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AM625: DPI output not full screen

Allen Chiu
Prodigy 80 points

Part Number: AM625

Hi, TI community,

We're working on am625 and tried to output (1360x768 or 1280x720) resolutions to different monitors (DPI, VGA interface), but only some monitors can output full-screen. 

We use other platforms to output the same resolution on the same monitor, it works, and we can get full-screen output.

So this monitor shouldn't be a problem.

Also, I tried the monitor's auto adjust, but it failed, please check pic below.



# am62 output 1360x768 with kmstest
    

root@am62xx-evm:~# kmstest
Connector 0/@40: DPI-1
  Crtc 0/@38: 1360x768@60.00 74.536 1360/22/44/102/? 768/4/5/36/? 60 (60.00) 0x0 0x48
  Plane 0/@31: 0,0-1360x768
    Fb 49 1360x768-XR24
press enter to exit



Do you know any display settings or DSS settings we can try?


Thanks,
Allen

  • 0
    TI__Mastermind 45065 points

    Hi Allen,

    Few questions for clarifications:

    1. Are you converting DPI signal to HDMI? Based on my understanding, monitors don't have DPI signal as inputs so I am assuming you are using a bridge here.

    2. Is the testing performed on TI SK EVM or custom hardware? If it's custom hardware, what bridges are being used for the signal conversion?

    3. I understand it works on different platforms but are they using the same bridge (SIL9022A) for signal conversion?

    4. You mentioned some monitors can output full screen so could you share the differences (mode, resolution and width/height) between the monitors that work and do not work?

    Regards,
    Krunal

  • 0 in reply to Krunal Bhargav34
    Prodigy 80 points

    1. Are you converting DPI signal to HDMI? Based on my understanding, monitors don't have DPI signal as inputs so I am assuming you are using a bridge here.

    We use VGA (D-sub) to connect the monitor.

    2. Is the testing performed on TI SK EVM or custom hardware? If it's custom hardware, what bridges are being used for the signal conversion?

    3. I understand it works on different platforms but are they using the same bridge (SIL9022A) for signal conversion?

    It's custom hardware, and bridges I will check with our HW, and give feedback.

    4. You mentioned some monitors can output full screen so could you share the differences (mode, resolution and width/height) between the monitors that work and do not work?

    We tried the same settings on i.mx8(mode, resolution, width/height, same monitor). 


    Thanks,
    Allen

  • 0 in reply to Krunal Bhargav34
    Prodigy 80 points

    Hi , 

    I tried to output "1368x768" resolution on am62, and it works. I can see full-screen now.


    But that seems strange to me. The resolution on imx8 is 1360x768, but on am62 I need to set 1368x768.

    Anyway, we can adjust output to 1368x768, but if you know the difference please let me know, thanks.

    root@st-imx8mp:~# fbset                  

mode "1360x768-0"
	# D: 0.000 MHz, H: 0.000 kHz, V: 0.000 Hz
	geometry 1360 768 1360 768 32
	timings 0 0 0 0 0 0 0
	accel true
	rgba 8/16,8/8,8/0,0/0
endmode
    root@am62xx-evm:~# fbset

mode "1368x768"
    geometry 1368 768 1368 768 32
    timings 0 0 0 0 0 0 0
    accel true
    rgba 8/16,8/8,8/0,0/0
endmode


    Thanks,
    Allen