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SK-AM62: How to add display resoltion mode in AM62 EVM.

Gibbs Shih
Expert 5705 points
Part Number: SK-AM62


Tool/software:

Dear Expert.

As title description.

I need to add HDMI OUT display mode  864x480, our software do not support it.

oot@am62xx-evm:~# modetest -M tidss
Encoders:
id      crtc    type    possible crtcs  possible clones
39      38      none    0x00000001      0x00000001

Connectors:
id      encoder status          name            size (mm)       modes   encoders
40      39      connected       HDMI-A-1        480x270         17      39
  modes:
        index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
  #0 1920x1080 60.00 1920 2008 2052 2200 1080 1082 1087 1125 148500 flags: phsync, pvsync; type: preferred, driver
  #1 1920x1080 60.00 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
  #2 1920x1080 59.94 1920 2008 2052 2200 1080 1084 1089 1125 148352 flags: phsync, pvsync; type: driver
  #3 1920x1080 50.00 1920 2448 2492 2640 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
  #4 1680x1050 59.88 1680 1728 1760 1840 1050 1053 1059 1080 119000 flags: phsync, nvsync; type: driver
  #5 1600x900 60.00 1600 1624 1704 1800 900 901 904 1000 108000 flags: phsync, pvsync; type: driver
  #6 1280x1024 60.02 1280 1328 1440 1688 1024 1025 1028 1066 108000 flags: phsync, pvsync; type: driver
  #7 1440x900 59.90 1440 1488 1520 1600 900 903 909 926 88750 flags: phsync, nvsync; type: driver
  #8 1280x720 60.00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver
  #9 1280x720 59.94 1280 1390 1430 1650 720 725 730 750 74176 flags: phsync, pvsync; type: driver
  #10 1280x720 50.00 1280 1720 1760 1980 720 725 730 750 74250 flags: phsync, pvsync; type: driver
  #11 1024x768 60.00 1024 1048 1184 1344 768 771 777 806 65000 flags: nhsync, nvsync; type: driver
  #12 800x600 60.32 800 840 968 1056 600 601 605 628 40000 flags: phsync, pvsync; type: driver
  #13 720x480 60.00 720 736 798 858 480 489 495 525 27027 flags: nhsync, nvsync; type: driver
  #14 720x480 59.94 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver
  #15 640x480 60.00 640 656 752 800 480 490 492 525 25200 flags: nhsync, nvsync; type: driver
  #16 640x480 59.94 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver

Need related information, which teach me add another display mode

Many Thanks

Gibbs

  • 0
    TI__Mastermind 44995 points

    Hi,

    Based on your above logs, the HDMI does not even support 864x480 so how would you enable it? 

    Regards,
    Krunal

  • 0 in reply to Krunal Bhargav34
    TI__Expert 5705 points

    Hi, Krunal

    Because I want to use HDMI connect to DLPC120 (DMD, https://www.ti.com/product/zh-tw/DLPC120-Q1)

    I feel a little bit curious, HDMI output support max 1920x1080, why can't support 864x480?

    I thought we can modify related driver to support 864x480, so I post this thread.

    May I know the reason? Is it AM62x limitation? Or just software driver problems (Not implement) ?

    Because I may need try to explain to customer.

    Many Thanks

    Gibbs

  • +1 in reply to Gibbs Shih
    TI__Mastermind 44995 points

    Hi,

    There is no HW or SW limitations from the SoC perspective. The SoC will communicate with your HDMI monitor through EDID protocol and the monitor will inform the SoC about the supported resolutions, respective timing and FPS information. For example, look at the modetest data from your above logs and it indicates all the different resolutions supported by your HDMI monitor. Based on the logs, your HDMI monitor does not list the resolution you are looking so SoC won't generate any signals. I have seen people online create fake EDID information and that tricks SoC into generating video signals but it's not something we test or support out of the box.

    Regards,
    Krunal