AM572x USB1 is not working in U-boot and Linux

Hi Biser,

    I am attaching the USB schematics part here. In this design  we are providing 5V suuply to usb connector from other supply, and we are using USB as a HOST mode always.

How is the VBUS supply connected?

Hi Biser,
We directly connected 5V(which is generated internally in the board from LDO) to the USB connector VBUS pin. Finally we removed the L23 Ferrite Bead , and USB port VBUS is supplied from LDO directly.

Regards
Kishore

Hi Biser,

             We made new connections for USB-0 according to  AM572x IDK EVM schematics(which is shown in page:26). Still we are getting same issue.

Any thing I need to change in u-boot to disable the HUB functionality on USB-0 ?

I enabled few logs in the u-boot , the following messages are coming while executing the usb start command.

U-Boot# usb reset

resetting USB...

Starting the controller

USB XHCI 1.00

scanning bus 0 for devices... New Device 0

2 ports detected

individual port power switching

standalone hub

individual port over-current protection

power on to power good time: 20ms

hub controller current requirement: 0mA

port 1 is removable

port 2 is removable

cannot reset port 1!?

1 USB Device(s) found

      scanning usb for storage devices...

Probing for storage

0 Storage Device(s) found

U-Boot#

U-Boot#

please suggest what all changes are required in u-boot  .

Regards

Kishore

Kishore,

If possible, I always tried to avoid debug usb issues in uboot due to its limited debug capability. Have you tried if your USB0 port works in Linux? If it doesn't, better to debug it in Linux first; If not, we will go back debugging it in uboot.

Hi Biser,
I am checking the usb0 functionality in Linux. In Linux only keyboard and mouse are getting detected(CLASS 3 HIDdevices). USB MASS storage and other USB devices are not getting detected in Linux.

Below log is for HID device detection and lsusb response

[ 75.287498] usb 1-1: new low-speed USB device number 72 using xhci-hcd
[ 75.438727] usb 1-1: New USB device found, idVendor=1a2c, idProduct=0c21
[ 75.445590] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 75.454583] usb 1-1: Product: USB Keyboard
[ 75.459033] usb 1-1: Manufacturer: USB
[ 75.466037] usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 75.476673] usb 1-1: ep 0x82 - rounding interval to 64 microframes, ep desc says 80 microframes

root@am57xx-evm:~# lsusb
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 072: ID 1a2c:0c21 China Resource Semico Co., Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

root@am57xx-evm:~# lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
|__ Port 1: Dev 72, If 0, Class=Human Interface Device, Driver=, 1.5M
|__ Port 1: Dev 72, If 1, Class=Human Interface Device, Driver=, 1.5M

Why other USB devices are not getting detecting in Linux ?


Regards
Kishore A

When you attach any high-speed or super-speed device, does dmesg give any log?

I am suspecting your PLL is off. Do you use the same 20MHz crystal as that on the TI EVM?

Hi Bin Liu,
while connecting the high speed devices nothing is coming in dmesg .

How about the crystal clock I asked?

Hi,
We are using 20MHZ crystal , which is same as in EVM .

Kishore,

Please run the following sequence to collect a kernel debug log.

- Rebuild the kernel to enable Dynamic-Debug, if it wasn't enabled;
- Boot the board, run the following command to enable logging:
# echo 'module xhci_hcd =p' > /sys/kernel/debug/dynamic_debug/control
- Attach a high-speed usb device to the board usb port, then run the following command to collect the debug log:
# dmesg > am57x-usb-host-dyndebug.log

Hi Biser,

               Now I am able to use the usb-1 port(bus) as a usb2.0 host  in Linux . For this I modified the Linux dts file.

On our board we able to use the USB -1 and USB-2 ports as a usb 2.0 hosts in Linux ,  But Our requirement is to use the usb-1 as a host  in u-boot.

is there any modifications I have to do in u-boot source code ?

how to disable usb3.0 functionality(because we are using as a usb2.0 host ) on usb-1 driver in u-boot ?

Regards

Kishore kumar A