Hi Team
My CTM use TUSB8041 in their system
CTM CPU (LS1043a) is connected to the hub chip TUSB8041 (using the USB2.0 protocol). Currently, the kernel (4.14) on board cannot recognize the chip.
When the kernel starts, it obtains the state of the root hub port connected to the TUSB8041, and there is no PORT_CONNECTION state, which means that the hub chip does not have attatch to the root hub.
The D+ signal of the usb interface on the board hardware is always low. It is estimated that the root hub port cannot detect whether the hub chip is inserted.
Pls see attach file.
On the hardware, it is no problem to measure the clock and power signals on the Hub side.
Is it necessary to configure the hub chip through SMbus before the kernel can normally recognize and enumerate the hub chip?
Could you check SCH?