• State TI Thinks Resolved
  • Locked Locked
  • Replies 10 replies
  • Answers 1 answer
  • Subscribers 34 subscribers
  • Views 2297 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SN65DSI84: SN65DSI84 bring-up issue

Shu-Cheng LIN
Guru 11785 points
Part Number: SN65DSI84
Other Parts Discussed in Thread: DSI-TUNER,

Hi Sirs,

Sorry to bother you

We test g104x1 and get the CSR list from DSI tuner. The panel  does not work. Is there anything we need to take care?

By the way, we have tried others panel but still didn't work.

Schematic

G104X1 Panel

Measure MIPI waveform and LVDS waveform.

MIPI

LVDS:

Bridge_In_DSI_DP0_

Bridge_Out_LVDS_A_TX_

Bridge_Out_LVDS_A_TX

  • 0
    TI__Mastermind 35130 points
    Hi Shu-Cheng,

    Please ensure to follow the initialization sequence. And also reference this troubleshooting guide: www.ti.com/.../slla356.pdf

    Regards,
    I.K.
  • 0 in reply to Ikechukwu Anyiam
    Guru 11785 points

    Hi Sirs,

    Thanks for your quick reply

    Actually we can output the test pattern, but the color is lighter.

    Do you have any recommendations about this issue?

  • 0 in reply to Shu-Cheng LIN
    TI__Mastermind 35130 points
    Hi Shu-Cheng,

    First, please confirm that you are following the initialization sequence in the datasheet. And can you also share the .dsi file export from the DSI-Tuner?

    Regards,
    I.K.
  • 0 in reply to Ikechukwu Anyiam
    Guru 11785 points

    Hi Sirs,

    Thanks for your reply

    We can get the color bar as below. Is it correct?




    D

    Fullscreen DSI84-3.txt Download 
    //=====================================================================
// Filename   : test.txt
//
//   (C) Copyright 2013 by Texas Instruments Incorporated.
//   All rights reserved.
//
//=====================================================================
0x09              0x00
0x0A              0x05
0x0B              0x10
0x0D              0x00
0x10              0x26
0x11              0x00
0x12              0x27
0x13              0x00
0x18              0x78
0x19              0x00
0x1A              0x03
0x1B              0x00
0x20              0x00
0x21              0x04
0x22              0x00
0x23              0x00
0x24              0x00
0x25              0x03
0x26              0x00
0x27              0x00
0x28              0x21
0x29              0x00
0x2A              0x00
0x2B              0x00
0x2C              0x64
0x2D              0x00
0x2E              0x00
0x2F              0x00
0x30              0x0a
0x31              0x00
0x32              0x00
0x33              0x00
0x34              0x64
0x35              0x00
0x36              0x0a
0x37              0x00
0x38              0x78
0x39              0x00
0x3A              0x12
0x3B              0x00
0x3C              0x10
0x3D              0x00
0x3E              0x00


The PLL_EN bit and SOFT_RESET bit are not set as they need to be set per the recommended sequence defined in the datasheet

     

  • 0 in reply to Shu-Cheng LIN
    Guru 11785 points

    Hi Sirs,

    Update our question as below

    You can see our test pattern , It’s different color with TI’s test pattern.

    We would like to know have any problem about our test pattern color?

    Our pattern

    TI pattern

  • 0 in reply to Shu-Cheng LIN
    TI__Mastermind 35130 points
    Hi Shu-Cheng,

    It looks like that gray bar is not quite correct. Your settings look okay but can you try adjusting the HPW value? Additionally, I have not yet received confirmation that the initialization sequence in the datasheet is being followed. Please confirm that you're following the sequence.

    Regards,
    I.K.
  • 0 in reply to Ikechukwu Anyiam
    Guru 11785 points

    Hi Sirs,

    Update initialization sequence picture as below.

  • 0 in reply to Shu-Cheng LIN
    TI__Mastermind 35130 points

    Hi Shu-Cheng,

    It doesn't look like the CLK is in HS before EN is asserted high.

    The sequence is as below from the datasheet:

    And here is an example from another customer:

    Regards,

    I.K. 

  • 0 in reply to Ikechukwu Anyiam
    Prodigy 10 points
    Hi Aniyam,

    I'm just started working on iMX8 with SN65DSI. It's not clear to me where to configure DSI CLK & DATA, EN pins either in dts or bridge driver. I can understand CSR registers to be programmed in bridge driver.

    Thanks
    Venkat
  • 0 in reply to venkatesh selvaraju
    TI__Mastermind 35130 points
    Hi venkatesh,

    Unfortunately I'm only able to help with register configurations for our device, and can't provide software/driver support. You would need to loop in an expert from NXP for support with configuring the iMX8 processor. But please let me know if you have questions about register settings for the SN65DSI84.

    Regards,
    I.K.