TDA4VM: LINUX TIDSS remote display

Cherry Zhou

Part Number: TDA4VM

Hi team,

Here's an issue from the customer may need your help:

Customers are currently considering running linux on the A72 side and using QT for meter display. They have noticed that the dispc-related drivers are on the R5F side, see 3.2.2.4.5.2. Display Sharing Configuration Options: The Linux side needs to use resources such as the corresponding hardware pipeline overlay via remote display.

However, the settings in the dts are not seen in ti-processor-sdk-linux-j7-evm-08_00_00_08. So they would like to know more about how to modify or use the specified pipeline and overlay resources for the linux side.

1. is the above understanding correct?

2, the linux side uses two pipeline (vide1 and vidil2) to stream these two videos to the RTOS side and one pipeline vide2 on the RTOS side. Is it possible for a total of three pipeline to be stacked on overlay2 and output through VP2, or must it be done with remote display?

Could you help check this case? Thanks.

Best Regards,

Cherry

over 2 years ago

0 Brijesh Jadav over 2 years ago

TI__Guru**** 433165 points

Hi Cherry,

Cherry Zhou said:
1. is the above understanding correct?

Yes, this is correct. Display sharing is no longer supported. You need to use either A72 or R5F to control display.

Regards,

Brijesh

0 Cherry Zhou over 2 years ago in reply to Brijesh Jadav

TI__Mastermind 22235 points

Hello Brijesh,

Cherry Zhou said:
2, the linux side uses two pipeline (vide1 and vidil2) to stream these two videos to the RTOS side and one pipeline vide2 on the RTOS side. Is it possible for a total of three pipeline to be stacked on overlay2 and output through VP2, or must it be done with remote display?

Regarding question 2, if it's possible to achieve, if so, how does the R5F side get the data from the FB on the A72 side to overlay its own plane data? Or, there's no need to get it on the R5F side, just drop data on the A72 side to the corresponding two planes, so the overlay on the R5F side can get the data on the A72?

Thanks and Best Regards,

Cherry

0 Brijesh Jadav over 2 years ago in reply to Cherry Zhou

TI__Guru**** 433165 points

Hi Cherry,

The possible way is to use OpenVX display node, which takes input on A72 and the runs on R5F to submit the frame to the actual display pipeline..

Regards,

Brijesh

0 Cherry Zhou over 2 years ago in reply to Brijesh Jadav

TI__Mastermind 22235 points

Hi Brijesh,

Brijesh Jadav said:
The possible way is to use OpenVX display node,

Is there a demo program for reference in the SDK or from TI?

Thanks and regards,

Cherry

0 Brijesh Jadav over 2 years ago in reply to Cherry Zhou

TI__Guru**** 433165 points

Hi Cherry,

Yes, all vision demos, that uses display, internally uses OpenVX based display node.. You could refer to simple example like single-camera or multi-camera example.

Regards,

Brijesh

0 Cherry Zhou over 2 years ago in reply to Brijesh Jadav

TI__Mastermind 22235 points

Hi Brijesh,

Thanks.

As the discussion above, if TIOVX display node is used, dose it mean that the DRM framework and dss-related drivers on the linux side will not be used and obsolete?

Thanks and regards,

Cherry

0 Cherry Zhou over 2 years ago in reply to Cherry Zhou

TI__Mastermind 22235 points

Hi,

May I know is there any updates?

Thanks and regards,

Cherry

0 Brijesh Jadav over 2 years ago in reply to Cherry Zhou

TI__Guru**** 433165 points

Hi Cherry,

Cherry Zhou said:
As the discussion above, if TIOVX display node is used, dose it mean that the DRM framework and dss-related drivers on the linux side will not be used and obsolete?

Yes, in this case, DSS will be controlled from R5F and the way to access is by using TIOVX display node...

Regards,

Brijesh

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TDA4VM: LINUX TIDSS remote display