• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 97 subscribers
  • Views 688 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Capture video from FPGA

Prabhakar Lad
Guru 11260 points
Other Parts Discussed in Thread: TVP7002

Hi,

I am working on the custom 8148 board which doesnt have a tvp7002/tvp514x decoder chips we intend to get the video data from the FPGA and feed it into vip0/1, but the capture driver seems to make subdev calls to subdev driver (tvp7002/tv514x) as per v4l framework. So I intend to write a dummy decoder driver which registers a v4l2 subdev and return success for the subdev calls made by the bridge/host driver.

My question is the above work around fine Or is there any easy way to get around this ?

Thanks,

--Prabhakar Lad

  • 0
    TI__Guru* 80190 points
    Hello,

    Here is some link which might be in help:

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/169616
    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/p/218042/773907#pi239031349=1
    http://e2e.ti.com/support/embedded/linux/f/354/t/162958
    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/321313

    Best Regards,
    Margarita
  • 0 in reply to Margarita Gashova
    Guru 11260 points
    Hi Margarita,

    Thanks for links! But none of the links talk about FPGA emulating as subdevice so that OMX calls wont fail.

    Thanks,
    --Prabhakar Lad
  • 0 in reply to Margarita Gashova
    Guru 11260 points
    Hello,

    The capture modules takes the pdata from ti81xxvin_config structure, to the capture driver, with the following piece of code:

    static int __init ti81xx_vin_init(void)
    {
    int r;
    hdvpss_capture_dev.dev.platform_data = &ti81xx_hsvpss_capture_cfg;
    if (cpu_is_ti814x()) {
    hdvpss_capture_sdev_info[0].ti81xxvin_select_decoder =
    vps_ti814x_select_video_decoder;
    hdvpss_capture_sdev_info[0].ti81xxvin_set_mode =
    vps_ti814x_set_tvp7002_filter;
    hdvpss_capture_sdev_info[0].decoder_id = 0;
    hdvpss_capture_sdev_info[0].i2c_adapter_id = 3;
    hdvpss_capture_sdev_info[1].ti81xxvin_select_decoder =
    NULL;
    hdvpss_capture_sdev_info[1].ti81xxvin_set_mode =
    NULL;
    hdvpss_capture_sdev_info[1].decoder_id = 0;
    hdvpss_capture_sdev_info[1].i2c_adapter_id = 3;
    } else {
    .....
    }
    r = platform_device_register(&hdvpss_capture_dev);
    if (r)
    printk(KERN_ERR "unable to register ti81xx_vin device\n");
    else
    printk(KERN_INFO "registered ti81xx_vin device\n");
    return r;

    }

    In my case since the decoder is a fpga I'll fill the decoder_id/i2c_adapter_id to 0 (dont care) Is this data being also used by HDVPSS firmware ? Does the HDVPSS (for which no source code is available) makes calls to subdev using above data ?

    Thanks,
    --Prabhakar Lad