TDA4VH-Q1: Can CSI-Rx module handle two 4K cameras at YUV422-8bit / 30 fps?

Hi,

Yes, it can handle 2 cameras, as long as total lane speed is less than max supported. What issue do you see when using two camera? 

Regards,

Brijesh

Hi Brijesh,

We tested 1.0G per lane with this single 4K camera, it doesn't work (no display).

But 1.1G works normally: the video shown on display looks good.

So we guess 2.2 / 2.3 / 2.4 / 2.5G per lane should work when we connect two same cameras.

But none of them works with such two 4K cameras. Even both initial and peroid skew calibration (1~8k UI per frame) tried.

And 2.5G is just the lane speed in theory, what the maximum tested lane speed on TDA4VH? Is there a MIPI D-PHY Conformance Test report or other we can check? 

Thanks!

Hi,

Many customers have successfully enabled 2.5Gbps lane speed, so it does work fine. When you use 2.5Gbps lane speed, Does single camera work fine first? Can you please check it and confirm? 

Regards,

Brijesh

Hi Brijesh,

Sound great. We did test 2.5G with single 4K camera and it works.

What confusing us is why 2.2 / 2.3 / 2.4 / 2.5G cannot work with two 4K cameras, since 1.1G works with single camera.

Hi Yang,

But what error do you see when using 2 camera with 2.5Gbps lane speed? Do you see any overflow or it just does not capture?

Regards,

Brijesh

Hi Brijesh,

The output of first camera is

The second one have no data.

Hi zhang,

But even if the first camera does not have full image. Are you seeing short frame even for the first camera? It means the configured size is different than received frame size. Can you check if frame size is matching with the output frame size from the receiver? 

When you dont get any frame for the second one, are you sure that second one is being transmitted? Are the virtual channel and datatype set correctly? 

Can you please share performance stats and lets see if there is any frames drops ?

Regards,

Brijesh

Hi Brijesh,

   I write two images from the capture node. The frame size is matching with the output frame size from the receiver.

  One camera can work correctly , the virtual channel and datatype are set correctly.

The perfprmance stats is the image.

Hi zhang,

I see a lot of overflows in the CSIRX, strmFifoOverflowCount is set to 987. That's too high for the 488 frames captured. 

One question, are you using 12bit RAW input image? If yes, then can you try setting tivx_capture_inst_params_t.numPixels variable to value 0x1 and check it?

Regards,

Brijesh

Hi Brijesh,

Our D-PHY test report shown that, there is only one failed item, the Data Lane HS Entry: Data Lane TLPX Value is lower 5ns then required minimum 50ns.

So will this failure influces the CSI-Rx in TDA4VH?

Thanks!

Hi Yang,

Not an expert here, will have to check with HW team. But yes, if it is out of specs, there is a possibility that it may not work due to HS entry not detected correctly.

Regards,

Brijesh 

Hi Brijesh,

I use YUV422 UYVY input image,the bit per pixel is 16. Can I set tivx_capture_inst_params_t.numPixels to value 0x1 ? That means 2 pixels per clock. 

Regards,

Zhang

Hi Zhang,

Yes, can be set. But it might require additional setting. can you give it a try? 

Regards,

Brijesh

Hi Brijesh,

Sure, I'll try to set it.

Regards,

Zhang

Sure, please check if dual mode is enabled for this case. This is required as per specs.

Regards,

Brijesh

Hi Brijesh,

I have tested this case. It works.Thanks a lot.

CSL_CsirxDMAConfig.dataSizeShift is the Size item in the table.

CSL_CsirxDMAConfig.dualPkgEnable is the dual mode.

Csirx_InstCfg.numPixelsStrm0 is the Pixel transmit mode used.

I've found  the different configures just for  FVID2_CSI2_DF_YUV422_8B.

The rtos sdk has wrong configures. The right is below as the TRM

The Csirx driver has bug. The code is in "csirx_drvUdma.c".

Is it Right?

Regards,

Zhang

Hi Zhang,

YUV422 capture had an issue in the SDK8.6. It is supposed to be fixed in the SDK9.0. But dual pixel mode may not be tested/verified. I will raise this issue and will be fixed. 

gavin zhang said:

I have tested this case. It works.Thanks a lot.

So both the channels with 4K resolution works fine. Can you please confirm? and if there are no further questions, please close this ticket.

Regards,

Brijesh

Hi Brijesh,

Brijesh Jadav said:

YUV422 capture had an issue in the SDK8.6. It is supposed to be fixed in the SDK9.0

We're using SDK 8.2

Hi Yang,

Don't recollect exactly on SDK8.2. but it might not be supporting dual pixel mode for YUV422 mode. Could you please use above table and configure CSIRX? I have raised this issue with the team and will be fixed in the next release. 

jira.itg.ti.com/.../PDK-13294

Regards,

Brijesh