[U-Boot] [usb dwc3] xHCI driver -- a hint needed.

[Bin Meng]

Hi Neil,

On Thu, Sep 5, 2019 at 11:48 PM Neil Armstrong <narmstrong at baylibre.com> wrote:
>
> Hi Bin,
>
> I've been having the same behavior on the Amlogic S905X SoC with a DWC3 XHCI controller
> connected to 2 HS-only PHYs and no SS PHY.
>
> When a device is connected on the second PHY, I have the same BUG(),
> but no more when a device is also connected on the first PHY, and no issues
> at all on the first PHY.
>
> XHCI timeout on event type 33... cannot recover.
>
> What kind of debug output would you need to debug this ?
>
> => When Port 1 is disconnected, but Port 2 is populated:
> usb_control_msg: request: 0x1, requesttype: 0x23, value 0x10 index 0x2 length 0x0
> clear port connect change, actual port 2 status  = 0x6e1
> ...
> usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x2 length 0x0
> ...
> usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x2 length 0x4
> SPEED = FULLSPEED
> ...
> usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x2 length 0x0
> ...
> usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x2 length 0x4
> SPEED = FULLSPEED
> ...
> usb_control_msg: request: 0x1, requesttype: 0x23, value 0x14 index 0x2 length 0x0
> clear port reset change, actual port 2 status  = 0x603
>
>
> => When Port 1 is populated:
> usb_control_msg: request: 0x1, requesttype: 0x23, value 0x10 index 0x2 length 0x0
> clear port connect change, actual port 2 status  = 0x6e1
> ...
> usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x2 length 0x0
> ...
> usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x2 length 0x4
> SPEED = FULLSPEED
> ...
> usb_control_msg: request: 0x3, requesttype: 0x23, value 0x4 index 0x2 length 0x0
> ...
> usb_control_msg: request: 0x0, requesttype: 0xA3, value 0x0 index 0x2 length 0x4
> SPEED = HIGHSPEED
> ...
> usb_control_msg: request: 0x1, requesttype: 0x23, value 0x14 index 0x2 length 0x0
> clear port reset change, actual port 2 status  = 0xe03
>
> When Port 1 is populated, Port 2 status correctly switches to HIGHSPEED,
> but why ?
>

This looks really strange. Sounds like a hardware internal state
depends on the first USB port. Do you know if Linux works?

Regards,
Bin