DS90UB960-Q1: How to switch between ports in deserializer 6.9 kernel version driver

Blessy Abraham

Part Number: DS90UB960-Q1

Tool/software:

I am working with an i.MX8MN processor connected to a deserializer module - ds90ub960, which is further connected to a serializer and then to an image sensor. I am currently using Linux kernel version 6.9 for my drivers.

I need to switch the ports in the deserializer dynamically to capture data from individual cameras connected to the deserializer. However, I am not sure how to achieve this.

My Setup:

Processor: i.MX8MN
Deserializer driver: ds90ub960.c
Linux kernel version: 6.9

What is the recommended way to switch ports from the deserializer driver in ds90ub960.c 6.9 kernel version? As I do not see any implementation done to capture image from individual ports.

8 months ago

0 Darrah Merillat 8 months ago

TI__Mastermind 26510 points

Hello,

Thanks for reaching out. If you are looking to control which port's data is being output by the 960, then register 0x20 can be programmed to output video data from specific ports. Bits 7:4 correspond to port3 - port 0 respectively. By setting the corresponding bit to 0, data will be forwarded and output by the 960. Note, that actively changing the forwarding may result in some errors being seen directly after the change. Simply write the desired value to register 0x20 using the proper I2C write structure of the processor you are using.

0 Blessy Abraham 8 months ago in reply to Darrah Merillat

Prodigy 50 points

Hi Darrah,

Is there any way to capture from individual ports from user-space with the driver in the below link,
linux/drivers/media/i2c/ds90ub960.c at master · torvalds/linux · GitHub
Without modifying the driver?

0 Darrah Merillat 8 months ago in reply to Blessy Abraham

TI__Mastermind 26510 points

Hello,

This driver seems to have been developed outside of the FPD-Link TI team so I am unable to support it directly. However, if you have I2C access on the boards, you can manually write to the registers for port forwarding in the case that the driver is not able to support I2C.

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DS90UB960-Q1: How to switch between ports in deserializer 6.9 kernel version driver

My Setup: