• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 33 subscribers
  • Views 467 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.

DS90UB941AS-Q1: display issue

Cherry Zhou
Mastermind 22235 points
Part Number: DS90UB941AS-Q1


Hi Team,

Our 941 application is shown in the following figure, using one DSI0 output to 941 ，941output two FPDLINK to 948，948 output two LVDS with a resolution of 1920* 1080P@60Hz Display screen.

The I2C register configurations for 941 and 948 are as follows：

The current problem is that the display screen is blurry and flickering. 

941 configure：

i2cset -f -y 1 0x0c 0x01 0x08 b
i2cset -f -y 1 0x0c 0x66 0x1A b
i2cset -f -y 1 0x0c 0x67 0x09 b
i2cset -f -y 1 0x0c 0x66 0x03 b
i2cset -f -y 1 0x0c 0x67 0x50 b
i2cset -f -y 1 0x0c 0x66 0x04 b
i2cset -f -y 1 0x0c 0x67 0x10 b
i2cset -f -y 1 0x0c 0x66 0x05 b
i2cset -f -y 1 0x0c 0x67 0x88 b
i2cset -f -y 1 0x0c 0x66 0x06 b
i2cset -f -y 1 0x0c 0x67 0x2F b
i2cset -f -y 1 0x0c 0x66 0x07 b
i2cset -f -y 1 0x0c 0x67 0x80 b
i2cset -f -y 1 0x0c 0x66 0x08 b
i2cset -f -y 1 0x0c 0x67 0x07 b
i2cset -f -y 1 0x0c 0x66 0x09 b
i2cset -f -y 1 0x0c 0x67 0x2D b
i2cset -f -y 1 0x0c 0x66 0x0A b
i2cset -f -y 1 0x0c 0x67 0x0C b
i2cset -f -y 1 0x0c 0x66 0x0B b
i2cset -f -y 1 0x0c 0x67 0x03 b
i2cset -f -y 1 0x0c 0x66 0x0C b
i2cset -f -y 1 0x0c 0x67 0x20 b
i2cset -f -y 1 0x0c 0x66 0x0D b
i2cset -f -y 1 0x0c 0x67 0x18 b
i2cset -f -y 1 0x0c 0x65 0x04 b
i2cset -f -y 1 0x0c 0x64 0x25 b
i2cset -f -y 1 0x0c 0x01 0x00 b

SOC DSI configure：
Resolution：1920x1080
Hsync：118
Hback：200
Hfront：4

Vsync：2
Vback：100
Vfront：38
framerate：60fps

dsi clk: 984M/2 = 498M (The DSI input clk is 498M for both positive and negative)

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Genius 14300 points

    Hi Cherry,

    Who is the tier 1 and OEM?

    Can the customer see the same flicker with PATGEN?

    Has the customer followed the DSI Bring up guide?

    Best Regards,

    Gil Abarca

  • 0 in reply to Gil Abarca Ramos
    TI__Mastermind 22235 points

    Hi Gil Abarca,

    Thank you for the support and the customer just raised the issue on e2echina forum.

    They have exported the reference configuration for the 941 development board. The SOC side also uses this version of configuration for initialization. Fortunately, the screen is currently on, but we have discovered a new issue. After the SOC wakes up from sleep, the display screen will flash, which is an inevitable phenomenon. Please help confirm if there is still a problem with the configuration parameters.

    The two 941 I2C parameters from the dump are as follows：

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Genius 14300 points

    Hi Cherry,

    Who is the tier 1 and OEM?

    Can you provide a full register dump file before and after the flicker? Customer only provided the main page of the 941 I also want to see the indirect pages for both devices.

    Is this also happening with PATGEN enabled?

    Best Regards,

    Gil Abarca