Hello :
I am porting a image sensor with mipi csi2 interface on imx6qp platform.
Now my image sensor(YUV422+VC0)data could display on HDMI1.
But my problem is there is a vertical line on HDMI screen like attatchment.
My analyze data workflow:
Sensor -> mipi D-phy csi2 TX -> mipi D-phy csi2 RX (imx6 side) -> memory -> display HDMI.
So i guess the vertical line is not generated by sensor, it maybe a mismatch or problem in mipi D-phy csi2 RX (imx6 side) -> memory .
Perhapes a issue with mismatch mipi RX freqence or a mistake buffer control .
Did anyone have faced this issue ?
How to analyze this issue ?
Best Regards.
Qingcai.
解決済! 解決策の投稿を見る。
Hi b45499:
I have resolved my problem.
First of all, thank you for your support.
Share my trouble shoot experiences to others:
1st: Configure your sensor or de-serializer to output ColorBar test pattern.
2rd: With ColorBar test pattern output ,you could anaylize the problem is or not Sensor issue.
3th: I also found the vertical line with ColorBar test pattern output.
So it maybe the HOST mipi-csi2-RX mismatch.
4th: I decreased mipi-csi2-TX(Sensor module) clock and decreased mipi-csi2-RX(HOST) clock from 1.6Gbps to 400Mbps .
Then the vertical line disappeared.
Best Regard
Qingcai
Hello,
I have the same vertical Line on the HDMI Screen. The Line appears if i go over approx 750 Mbps (4 Lane) on the CSI-2 Port.
The data workflow is the same as by Qingcai.
At the moment I have no idea why this is happen. My guess is, that the i.MX6 can not handle this amount of data. I Checked it on a Quad and a Quad Plus.
I work also with FPD-Link III and where I need the 800 Mbps.
Are where any Idea?
iMX6DQ TP2854 MIPI CSI2 720P HD-TVI camera surround view solution for Linux BSP
https://community.nxp.com/docs/DOC-328548
These maybe do help for you.
Hi b45499:
I have resolved my problem.
First of all, thank you for your support.
Share my trouble shoot experiences to others:
1st: Configure your sensor or de-serializer to output ColorBar test pattern.
2rd: With ColorBar test pattern output ,you could anaylize the problem is or not Sensor issue.
3th: I also found the vertical line with ColorBar test pattern output.
So it maybe the HOST mipi-csi2-RX mismatch.
4th: I decreased mipi-csi2-TX(Sensor module) clock and decreased mipi-csi2-RX(HOST) clock from 1.6Gbps to 400Mbps .
Then the vertical line disappeared.
Best Regard
Qingcai
Got it. Thanks for your sharing.
Good news~~
Hi b45499:
I have another question about this topic.
Now i decreased mipi-csi2-TX(Sensor module) clock and decreased mipi-csi2-RX(HOST) clock ,then the vertical line disappeared.
But i reviewed some documents about imx6 MIPI CSI2 spec.
The maximum bandwidth of the interface is:
• 200 MHz for a 4-lane configuration (800 Mb/s/lane, 400 MB/s)
Does it mean the maxim rate of imx6 is 800Mb/s per lane with 4-lane ?
In my project ,i used TIUB964 de-serilizer 4-lane output YUV422 data with 800 Mbps serial rate .
So my question is Why could appeare the vertical line with the same 800Mbps?
Could imx6 mipi-csi2-RX receive the mipi clock larger than 800Mbs/lane with 4-lane ?How to modify it ?
Best Regard
Qingcai
Hi b45499:
I have reviewed these Topic.But i think my question is not in these Topic.
Today, I do this test ahout my question .
1st: I dumped YUV data to a local file and opened the file by YUV analyze tool.
I could see the vertical issue line like mistake data in the picture.
2rd: I replaced imx6 device with my internal FPGA board, and showed YUV data in pc tool with the same sensor settings.
I could not see the vertical issue line.
So I think the mistake maybe come from MIPI-CSI2-RX .Right ?
Could you give me more suggestions?
Best Regards
Qingcai
Hi:
I have some tests on it.
1st : I moved my sensor to another angles. 90 degree,180 degree,270 degree or other scenes.
The vertical issue always have and does not change anymore;
So this is not a sensor issue .
2rd: I changed other sensors (2-lane YUV422 1280x720) to display on the same platform .
There is not any issues on screen ,no vertical lines.
So the hardware environment is OK.HDMI device or mipi D-phy RX module .
Best Regards.
Qingcai