Re: [PATCH v2 0/4] Support of MIPI CSI-2 for A83T

Paul Kocialkowski
2020-08-28T14:12:24Z

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Hi everyone,

On Fri 28 Aug 20, 15:17, Kévin L'hôpital wrote:
> This series adds the support for the MIPI CSI-2 controller for the A83T SoC.
> The CSI controller is the same as the V3s SoC that's why I put the A83T
> MIPI CSI-2 driver in sun6i-csi.
> My work is based on the Allwinner BSP for A83T and also on MIPI CSI-2
> specification for the A83T given by Allwinner.

To give a bit of context here, Kevin is our intern who worked on MIPI CSI-2
support on the A83t this summer. As we were approaching the end of the
internship, we wanted to publish the current state of the work as a working
reference and base for mainline support.

However, we are well aware that there are significant design issues in this
series, such as:
- not supporting the fwnode graph;
- not working with the DPHY API;
- adding MIPI CSI-2 support under the same dt compatible as parallel CSI;

and probably other things.

Bootlin is currently working on V3s MIPI CSI-2 support and we intend to respin
this series when submitting V3s MIPI CSI-2 support, with fixes to these design
issues.

So we hope you keep this in mind when reviewing the series, which is not meant
to be merged in its current state.

Thanks!

Paul

> v4l2-compliance SHA: not available, 32 bits
>
> Compliance test for sun6i-video device /dev/video0:
>
> Driver Info:
> Driver name : sun6i-video
> Card type : sun6i-csi
> Bus info : platform:camera
> Driver version : 5.5.0
> Capabilities : 0x84200001
> Video Capture
> Streaming
> Extended Pix Format
> Device Capabilities
> Device Caps : 0x04200001
> Video Capture
> Streaming
> Extended Pix Format
> Media Driver Info:
> Driver name : sun6i-csi
> Model : Allwinner Video Capture Device
> Serial :
> Bus info :
> Media version : 5.5.0
> Hardware revision: 0x00000000 (0)
> Driver version : 5.5.0
> Interface Info:
> ID : 0x03000003
> Type : V4L Video
> Entity Info:
> ID : 0x00000001 (1)
> Name : sun6i-csi
> Function : V4L2 I/O
> Pad 0x01000002 : 0: Sink, Must Connect
> Link 0x02000007: from remote pad 0x1000006 of entity 'ov8865 1-0036': Data, Enabled, Immutable
>
> Required ioctls:
> test MC information (see 'Media Driver Info' above): OK
> test VIDIOC_QUERYCAP: OK
>
> Allow for multiple opens:
> test second /dev/video0 open: OK
> test VIDIOC_QUERYCAP: OK
> test VIDIOC_G/S_PRIORITY: OK
> test for unlimited opens: OK
>
> Debug ioctls:
> test VIDIOC_DBG_G/S_REGISTER: OK (Not Supported)
> test VIDIOC_LOG_STATUS: OK
>
> Input ioctls:
> test VIDIOC_G/S_TUNER/ENUM_FREQ_BANDS: OK (Not Supported)
> test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
> test VIDIOC_S_HW_FREQ_SEEK: OK (Not Supported)
> test VIDIOC_ENUMAUDIO: OK (Not Supported)
> test VIDIOC_G/S/ENUMINPUT: OK
> test VIDIOC_G/S_AUDIO: OK (Not Supported)
> Inputs: 1 Audio Inputs: 0 Tuners: 0
>
> Output ioctls:
> test VIDIOC_G/S_MODULATOR: OK (Not Supported)
> test VIDIOC_G/S_FREQUENCY: OK (Not Supported)
> test VIDIOC_ENUMAUDOUT: OK (Not Supported)
> test VIDIOC_G/S/ENUMOUTPUT: OK (Not Supported)
> test VIDIOC_G/S_AUDOUT: OK (Not Supported)
