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Original question:

J722SXH01EVM: CSI0 distortion during multiple vc id after FIFO overflow

AM67A: CSI0 has flicker on first open vc_id channel

Evan Williams
Intellectual 665 points

Part Number: AM67A

Hi,

I am trying to root cause where flicker is coming from in only the first virtual channel of csi0.

I can open 4 channels at a time, and see no flicker on 3 of the channels. If I open only 2 channels, say vc_id 2/3, then vc_id 2 will have the flicker. Has someone seen this before?

This is sort of the opposite of the related issue I'm referencing above. Basically, the frame ends early instead of starting late.
I highlighted the difference in a red box. This happens about every 30 seconds, but sometimes more frequently.
We are using SDK 11 with the latest cdns_csi2rx patches.
am67a_csi0_shift.png

  • 0
    TI__Guru 62270 points

    Hi Evan,

    Would you mind sharing the "media-ctl" output?

    Thank you.

    Jianzhong

  • +1 in reply to Jianzhong Xu
    Intellectual 665 points

    Hi Jianzhong,

    Please find the output below:
    The flicker happens no matter what resolution I use, and I can open only one stream and it still has the issue.

    media-ctl -p
Media controller API version 6.12.43

Media device information
------------------------
driver          j721e-csi2rx
model           TI-CSI2RX
serial
bus info        platform:30102000.ticsi2rx
hw revision     0x1
driver version  6.12.43

Device topology
- entity 1: 30102000.ticsi2rx (6 pads, 6 links, 4 routes)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev0
        routes:
                0/0 -> 1/0 [ACTIVE]
                0/1 -> 2/0 [ACTIVE]
                0/2 -> 3/0 [ACTIVE]
                0/3 -> 4/0 [ACTIVE]
        pad0: SINK
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                [stream:1 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                [stream:2 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                [stream:3 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                <- "cdns_csi2rx.30101000.csi-bridge":1 [ENABLED,IMMUTABLE]
        pad1: SOURCE
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                -> "30102000.ticsi2rx context 1":0 [ENABLED,IMMUTABLE]
        pad2: SOURCE
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                -> "30102000.ticsi2rx context 2":0 [ENABLED,IMMUTABLE]
        pad3: SOURCE
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                -> "30102000.ticsi2rx context 3":0 [ENABLED,IMMUTABLE]
        pad4: SOURCE
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                -> "30102000.ticsi2rx context 4":0 [ENABLED,IMMUTABLE]
        pad5: SOURCE
                -> "30102000.ticsi2rx context 5":0 [ENABLED,IMMUTABLE]

- entity 8: cdns_csi2rx.30101000.csi-bridge (5 pads, 2 links, 4 routes)
            type V4L2 subdev subtype Unknown flags 0
            device node name /dev/v4l-subdev1
        routes:
                0/0 -> 1/0 [ACTIVE]
                0/1 -> 1/1 [ACTIVE]
                0/2 -> 1/2 [ACTIVE]
                0/3 -> 1/3 [ACTIVE]
        pad0: SINK
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                [stream:1 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                [stream:2 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                [stream:3 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                <- "max96724 4-002e":0 [ENABLED,IMMUTABLE]
        pad1: SOURCE
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                [stream:1 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                [stream:2 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                [stream:3 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb ycbcr:601 quantization:full-range]
                -> "30102000.ticsi2rx":0 [ENABLED,IMMUTABLE]
        pad2: SOURCE
        pad3: SOURCE
        pad4: SOURCE

