[v3,0/8] imx7/imx8mm media / csi patches

Hey everyone,

thanks for the feedback in v2.

Changes in v3:
* Dropped PATCH v2 5/9, applied in commit a7a52e146d0e
* Added R-b Laurent Pinchart to PATCH 1 & 4
* Fix bpp check in PATCH 3

Below is the original message slightly modified to match the v3 changes.

This is a set of patch for imx7 media drivers based on next-20220308. With
this set I was able to capture video frames from a MIPI CSI-2 camera in my
TQMa8MQML + MBA8MX hardware. The actual camera used is a Vision Components
'VC MIPI IMX327 C' camera. IMX327 is compatible to IMX290. Patch 8 shows the
DT overlay I'm using, not suitable for merging.
Please ignore the FPGA part, this is mainly for power supply and GPIO reset
line. This is currently a custom driver I'm working on, but I do not want to
focus on in this series.

Please note I tested this only on this imx8 platform.

First thanks to Dorota for the patchset at [1] (patches 1-4) which is necessary
to capture correct images.

Starting from patch 5 there are small fixes which allows me to configure my
media device.

Device configuration:
```
media-ctl -l "'imx290 2-001a':0->'csis-32e30000.mipi-csi':0 [1]"
media-ctl -V "'imx290 2-001a':0 [fmt:SRGGB10_1X10/1920x1080 field:none colorspace:raw]"
media-ctl -V "'csi':0 [fmt:SRGGB10_1X10/1920x1080 field:none colorspace:raw]"
v4l2-ctl -d0 --set-fmt-video width=1920,height=1080,pixelformat='RG10',field=none
media-ctl -p
```

The media-ctl topology is:
```
$ media-ctl -p
Media controller API version 5.17.0

Media device information
------------------------
driver          imx7-csi
model           imx-media
serial          
bus info        platform:32e20000.csi
hw revision     0x0
driver version  5.17.0

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:SRGGB10_1X10/1920x1080 field:none colorspace:raw xfer:none ycbcr:601 quantization:full-range]
                <- "csis-32e30000.mipi-csi":1 [ENABLED,IMMUTABLE]
        pad1: Source
                [fmt:SRGGB10_1X10/1920x1080 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: csis-32e30000.mipi-csi (2 pads, 2 links)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev1
        pad0: Sink
                [fmt:SRGGB10_1X10/1920x1080 field:none colorspace:raw]
                <- "imx290 2-001a":0 [ENABLED]
        pad1: Source
                [fmt:SRGGB10_1X10/1920x1080 field:none colorspace:raw]
                -> "csi":0 [ENABLED,IMMUTABLE]

- entity 15: imx290 2-001a (1 pad, 1 link)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev2
        pad0: Source
                [fmt:SRGGB10_1X10/1920x1080 field:none colorspace:raw]
                -> "csis-32e30000.mipi-csi":0 [ENABLED]
```

Note: MIPI CSI settle times are not calculated correctly right now and need a
manual overwrite:
echo 13 > /sys/kernel/debug/32e30000.mipi-csi/ths_settle 
echo 2 > /sys/kernel/debug/32e30000.mipi-csi/tclk_settle

I did not focus on v4l2-compliance tool, this is a future task.

Regards,
Alexander

[1] https://patchwork.linuxtv.org/project/linux-media/patch/20211104113631.206899-2-dorota.czaplejewicz@puri.sm/

Alexander Stein (4):
  media: imx: imx7_media-csi: Add support for additional Bayer patterns
  media: imx: utils: Add more Bayer formats
  media: imx: utils: initialize local variable
  [DNI] arm64: dts: tqma8mqml: add IMX327 MIPI-CSI overlay

Dorota Czaplejewicz (4):
  media: imx: Store the type of hardware implementation
  media: imx: Forward type of hardware implementation
  media: imx: Use dedicated format handler for i.MX7/8
  media: imx: Fail conversion if pixel format not supported

 arch/arm64/boot/dts/freescale/Makefile        |   4 +
 .../imx8mm-tqma8mqml-mba8mx-imx327.dts        |  95 ++++++++++++
 drivers/staging/media/imx/imx-ic-prpencvf.c   |   3 +-
 drivers/staging/media/imx/imx-media-capture.c |  20 ++-
 drivers/staging/media/imx/imx-media-csi.c     |   3 +-
 drivers/staging/media/imx/imx-media-utils.c   | 136 +++++++++++++++++-
 drivers/staging/media/imx/imx-media.h         |  11 +-
 drivers/staging/media/imx/imx7-media-csi.c    |  15 +-
 8 files changed, 271 insertions(+), 16 deletions(-)
 create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-tqma8mqml-mba8mx-imx327.dts