-----Original Message----- From: Bin Meng bmeng.cn@gmail.com Sent: Monday, June 04, 2018 9:28 PM To: Chris Welch Chris.Welch@viavisolutions.com Subject: Re: [U-Boot] usb start causes u-boot restart with TUSB8041 hub
Hi Cris,
On Mon, Jun 4, 2018 at 11:14 PM, Chris Welch Chris.Welch@viavisolutions.com wrote:
-----Original Message----- From: Bin Meng bmeng.cn@gmail.com Sent: Monday, June 04, 2018 10:43 AM To: Chris Welch Chris.Welch@viavisolutions.com Cc: u-boot@lists.denx.de Subject: Re: [U-Boot] usb start causes u-boot restart with TUSB8041 hub
Hi Chris,
On Mon, Jun 4, 2018 at 9:12 PM, Chris Welch Chris.Welch@viavisolutions.com wrote:
We are developing a product based on the TI AM5728 EVM. The product has
a TUSB8041 USB hub on the AM5728 USB host port for additional USB ports.
The hub works without any problems in Linux kernel, but causes u-boot to
restart when the TUSB8041 is probed during usb start.
We are working with the 4.03.00.05 TI SDK which uses u-boot 2017.01 as the
base code. We can run "usb start" in uboot if we leave the TUSB8041
disabled.
Not useful though as we cannot communicate with any of our product ports because they are on the hub.
usb start fails whenever the hub is enabled:
=> usb start starting USB... USB0: Register 2000140 NbrPorts 2 Starting the controller USB XHCI 1.00 scanning bus 0 for devices... ERROR: Configure Endpoint command returned
completion code 8.
Failed to configure xHCI endpoint failed to set default configuration len 25, status 80000000 BUG: failure at drivers/usb/host/xhci.c:503/_xhci_alloc_device()! BUG! resetting ...
We are using the hub with all default settings except PWRCTL polarity is
active high and disable the custom battery charging feature. We configure and enable the hub via I2C in board.c of uboot, here is an example of the code we use:
To configure TUSB8041:
palmas_i2c_write_u8(TUSB8041_HUB_1, 0xA, 0x20);
Exit TUSB8041 configuration mode and activate:
palmas_i2c_write_u8(TUSB8041_HUB_1, 0xF8, 0x1);
and uboot resets when usb start is requested.
No issues if the hub is not activated by commenting out the i2c initialization
code in board.c:
=> usb start starting USB... USB0: Register 2000140 NbrPorts 2 Starting the controller USB XHCI 1.00 scanning bus 0 for devices... 1 USB Device(s) found scanning usb for storage devices... 0 Storage Device(s) found
=> usb tree USB device tree: 1 Hub (5 Gb/s, 0mA) U-Boot XHCI Host Controller
Any help with this would be appreciated. Thanks
What USB devices are connected behind this hub on your board?
There are no devices connected to this hub or on the board. Only the
TUSB8041 hub.
You mentioned "Not useful though as we cannot communicate with any of our product ports because they are on the hub."
The hub is used to provide the USB ports on the product. The AM5728 only has 2 USB host ports so we use the TUSB8041 to provide additional ports on the product.
u-boot crashes with just the TUSB8041 connected so it makes no sense to connect any other devices for u-boot testing until this is fixed.
Everything works fine with the Linux kernel running, the problem is isolated to u-boot.
So if there are no devices connected to this hub, what is this hub for?
Regards, Bin