Mipi CSI-2 camera frames lost on IMX8M Mini

jfontain88 — Wed, 30 Jun 2021 12:50:12 GMT

Hi everybody

am working on a new mipi csi-2 camera integration on IMX8M Mini but I am a bit confused about some settings... I have a ov10650 (with ov495 ISP) sensor which outputs me MIPI CSI-2. The output is YUV uncompressed format, 1824x940 at 60fps. I can program the CSI-2 settings such as number of lanes working (1 to 4) and datarate on each lane (400Mbps to 1600Mbps).

Everything works fine for the moment: my own driver (based on ov5640-mipi-v2) recognize well the sensor, mxc-mipi-csi works well with mipi-csi imx8mm's interface and mx6s_capture with the csi-bridge (don't know if this one is needed but i activated it anyway:

[ .... ] mx6s-csi 32e20000.csi1_bridge: initialiasing [ .... ] mxc_mipi-csi 32e30000.mipi_cs: mipi csi v4l2 device registered [ .... ] CSI: Registered sensor subdevice: mxc_mipi-csi.0 [ .... ] mxc_mipi-csi 32e30000.mipi_cs: lanes: 2, hs-settle: 17, clk_settle: 0, wclk: 1, freq: 333000000 [ .... ] mxc_mipi-csi 32e30000.mipi_cs: Registered sensor subdevice: ov10650 1-0024 [ .... ] ov10650 1-0024: Camera is found

When i try to get frames with gstreamer (through v4l2), the debug interface of mxc-mipi-csi get me some errors (here on a test with 400Mbps, 2 lanes):

Command: gst-launch-1.0 v4l2src num-buffers=1 ! video/x-raw ! jpegenc ! filesink location=test.jpg Output: Setting pipeline to PAUSED ... Pipeline is live and noes not need PREROLL ... Setting pipeline to PLAYING ... [ .... ] ov10650 1-0024: set-stream: enabled <- stuck here and am forced to abort with ctrl+c ^C handling interrupt [ .... ] mxc_mipi-csi.0: Frame End events: 0 [ .... ] mxc_mipi-csi.0: Frame Start events: 664 [ .... ] mxc_mipi-csi.0: Non-image data after odd frame events: 0 ... [ .... ] mxc_mipi-csi.0: FIFO Overflow Error events: 0 [ .... ] mxc_mipi-csi.0: Lost Frame End Error events: 664 [ .... ] mxc_mipi-csi.0: Lost Frame Start Error events: 0 Setting pipeline to NULL ... Freeing pipeline ...

Q1: On the device tree there is so many things that I don't understand regarding clocks and i would appreciate some help about it How do I know which clock i need to set up? How can I calculate its value? Especially for mipi_clk, phy_clk, disp_axi and disp_apb ? I am attempted to set mipi_clk to the datarate of my lanes (= 400Mbps for exemple so putting 400MHz) ?

Q2: The "real" question would be: Regarding one configuration (number-of-lanes + Datarate of the lane), which settings do I need to update and where do I update it? For the number of lane it is ok for me but not for the datarate.

Q3: Do you have any solution for the Lost Frame Ends errors debugged my the mipi-csi driver?

Thanks a lot for your help!

i.MX ProcessorsのトピックMipi CSI-2 camera frames lost on IMX8M Mini

Mipi CSI-2 camera frames lost on IMX8M Mini