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RTOS/SN65DSI86: [SN65DSI86] Display showed white screen a moment after trigger power up.

wenyu Ben
Intellectual 500 points
Part Number: SN65DSI86

Tool/software: TI-RTOS

Hi sir,


We can see the while screen a moment during display turning on.
and it's happen during screen protection screen.

1) 100% reproduce rate :
 a. press power key system to enter sleep.
 b. Close the cover (Lid).
 c. Open the cover (lid) to wakeup sytem from suspend.

2)Display turning on / off is fine by behavior of press power key , there is no issue.
that might be panel response timing with the sn65dsi86.

3) Calor bar mode is no issue.


4) Attached the reproduce video clip for your reference.

 

Can you please advise if sn65dsi86 have a way to configure video streaming output timing

after pwm signal outuput , some settings of response time with the panel during panel initialize phase?
or advice any further investigation with this issue  sn65dsi86 to panel thanks.

Thanks

Ben.

  • 0
    TI__Guru*** 145455 points

    assign to right person

  • 0 in reply to Brian Zhou
    TI__Guru*** 145455 points

    what software is doing during this screen protection?  I also suggest dump DSI86 registers such as F0 thru F8.

  • 0 in reply to Brian Zhou
    Intellectual 500 points

    Hi Brian ,

    The software is WIn10 , we find the root cause , the white screen signal is send from OS by oscilloscope monitor on DSI path ,

    Want to know if a workaround idea that sn65dsi86 can adjust the response(delay) time to output signal to panel when resumeing 

    Thanks.

    Below is the edp dump and DPCD dump from panel.

    --------------------------------------------------------
    Dump sn65dsi86 edp register
    --------------------------------------------------------
    00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
    --------------------------------------------------------
    00| 36 38 49 53 44 20 20 20 02 00 82 00 00 01 00 00
    10| 26 00 5B 5B 00 00 00 00 00 00 00 00 00 00 00 00
    20| 80 07 00 00 38 04 00 00 00 00 00 00 64 00 00 00
    30| 01 00 00 00 A2 00 38 00 30 00 03 00 06 00 00 00
    40| 01 00 00 00 80 00 B6 08 74 04 06 01 39 00 64 00
    50| 01 00 80 07 38 04 20 00 40 E4 0C 00 11 00 70 80
    60| A0 60 A4 00 00 00 00 00 00 00 00 00 00 00 00 00
    70| 00 00 00 00 00 01 02 01 80 81 00 00 00 00 00 00
    80| 00 00 00 00 00 00 00 00 00 1F 7C F0 C1 07 1F 7C
    90| F0 C1 07 20 80 00 01 04 01 00 00 00 00 00 00 00
    A0| 4B FF 00 00 00 02 00 00 00 00 00 00 00 00 00 00
    B0| 04 78 AC AC 08 6C 9C 9C 0C 5C 5C 5C 0C 0C 0C 0C
    C0| 3F 3F 0F 00 00 00 00 00 00 00 00 00 00 00 00 00
    D0| 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    E0| 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    F0| 00 00 00 00 01 00 00 00 01 00 00 00 00 00 00 00
    --------------------------------------------------------
    Dump Panel EDID
    --------------------------------------------------------
    00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
    --------------------------------------------------------
    00| 00 FF FF FF FF FF FF 00 06 AF 6D 10 00 00 00 00
    10| 00 18 01 04 95 1C 10 78 02 6B A0 96 59 57 95 27
    20| 1D 4E 52 00 00 00 01 01 01 01 01 01 01 01 01 01
    30| 01 01 01 01 01 01 9C 3B 80 36 71 38 3C 40 30 64
    40| 31 00 14 9B 10 00 00 18 00 00 00 0F 00 00 00 00
    50| 00 00 00 00 00 00 00 00 00 20 00 00 00 FE 00 41
    60| 55 4F 0A 20 20 20 20 20 20 20 20 20 00 00 00 FE
    70| 00 42 31 32 35 48 41 4E 30 31 2E 30 20 0A 00 80
    --------------------------------------------------------

  • 0 in reply to wenyu Ben
    TI__Guru**** 176811 points

    Ben

    Are you trying to stop the sending of the white screen? 

    If this is the case, one thing you could do is to clear and then set the VSTREAM_ENABLE bit (Bit 3 of Register 0x5Ah). 

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Intellectual 500 points

    Hi David, 

    This's OS issue , i can't control.

     To clear and then set the VSTREAM_ENABLE bit is not workable.

    thank for your information.

    BTW , I'll try other workaround .