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SN65DSI86-Q1: Does the sn65dsi86-q1 support the dp display？

zhang qi
Prodigy 20 points
Part Number: SN65DSI86-Q1
Other Parts Discussed in Thread: SN65DSI86, TEST2

Hi team,

I was Implemented GPU software to read the panel EDID information and program the DSI86 Video Registers with the Video format that is expected to be displayed on the eDP panel, the software can light LG LP079QX1 edp panel up by single chanel and dual chanel dsi input, however using sn65dsi86 to connect some dp monitor,the EDID is readable, and Semi auto link training is succeful,but monitor dose not show anything，i was tried sn65dsi86’s test pattern and the phenomenon remains unchanged.is the sn65dsi86 supports driving dp monitors？if support，how can I quickly solve the current problem？

Best Regards,

Eddy

  • 0
    TI__Guru**** 176811 points

    Eddy

    Most DP monitors do not support ASSR. If this is the case, DSI86’s ASSR will need to be disabled by making ASSR_CONTROL read/write instead of read-only. The first step to make ASSR_CONTROL read/write is to make sure TEST2 pin is be sampled high at the rising edge of EN pin. It is recommended to pull TEST2 pin to 1.8V thru a 1k to 10k resistor. Once TEST2 is high, the following steps must be performed:

    1. Write 0x07 to register 0xFF. This will select Page 7.
    2. Write 0x01 to register 0x16. This will make ASSR_CONTROL to be read/write.
    3. Write 0x00 to register 0xFF. This will select Page 0.
    4. Write 0 to bits 1:0 at register 0x5A. This will change from ASSR to Standard DP.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 20 points

    Hi David,

    Your suggestion worked, thank you for your kind support.

    Have a nice day~

    Eddy