TDA2SG: Screen bottom 1 line problem in HDMI 1080P display

Hi,

Kindly note that concerned expert will be back in office next week and respond to your query.

Regards,

Rishabh

Hi Yousik Kim,

What driver do you use for HDMI configuration? is it RTOS driver or Linux driver?

Rgds,

Brijesh

Hello, Brijesh.

I'm using RTOS driver for HDMI.

The dss, dispc and hdmi is disabled in Linue kernel dts file.

Best Regards,
Yousik Kim.

Hi Kim,

It is very unlikely that there is some issue in timing. These timings for 1080p are checked with the analyzer. Are you sure there is a extra line at the start time and then later it goes away, just by reconnecting HDMI cable?

Rgds,

Brijesh

Hello, Brijesh.

When I reconnect the HDMI cable, it return to its original state.

And there was something wrong with the previous test.
So I tested again.

I've tried putting 1 pixel red lines in the first and last lines of the video buffer.

1. The red line of first line was displayed.
=> The beginning of the video was normal.
2. The last line (line 1079 on 1080p) was not shown.
=> So I drew the line 1078 and it was displayed.

3. And I drew the line 1078 in black.
=> The problem was reproduced.

I don't know the cause of this problem.

I think you should try the same test.

Best Regards,
Yousik Kim.

Hi Kim,

I did not get the last experiment. How did the problem reproduced? 

I mean to ask, are you observing one line less? or something else?

Rgds,

Brijesh

Hello, Brijesh.

My last experiment is a general state without any elements.

The results of this experiment are
1. The line 1079 is not shown.
2. The line 1078 is last line.
3. In the last line, black is not represented properly.

Best Regards,
Yousik Kim.

Hi,

Can you please share the value of the register 0x58040060?

Rgds,

Brijesh

Hello, Brijesh.

# omapconf read 0x58040060
04380780

The problem is currently being reproduced.

Best Regards,
Yousik Kim.

Hello Kim,

This is strange, as you could see, the size is configured correctly in the HDMI register, it is set to exactly 1920x1080..

Just for the experiment, can you try increasing height to 1081 and see if the last line is visible?

Rgds,

Brijesh

Hello, Brijesh.

Yes, the symptoms are so strange that it's hard to know the real cause.

1. height = 1081
# omapconf write 0x58040060 0x04390780
# omapconf read 0x58040060
04390780
Nothing has changed.
The same problem was reproduced.

2. height = 1079
# omapconf write 0x58040060 0x04370780
# omapconf read 0x58040060
04370780
The problem was not reproduced.
Of course, The line 1079 was not visible.

I think the problem is at the line 1079.

Best Regards,
Yousik Kim.

Hi Kim,

But for the second experiment, do you see line 1078? I want to first see if this is coming from HDMI or DSS itself. 

Rgds,

Brijesh

Hello, Brijesh.

Yes. I can see the line 1078. It's normal.

I think it's an HDMI or DSS problem, too.

Best Regards,
Yousik Kim.

Hi Kim,

We are still looking into it, give us some time.

Rgds,

Brijesh

Hi Kim,

We are still looking into this.

Rgds,

Brijesh

Hello, Brijesh.

Thanks for your hard work.
I'm waiting for you.

Best Regards,
Yousik Kim.

Hi Kim,

From the register configuration we are not able to get what could cause the last line issue you are seeing.
We will have to reproduce here and check the HDMI signals with the hdmi analyser to check if the signals are compliant with the standard.
This has some involved effort.
This would be tracked by the development team internally and we should be able close it by end of this month.

Regards,
Prasad

Hi Kim,

The display/TV you are using for checking, is certified to support the standard hdmi signals? and natively support the 1080p60 resolution?
Have you checked with some other display/TV?

Regards,
Prasad

Hello, Prasad.

We checked with about 5 different monitors displaying HDMI 1080p60 output from other devices without any problem.
We have confirmed that the same symptom occurs on all the monitors we checked.

Best Regards,
Yousik Kim.

Hi Kim,

Can you tell how are you configuring the HDMI from application?
If you are running VSDK which use case are you running?
Is this on the EVM or the custom board?

Can you connect to a TV instead of a monitor and check?

Regards,
Prasad

In the usecase below, changing the NULL SRC_OUT_WIDTH and NULL SRC_OUT_HEIGHT to 1920 and 1080 and outputting the image in black can reproduce the problem.
PROCESSOR_SDK_VISION_03_07_00_00/vision_sdk/apps/src/rtos/usecase/null_src_display
This is the same for both EVM board and custom board.

The same symptom occurs when connected to a TV too.