x1080@...0]"
> >>>
> >>> 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