Am Donnerstag, dem 20.05.2021 um 15:37 +0300 schrieb Laurent Pinchart:

Hi Martin,

On Thu, May 20, 2021 at 12:54:27PM +0200, Martin Kepplinger wrote:

quoted

Am Mittwoch, dem 19.05.2021 um 18:46 +0300 schrieb Laurent
Pinchart:

quoted

On Wed, May 19, 2021 at 05:21:11PM +0200, Martin Kepplinger
wrote:

quoted

Am Mittwoch, dem 19.05.2021 um 04:14 +0300 schrieb Laurent
Pinchart:

quoted

On Tue, May 18, 2021 at 04:39:00PM +0200, Martin Kepplinger
wrote:

quoted

Am Sonntag, dem 16.05.2021 um 01:55 +0300 schrieb Laurent
Pinchart:

quoted

On Tue, May 04, 2021 at 05:59:39PM +0200, Martin
Kepplinger wrote:

[snip]

quoted

I fixed mipi -> csi link. I had the DT port descriptions for mipi
csi
wrong.

\o/

quoted

now, just because I think it makes sense, I do:

media-ctl --set-v4l2 "'csi':0 [fmt:SGBRG10/640x480 colorspace:raw]"

which now prints:

Device topology
- entity 1: csi (2 pads, 2 links)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev0
        pad0: Sink
                [fmt:SGBRG10_1X10/640x480 field:none colorspace:raw
xfer:none ycbcr:601 quantization:full-range]
                <- "imx8mq-mipi-csis.0":1 [ENABLED,IMMUTABLE]
        pad1: Source
                [fmt:SGBRG10_1X10/640x480 field:none colorspace:raw
xfer:none ycbcr:601 quantization:full-range]
                -> "csi capture":0 [ENABLED,IMMUTABLE]

- entity 4: csi capture (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video1
        pad0: Sink
                <- "csi":1 [ENABLED,IMMUTABLE]

- entity 10: imx8mq-mipi-csis.0 (2 pads, 2 links)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev1
        pad0: Sink
                <- "hi846 2-0020":0 []
        pad1: Source
                -> "csi":0 [ENABLED,IMMUTABLE]

This subdev doesn't seem to report formats on its sink and source
pads,
which is weird. I've had a quick look at the .get_fmt() and
.set_fmt()
implementations in the code you've posted, and they're wrong. They
shouldn't pass the calls to the source subdev with
v4l2_subdev_call(),
they should instead implement get and set format on this subdev. You
can
look at the imx7-mipi-csis driver to see how that's done. Once you'll
have fixed this, you'll have to set the format on each pad with
media-ctl to make sure formats through the pipeline match.

The only location where you imx8mq-mipi-csis driver should use
v4l2_subdev_call() is in .s_stream(), to propagate the operation to
the
source.

By the way, I'd replace every occurence of "csis" with "csi2" in your
driver. The name "csis" in the i.MX7 driver comes from the CSI-2 RX
IP
core that is named CSIS. That's not the case on the i.MX8QM.

quoted

- entity 15: hi846 2-0020 (1 pad, 1 link)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev2
        pad0: Source
                [fmt:SGBRG10_1X10/640x480 field:none
colorspace:raw]
                -> "imx8mq-mipi-csis.0":0 []

You need to enable this link, the following should do

media-ctl -l "'hi846 2-0020':0 -> 'imx8mq-mipi-csis.0':0 [1]"

quoted

quoted

ok makes sense, even though I basically just allow a set of formats
without yet having to configure anything format-specific (I can at
least use bits-per-pixel later, so it makes sense to have them).
nevermind. I again append the current driver I use here.

then I do:

media-ctl --set-v4l2 "'csi':0 [fmt:SGBRG10/640x480 colorspace:raw]"
media-ctl --set-v4l2 "'imx8mq-mipi-csi2.0':0 [fmt:SGBRG10/640x480
colorspace:raw]"
media-ctl -l "'hi846 2-0020':0 -> 'imx8mq-mipi-csi2.0':0 [1]"

which gets me:

Device topology
- entity 1: csi (2 pads, 2 links)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev0
	pad0: Sink
		[fmt:SGBRG10_1X10/640x480 field:none colorspace:raw
xfer:none ycbcr:601 quantization:full-range]
		<- "imx8mq-mipi-csi2.0":1 [ENABLED,IMMUTABLE]
	pad1: Source
		[fmt:SGBRG10_1X10/640x480 field:none colorspace:raw
xfer:none ycbcr:601 quantization:full-range]
		-> "csi capture":0 [ENABLED,IMMUTABLE]

- entity 4: csi capture (1 pad, 1 link)
            type Node subtype V4L flags 0
            device node name /dev/video0
	pad0: Sink
		<- "csi":1 [ENABLED,IMMUTABLE]

- entity 10: imx8mq-mipi-csi2.0 (2 pads, 2 links)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev1
	pad0: Sink
		[fmt:SGBRG10_1X10/640x480]
		<- "hi846 2-0020":0 [ENABLED]
	pad1: Source
		[fmt:SGBRG10_1X10/640x480]
		-> "csi":0 [ENABLED,IMMUTABLE]

- entity 15: hi846 2-0020 (1 pad, 1 link)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev2
	pad0: Source
		[fmt:SGBRG10_1X10/640x480 field:none colorspace:raw]
		-> "imx8mq-mipi-csi2.0":0 [ENABLED]

but streaming still fails with:

[  352.255129] imx7-csi 30a90000.csi1_bridge: media bus code not
compatible with the pixel format set on the video node: 1 != 0
[  352.266439] imx7-csi 30a90000.csi1_bridge: capture format not valid