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

over 5 years ago

0 Ikechukwu Anyiam over 5 years ago

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 Shu-Cheng LIN over 5 years ago 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 Ikechukwu Anyiam over 5 years ago 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 Shu-Cheng LIN over 5 years ago 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?

DSI84-3.txt

//=====================================================================
// 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 Shu-Cheng LIN over 5 years ago 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 Ikechukwu Anyiam over 5 years ago 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 Shu-Cheng LIN over 5 years ago in reply to Ikechukwu Anyiam

Guru 11785 points

Hi Sirs,

Update initialization sequence picture as below.

0 Ikechukwu Anyiam over 5 years ago 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 venkatesh selvaraju over 5 years ago 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 Ikechukwu Anyiam over 5 years ago 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.

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SN65DSI84: SN65DSI84 bring-up issue