AM62A7: After changing the user camera, yavta cannot collect image data

YuWei Wu

Part Number: AM62A7

Dear Ti staff,

On the EVM board, I replaced a new camera, the sensor model is ox03c, when I try to use yavta to collect camera data, the log information is as follows:

[  114.579927] ox03c 4-0036: INFO:[ox03c_get_pad_fmt]:function running!
[  114.597926] j721e-csi2rx 30102000.ticsi2rx: remote_pad->stream_count 1
[  114.604996] j721e-csi2rx 30102000.ticsi2rx: routing->num_routes 1
[  114.605003] j721e-csi2rx 30102000.ticsi2rx: r->source_pad 1 remote_pad->index 1
[  114.605015] max96716 4-0028: INFO:[max96716_get_frame_desc]: has been called，pad_number is 0
[  114.605038] max9295 4-0040: INFO:[max9295_get_frame_desc]: functions call, current subdevice name is serializer@40,ret is 0
[  114.605045] j721e-csi2rx 30102000.ticsi2rx: Ignore format 0x30314742 ctx->idx 0 df 0x2b vc 0 size 1
[  114.605274] max96716 4-0028: INFO:[max96716_get_frame_desc]: has been called，pad_number is 0
[  114.656164] max9295 4-0040: INFO:[max9295_get_frame_desc]: functions call, current subdevice name is serializer@40,ret is 0
[  114.656176] cdns-csi2rx 30101000.csi-bridge: bpp 12 has_fd 1
[  114.656190] cdns-csi2rx 30101000.csi-bridge:  Dump DPHY Configure link_freq 547200000
[  114.681080] cdns-csi2rx 30101000.csi-bridge:  Dump DPHY Configure hs_clk_rate 547200000
[  114.681088] cdns-csi2rx 30101000.csi-bridge:  Dump DPHY Configure lanes 4
[  114.696619] cdns-csi2rx 30101000.csi-bridge:  csi2rx_configure_external_dphy ret 0
[  114.704390] max96716 4-0028: INFO:[max96716_s_stream]: function call!
[  114.704401] max9295 4-0040: INFO:[max9295_s_stream]:function call!
[  114.717237] ox03c 4-0036: INFO:[ox03c_s_stream]:function running
[  114.922066] ox03c 4-0036: INFO:[ox03c_start_streaming] OX03C_1920X1280_60FPS set ret is 0
[  114.930336] ox03c 4-0036: INFO:[ox03c_start_streaming] ox03c_start_streaming finished 0
[  114.938594] max9295 4-0040: INFO:[max9295_start_streaming] max9295_start_streaming finished 0
[  114.947248] max96716 4-0028: INFO:[max96716_start_streaming] max96716_start_streaming finished 0
[  114.956455] j721e-csi2rx 30102000.ticsi2rx: Start DMA: 0 sizeimage 4915200

After waiting for a while, no image information is saved。

I checked the MIPI connection, MIPI has signal transmission to EVM board。

May I ask what might be the reason for this problem?

over 2 years ago

0 YuWei Wu over 2 years ago

Intellectual 270 points

To add: the camera resolution used is 1920*1280 60FPS

0 Jianzhong Xu over 2 years ago in reply to YuWei Wu

TI__Guru 58915 points

Hi Yuwei,

Would you mind sharing the log of "media-ctl -p" and the yavta command?

Thanks,

Jianzhong

0 YuWei Wu over 2 years ago in reply to Jianzhong Xu

Intellectual 270 points

Hi Jianzhong，

Thanks for the answer

I found that my problem is that the MIPI cable is unstable and I intend to replace the MIPI cable.

Can the AM62A EVM board use MIPI 2 lane to support 1920*1080 60FPS camera？

Thanks,

Yuwei

0 Jianzhong Xu over 2 years ago in reply to YuWei Wu

TI__Guru 58915 points

Hello Yuwei,

According to the AM62Ax data sheet, the CSI-2 interface supports up to 1.5Gbps per lane:

So if you use 2 lanes, you get up to 3Gbps bandwidth. For 1920*1080 60FPS camera, if the raw data is in 10-bit, the total data rate is 1920*1080*10-bit*60fps = 1.2Gbps, which is well below the maximum 2-lane bandwidth of 3Gbps.

Regards,

Jianzhong

0 YuWei Wu over 2 years ago in reply to Jianzhong Xu

Intellectual 270 points

Hi Jianzhong，

Thanks for the answer.

In the sample program provided, the camera driver file name is imx219.c. A parameter named IMX219_PIXEL_RATE is configured in this file. This parameter seems to be related to link_freq and hs_clk_rate. How should IMX219_PIXEL_RATE be calculated?

The method is described in another article, but the calculation is not clear.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1185941/sk-tda4vm-mipi/4498030?tisearch=e2e-sitesearch&keymatch=PIXEL_RATE#4498030

Suppose I use a camera with 1920*1080 resolution, FPS is 60, bpp is 16, and the number of lanes is 2. How should IMX219_PIXEL_RATE be calculated?

Thanks,

Yuwei

0 Jianzhong Xu over 2 years ago in reply to YuWei Wu

TI__Guru 58915 points

Hi Yuwei,

This actually is a question for Sony. Below is what I found from the IMX219 data sheet:

For 2-lane, the calculation given in the other thread you referred to looks correct: 912Mbps/lane * 2-lane / 10-bit = 182.4MPixel/sec.

However, for 4-lane, the numbers don't work out: 726Mbps/lane * 4-lane / 10-bit = 290.4MPixel/sec, instead of 280.8 in the table.

So there may be some discrepancies for 4-lane in the data sheet. If you really need to get to the bottom of this, you'll probably have to ask Sony.

Regards,

Jianzhong

0 YuWei Wu over 2 years ago in reply to Jianzhong Xu

Intellectual 270 points

Hi Jianzhong，

Thanks for answering my question

Regards,

Yuwei

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AM62A7: After changing the user camera, yavta cannot collect image data