TDA4VM: How to set MIPI DSI to 4 lanes mode?(default setting is 2 lanes )

Hi,

Can you please refer to below faq?

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1019565/faq-processor-sdk-j721e-how-to-change-lane-speed-and-number-of-lanes-for-dsi-output

Regards,

Brijesh

HI, Brijesh:

Thank for your reply, I checked this patch but can not get any changes about lanes number? Could you point it for me?

Hi Chen,

There is a configurable input parameter numOfLanes in the display driver. Please set it to 4 or required number of lanes..

Regards,

Brijesh

HI, Brijesh;

I applied  patch 5554.Added_Support_For_lane_speed_in_DSI_Driver.patch, but Oscilloscope can not get any signal for DSI port。 please help to check again, thanks!

Hi wenyu chen,

Can you please first check if 2lane works fine, ie in the default settings? Also how are you checking the output? Are you running some usecase before probing signals? 

Regards,

Brijesh

HI, Brijesh;

DSI0_D0N & DSI0_D0P     DSI0_D1N & DSI_D1P work fine, i can get signals from the 2 lane, but DSI0_D2N & DSI0_D2P     DSI0_D3N & DSI_D3P are alway High level。

thanks！

ok, strange, let me check if there is anything else required to enable data-lane3 and data-lane4. 

HI, Brijesh;

file :  j721e/rtos/common/app_cfg_mcu2_0.h  

i should open  #define ENABLE_DSS_DSI  ? default is #undef ENABLE_DSS_DSI.

Hi wenyu chen,

Yes, this macro needs to be enabled and eDP needs to be disabled in the app_cfg_mcu2_0.h header file in the vision apps, in order to use DSI output for vision apps demo.

Regards,

Brijesh

HI, Brijesh;

If there is any more process about this question, let me know, thans!

HI, Brijesh;

Thank you for your support, Is there any process on this issue ?

Hi wenyu chen,

What exactly is connected at the DSI output? If you are using EVM with Ub941 serializer, can you please refer to below link for enabling 4 lanes for DSI output? 

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/983773/j721excpxevm-dsi-display-port-not-working/3677208#3677208

Regards,

Brijesh