- entity 14: max96724 4-002e (5 pads, 5 links, 4 routes)
             type V4L2 subdev subtype Unknown flags 0
             device node name /dev/v4l-subdev2
        routes:
                1/0 -> 0/0 [ACTIVE]
                2/0 -> 0/1 [ACTIVE]
                3/0 -> 0/2 [ACTIVE]
                4/0 -> 0/3 [ACTIVE]
        pad0: SOURCE
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
                [stream:1 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
                [stream:2 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
                [stream:3 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
                -> "cdns_csi2rx.30101000.csi-bridge":0 [ENABLED,IMMUTABLE]
        pad1: SINK
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
                <- "tevs 13-0039":0 [ENABLED,IMMUTABLE]
        pad2: SINK
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
                <- "tevs 14-003a":0 [ENABLED,IMMUTABLE]
        pad3: SINK
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
                <- "tevs 15-003b":0 [ENABLED,IMMUTABLE]
        pad4: SINK
                [stream:0 fmt:UYVY8_1X16/1920x1080 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range]
                <- "tevs 16-003c":0 [ENABLED,IMMUTABLE]

- entity 22: tevs 13-0039 (1 pad, 1 link, 0 routes)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev3
        pad0: SOURCE
                [stream:0 fmt:UYVY8_1X16/1920x1080@1/60 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range
                 crop.bounds:(0,0)/1920x1080
                 crop:(0,0)/1920x1080]
                -> "max96724 4-002e":1 [ENABLED,IMMUTABLE]

- entity 26: tevs 14-003a (1 pad, 1 link, 0 routes)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev4
        pad0: SOURCE
                [stream:0 fmt:UYVY8_1X16/1920x1080@1/60 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range
                 crop.bounds:(0,0)/1920x1080
                 crop:(0,0)/1920x1080]
                -> "max96724 4-002e":2 [ENABLED,IMMUTABLE]

- entity 30: tevs 15-003b (1 pad, 1 link, 0 routes)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev5
        pad0: SOURCE
                [stream:0 fmt:UYVY8_1X16/1920x1080@1/60 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range
                 crop.bounds:(0,0)/1920x1080
                 crop:(0,0)/1920x1080]
                -> "max96724 4-002e":3 [ENABLED,IMMUTABLE]

- entity 34: tevs 16-003c (1 pad, 1 link, 0 routes)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev6
        pad0: SOURCE
                [stream:0 fmt:UYVY8_1X16/1920x1080@1/60 field:none colorspace:srgb xfer:srgb ycbcr:601 quantization:full-range
                 crop.bounds:(0,0)/1920x1080
                 crop:(0,0)/1920x1080]
                -> "max96724 4-002e":4 [ENABLED,IMMUTABLE]

- entity 40: 30102000.ticsi2rx context 1 (1 pad, 1 link)
             type Node subtype V4L flags 0
             device node name /dev/video2
        pad0: SINK
                <- "30102000.ticsi2rx":1 [ENABLED,IMMUTABLE]

- entity 46: 30102000.ticsi2rx context 2 (1 pad, 1 link)
             type Node subtype V4L flags 0
             device node name /dev/video3
        pad0: SINK
                <- "30102000.ticsi2rx":2 [ENABLED,IMMUTABLE]

- entity 52: 30102000.ticsi2rx context 3 (1 pad, 1 link)
             type Node subtype V4L flags 0
             device node name /dev/video4
        pad0: SINK
                <- "30102000.ticsi2rx":3 [ENABLED,IMMUTABLE]

- entity 58: 30102000.ticsi2rx context 4 (1 pad, 1 link)
             type Node subtype V4L flags 0
             device node name /dev/video5
        pad0: SINK
                <- "30102000.ticsi2rx":4 [ENABLED,IMMUTABLE]

- entity 64: 30102000.ticsi2rx context 5 (1 pad, 1 link)
             type Node subtype V4L flags 0
             device node name /dev/video6
        pad0: SINK
                <- "30102000.ticsi2rx":5 [ENABLED,IMMUTABLE]


    Seems like if I keep my lane configuration set to only 2 lanes, then it prevents the issue. I might be able to tune the link rates to make this work for our application... It's not ideal though.

    I managed to find a combination of link rates using 2 data lanes that is sufficient for our application.