SN65DSI84: Blue cyan issue

Hey, Charles,

The problem you are seeing is with the internal test pattern or the DSI to LVDS pattern?

Could you take a video or picture of the problem you are seeing?

Thanks,
Zach

Zach,

Thank you for your reply

In normal mode, I have the white color that is blue cyan and with the internal test pattern I have the white that is dark blue/purple

For your information: the registers 0x18 = 0x18 (Format 2, Polarity Positive, single DSI/LVDS)

# in normal mode:

# with internal test pattern:

Thanks

Best regards,

Charles

All the registers:

i2cset -y -f 2 0x2c 0x0d 0x00
i2cset -y -f 2 0x2c 0x09 0x00
i2cset -y -f 2 0x2c 0x0a 0x05
i2cset -y -f 2 0x2c 0x0b 0x10
i2cset -y -f 2 0x2c 0x10 0x26
i2cset -y -f 2 0x2c 0x11 0x00
i2cset -y -f 2 0x2c 0x12 0x2B
i2cset -y -f 2 0x2c 0x18 0x1a
i2cset -y -f 2 0x2c 0x19 0x05
i2cset -y -f 2 0x2c 0x1a 0x00
i2cset -y -f 2 0x2c 0x1b 0x33
i2cset -y -f 2 0x2c 0x20 0x20
i2cset -y -f 2 0x2c 0x21 0x03
i2cset -y -f 2 0x2c 0x24 0x00
i2cset -y -f 2 0x2c 0x25 0x05
i2cset -y -f 2 0x2c 0x28 0x21
i2cset -y -f 2 0x2c 0x29 0x00
i2cset -y -f 2 0x2c 0x2c 0x0a
i2cset -y -f 2 0x2c 0x2d 0x00
i2cset -y -f 2 0x2c 0x30 0x36
i2cset -y -f 2 0x2c 0x31 0x00
i2cset -y -f 2 0x2c 0x34 0x0f
i2cset -y -f 2 0x2c 0x36 0x35
i2cset -y -f 2 0x2c 0x38 0x0f
i2cset -y -f 2 0x2c 0x3a 0x35
i2cset -y -f 2 0x2c 0x3c 0x10
i2cset -y -f 2 0x2c 0x0d 0x01
i2cset -y -f 2 0x2c 0x09 0x01

charles tata said:

i2cset -y -f 2 0x2c 0x18 0x1a

not 0x1A but 0x18

Charles

Our DSI Lan0 Line Time: 11.59µs

Charles,

I am looking into this now let me get back to you.

Thanks,

Zach

Charles,

Let's focus on the LVDS connection since the internal test pattern is showing problems.

Could you send me the snippets of all your DSI-TUNER tool settings that map to the i2c registers you shared above?

Also, I am assuming you are using the same display correct?

Are you using a reference clock or the DSI clock?

Have you checked the LVDS cable that you are using to make sure it is not damaged?

Thanks,

Zach

Hi Zach,

I'm sorry for my post but finally there was a mistake on the board, our EMS puts some component on the board in the wrong way

Now we have a good display, with still flickering but with the good color

We are trying to delete the spread specrtrum feature or Jitter on our SoM in order to erase the flickering

If you have some advice ?

Best Regards,

Charles