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Original question:

SN65DSI84: Question for SN65DSI84 DSI input swap

SN65DSI84: Some problem with sn65dsi84 chip to light up the LCD

Lumina Gui
Genius 3850 points

Part Number: SN65DSI84
Other Parts Discussed in Thread: DSI-TUNER

Hi Sir,

 In our teak project, we using sn65dsi84 chip to light up the LCD. But we have encountered some problems and need the technical support. The problem description is as follows:

Q1. When the Mipi signal is converted to LVDS signal, the LCD does not display

Q2. When the colorbar function test of sn65dsi84 is turned on, the LCD has no display

I added the schematic diagrams and parameter setting to the following file. Can u help to check whether our current configuration parameters are correct. If not, please provide us with correct configuration parameters. 

The related issues of Display.docx

Hope to hear your reply, and if more information was needed, please let us know.

Thanks,

Best Regards

  • 0 in reply to Ikechukwu Anyiam
    Genius 3850 points

    Hi Anyiam,

    Thanks a lot. After carefully checking the information in your link, I will give my parameter configuration as follows.

    1. We have used "DSI Tuner 2.0.exe" to generate CSR list file as the following:

    0x09              0x00
0x0A              0x05
0x0B              0x10
0x0D              0x00
0x10              0x26
0x11              0x00
0x12              0x26
0x13              0x00
0x18              0x7a
0x19              0x00
0x1A              0x03
0x1B              0x00
0x20              0x00
0x21              0x05
0x22              0x00
0x23              0x00
0x24              0xd0
0x25              0x02
0x26              0x00
0x27              0x00
0x28              0x21
0x29              0x00
0x2A              0x00
0x2B              0x00
0x2C              0x02
0x2D              0x00
0x2E              0x00
0x2F              0x00
0x30              0x02
0x31              0x00
0x32              0x00
0x33              0x00
0x34              0x10
0x35              0x00
0x36              0x05
0x37              0x00
0x38              0x2c
0x39              0x00
0x3A              0x43
0x3B              0x00
0x3C              0x10
0x3D              0x00
0x3E              0x00

0x0D              0x01
Wait 10 ms
0x09              0x01
Wait 10 ms

    2. And after writing the above value to CSRs, we dump these CSRs, as the following show.

    [  394.763440] sn65dsi84_reg_dump: 0x09 = 0x00
[  394.768680] sn65dsi84_reg_dump: 0x0a = 0x85
[  394.774611] sn65dsi84_reg_dump: 0x0b = 0x10
[  394.779393] sn65dsi84_reg_dump: 0x0d = 0x01
[  394.784546] sn65dsi84_reg_dump: 0x10 = 0x26
[  394.789447] sn65dsi84_reg_dump: 0x11 = 0x00
[  394.794935] sn65dsi84_reg_dump: 0x12 = 0x26
[  394.799645] sn65dsi84_reg_dump: 0x13 = 0x00
[  394.804692] sn65dsi84_reg_dump: 0x18 = 0x7a
[  394.809998] sn65dsi84_reg_dump: 0x19 = 0x00
[  394.814690] sn65dsi84_reg_dump: 0x1a = 0x03
[  394.819367] sn65dsi84_reg_dump: 0x1b = 0x00
[  394.824043] sn65dsi84_reg_dump: 0x20 = 0x00
[  394.828747] sn65dsi84_reg_dump: 0x21 = 0x05
[  394.833599] sn65dsi84_reg_dump: 0x22 = 0x00
[  394.839458] sn65dsi84_reg_dump: 0x23 = 0x00
[  394.844787] sn65dsi84_reg_dump: 0x24 = 0xd0
[  394.850022] sn65dsi84_reg_dump: 0x25 = 0x02
[  394.855457] sn65dsi84_reg_dump: 0x26 = 0x00
[  394.861493] sn65dsi84_reg_dump: 0x27 = 0x00
[  394.866637] sn65dsi84_reg_dump: 0x28 = 0x21
[  394.872607] sn65dsi84_reg_dump: 0x29 = 0x02
[  394.877549] sn65dsi84_reg_dump: 0x2a = 0x00
[  394.882543] sn65dsi84_reg_dump: 0x2b = 0x00
[  394.887284] sn65dsi84_reg_dump: 0x2c = 0x02
[  394.891988] sn65dsi84_reg_dump: 0x2d = 0x00
[  394.896662] sn65dsi84_reg_dump: 0x2e = 0x00
[  394.901342] sn65dsi84_reg_dump: 0x2f = 0x00
[  394.906185] sn65dsi84_reg_dump: 0x30 = 0x02
[  394.910870] sn65dsi84_reg_dump: 0x31 = 0x00
[  394.915499] sn65dsi84_reg_dump: 0x32 = 0x00
[  394.920158] sn65dsi84_reg_dump: 0x33 = 0x00
[  394.924783] sn65dsi84_reg_dump: 0x34 = 0x10
[  394.929531] sn65dsi84_reg_dump: 0x35 = 0x00
[  394.934413] sn65dsi84_reg_dump: 0x36 = 0x05
[  394.939118] sn65dsi84_reg_dump: 0x37 = 0x00
[  394.944109] sn65dsi84_reg_dump: 0x38 = 0x2c
[  394.948817] sn65dsi84_reg_dump: 0x39 = 0x00
[  394.953652] sn65dsi84_reg_dump: 0x3a = 0x43
[  394.958520] sn65dsi84_reg_dump: 0x3b = 0x00
[  394.963330] sn65dsi84_reg_dump: 0x3c = 0x10
[  394.968094] sn65dsi84_reg_dump: 0x3d = 0x00
[  394.972767] sn65dsi84_reg_dump: 0x3e = 0x00
[  394.977377] sn65dsi84_reg_dump: 0x0d = 0x01
[  394.982105] sn65dsi84_reg_dump: 0x09 = 0x00
[  394.997166] 
[  394.997166] sn65dsi84_reg_dump: 0xe5 = 0x00  (First write 0xff to scr(0xe5), wait for 1ms, then read csr(0xe5))

    3. We enable "test pattern" to set CSR 0x3c to 0x10. But color bar don't display to lcd. Can I know the reason for this?

    Thanks,

    Best Regards

  • +1 in reply to Lumina Gui
    TI__Mastermind 35130 points

    Hi Lumina,

    Please share the .dsi file you used to generate the settings (press ctrl+e to export the .dsi file from the DSI-Tuner), as well the datasheet for your display.

    Regards,

    I.K. 

  • 0 in reply to Ikechukwu Anyiam
    Genius 3850 points

    Hi Anyiam,

    Thanks a lot. We have found the reason for this problem and solved it.

    Best Regards

  • +1 in reply to Lumina Gui
    TI__Mastermind 35130 points

    Hi Lumina,

    Glad you resolved the issue. It'd be helpful to other people if you clarified how you solved the problem.

    Regards,

    I.K.