> Outputs: 0 Audio Outputs: 0 Modulators: 0
>
> Input/Output configuration ioctls:
> test VIDIOC_ENUM/G/S/QUERY_STD: OK (Not Supported)
> test VIDIOC_ENUM/G/S/QUERY_DV_TIMINGS: OK (Not Supported)
> test VIDIOC_DV_TIMINGS_CAP: OK (Not Supported)
> test VIDIOC_G/S_EDID: OK (Not Supported)
>
> Control ioctls (Input 0):
> test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK
> test VIDIOC_QUERYCTRL: OK
> test VIDIOC_G/S_CTRL: OK
> test VIDIOC_G/S/TRY_EXT_CTRLS: OK
> test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK
> test VIDIOC_G/S_JPEGCOMP: OK (Not Supported)
> Standard Controls: 7 Private Controls: 0
>
> Format ioctls (Input 0):
> test VIDIOC_ENUM_FMT/FRAMESIZES/FRAMEINTERVALS: OK
> test VIDIOC_G/S_PARM: OK (Not Supported)
> test VIDIOC_G_FBUF: OK (Not Supported)
> test VIDIOC_G_FMT: OK
> test VIDIOC_TRY_FMT: OK
> test VIDIOC_S_FMT: OK
> test VIDIOC_G_SLICED_VBI_CAP: OK (Not Supported)
> test Cropping: OK (Not Supported)
> test Composing: OK (Not Supported)
> test Scaling: OK
>
> Codec ioctls (Input 0):
> test VIDIOC_(TRY_)ENCODER_CMD: OK (Not Supported)
> test VIDIOC_G_ENC_INDEX: OK (Not Supported)
> test VIDIOC_(TRY_)DECODER_CMD: OK (Not Supported)
>
> Buffer ioctls (Input 0):
> test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: OK
> test VIDIOC_EXPBUF: OK
> test Requests: OK (Not Supported)
>
> Total for sun6i-video device /dev/video0: 45, Succeeded: 45, Failed: 0, Warnings: 0
>
> Changes since V1:
> - Add more details in the cover letter.
> - Add a test to get the clocks to avoid an error for the platform without MIPI
> CSI-2.
> - Add more details in the register assignations.
> - Removed the support of multiple virtual channels because there is only one
> channel support in the CSI driver.
>
> Kévin L'hôpital (4):
> media: sun6i-csi: Fix the bpp for 10-bit bayer formats
> media: sunxi: sun6i-csi: Move the sun6i_csi_dev structure to the
> common header
> media: sunxi: sun6i-csi: Add support of MIPI CSI-2 for A83T
> ARM: dts: sun8i: a83t: Add support for the MIPI CSI-2 in CSI node
>
> arch/arm/boot/dts/sun8i-a83t.dtsi | 11 +-
> .../media/platform/sunxi/sun6i-csi/Makefile | 2 +-
> .../platform/sunxi/sun6i-csi/sun6i_csi.c | 96 +++++---
> .../platform/sunxi/sun6i-csi/sun6i_csi.h | 14 +-
> .../sunxi/sun6i-csi/sun8i_a83t_dphy.c | 39 ++++
> .../sunxi/sun6i-csi/sun8i_a83t_dphy.h | 16 ++
> .../sunxi/sun6i-csi/sun8i_a83t_dphy_reg.h | 39 ++++
> .../sunxi/sun6i-csi/sun8i_a83t_mipi_csi2.c | 217 ++++++++++++++++++
> .../sunxi/sun6i-csi/sun8i_a83t_mipi_csi2.h | 16 ++
> .../sun6i-csi/sun8i_a83t_mipi_csi2_reg.h | 179 +++++++++++++++
> 10 files changed, 595 insertions(+), 34 deletions(-)
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun8i_a83t_dphy.c
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun8i_a83t_dphy.h
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun8i_a83t_dphy_reg.h
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun8i_a83t_mipi_csi2.c
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun8i_a83t_mipi_csi2.h
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun8i_a83t_mipi_csi2_reg.h
>
> --
> 2.17.1
>

--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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