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FPS problem with FMC-MULTI-CAM4

prornetheus

Hello,

 

I'm using FMC-MULTI-CAM4 for camera input,

but it scores only 25.5 frames per second

 

in max9286_serdes.h, PCLK per frame setted to 88MHz for 30fps and could go up to 99MHz

if I set the PCLK per frame to 99MHz, the camera input could achieve 30fps?

 

regards, hanseung.

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  • 0

    Hanseung,

    If you increase the PCLK, you will probably saturate the data rate on the GMSL link.

    In order to achieve a higher frame rate, I would recommend to reduce the vertical blanking period.

    Regards,

    Mario.

  • 0 in reply to albertabeef

    Dear Mario,

     

    I could't find a variable named like "vertical blanking period" under :

    1. zcu102-rv-mc4-bsp/build/tmp/work-shared/zcu102-zynqmp/kernel-source/drivers/media/i2c/avt_multi_sensor_fmc/

    2. recipes-apps/video-qt2/files/src/video_lib/src/vcap_gmsl.c

     

    Where can I find it and modify it?

     

    In addition, My local FPGA 3rd party vendor recommended settings for AR0231 to achieve 32FPS

    I cannot be sure that setting these values to 9286 SERDES will achieve 32fps.

     

    //

    Target System Frequency: 80 MHz

    Input Clock Frequency: 27 MHz

     

    pll_refdiv = 5

    pll_fbdiv = 237

    pll_postdiv1 = 7

    pll_postdiv2 = 7

    hsdp clock = 159.98 MHz

    txss clock = 79.99 MHz

     

    External sensor core dividers:

    fb div (m) = 160

    ref div (n)= 9

    post div 1 (p1) = 1

    post div 2 (p2) = 6

    Sensor Pixel Clock: 80 MHz

     

    regards, Hanseung.

  • 0 in reply to prornetheus

    Hanseung,

    These settings are not available at the application level.

    You would need to modify the Linux kernel driver.

     

    If you really want to make these changes, I would recommend to start working with the "bare metal" factory test design.

    This design does not display the image on the monitor, but validates the capture pipelines up to the MIPI RX core.

     

     

    Regards,

     

    Mario.

Reply Children
  • 0 in reply to albertabeef

    Mario,

     

    I understand that I need to modify the kernel driver.

    Is AVNet developing a driver that enhances camera FPS? Or do you have a plan?

     

    I have not found a suitable way to change the vertical blanking period.

     

    Regards, Hanseung.

  • 0 in reply to prornetheus

    Hanseung,

     

    Here is an updated version of the linux kernel patch for the multi-camera FMC.

       0031-add-avt-multi-sensor-fmc-driver-2018-3-1080p30-720p60.patch

       https://avtinc.sharepoint.com/:u:/t/ET-Downloads/ETs1QSOusQpGsE-06ZQgA4MB9V0QkiXZq2pUfJKQQK2MGg


    It contains modifications for the following:
    - fixed frame rate of 30fps for 1080P resolution (previous version was 25fps)
    - fixed frame rate of 60fps for 720P resolution (previous version was 25fps)
    - center-cropped image for 720P resolution (previous version was top-left cropped)

     

    This file needs to be put in the following location in the petalinux project:

        {petalinux bsp}/project-spec/meta-user/recipes-kernel/linux/linux-xlnx/

     

    Also, the following file needs to be modified:

        {petalinux bsp}/project-spec/meta-user/recipes-kernel/linux/linux-xlnx_%.bbappend

    Replace this line:

        file://0031-add-avt-multi-sensor-fmc-driver-2018.3.patch \

    With this line:

        file://0031-add-avt-multi-sensor-fmc-driver-2018-3-1080p30-720p60.patch \

     

    Regards,

     

    Mario.