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TMDS1204: HDMI issue

prema R
Intellectual 965 points

Part Number: TMDS1204

HI

We are using HDMI redriver TMDS1204RNQR in our Versal (XCVE2302-1LSISFVA784) based design.The HDMI display pipeline initializes successfully, the monitor is detected via EDID, and the DRM pipeline is configured without errors. However, no video is transmitted to the monitor.I'm sharing the schematics. please let us know what could be the issue.HDMI2.pdf 

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  • 0
    TI__Guru**** 193091 points

    Hi,

    It looks like you are using TMDS1204 in I2C mode, are you programming it? If you are programming it, can you please share the register dump?

    Also what video resolution are you trying to support on the monitor?

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Intellectual 965 points

    Hi David

    I have attached the register dump


    Fullscreen tmds_registers.txt Download 
    root@hdmitmds:~# i2cdetect -y 0
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- 5e -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                         
root@hdmitmds:~# i2cget -y 0 0x5e 0x08
0x03
root@hdmitmds:~# i2cget -y 0 0x5e 0x09
0x00
root@hdmitmds:~# i2cget -y 0 0x5e 0x0A
0x8e
root@hdmitmds:~# i2cget -y 0 0x5e 0x0B
0x43
root@hdmitmds:~# i2cget -y 0 0x5e 0x0C
0x70
root@hdmitmds:~# i2cget -y 0 0x5e 0x0D
0x22
root@hdmitmds:~# i2cget -y 0 0x5e 0x0E
0x97
root@hdmitmds:~# i2cget -y 0 0x5e 0x0F
0x00
root@hdmitmds:~# i2cget -y 0 0x5e 0x10
0x02
root@hdmitmds:~# i2cget -y 0 0x5e 0x11
0x0f
root@hdmitmds:~# i2cget -y 0 0x5e 0x12
0x03
root@hdmitmds:~# i2cget -y 0 0x5e 0x13
0x00
root@hdmitmds:~# i2cget -y 0 0x5e 0x14
0x03
root@hdmitmds:~# i2cget -y 0 0x5e 0x15
0x05
root@hdmitmds:~# i2cget -y 0 0x5e 0x16
0x03
root@hdmitmds:~# i2cget -y 0 0x5e 0x17
0x05
root@hdmitmds:~# i2cget -y 0 0x5e 0x18
0x03
root@hdmitmds:~# i2cget -y 0 0x5e 0x19
0x05
root@hdmitmds:~# i2cget -y 0 0x5e 0x20
0x00
root@hdmitmds:~# i2cget -y 0 0x5e 0x31
0x00

  • 0 in reply to prema R
    TI__Guru**** 193091 points

    Hi,

    For register 0x09, can you please write 0x06 to it? This will force TMDS1204 to be always in active state.

    For register 0x0A, why do you enable lane swap (bit 7) and disable DDC snooping?

    I don't see register 0x20 or 0x31 being set, are you sending any HDMI2.0 or HDMI2.1 video resolution?

    Thanks

    David