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

[Neil Armstrong]

Hi Bin,

Le 07/09/2019 à 05:44, Bin Meng a écrit :
> 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?

Yes, Linux works fine, is it worth tracing the Linux XHCI driver aswell ?

Neil


> 
> Regards,
> Bin
>