Hi,
Jim Lin <jilin@xxxxxxxxxx> writes:
> On 2016年04月25日 20:01, Felipe Balbi wrote:
>>>> Is this happening on set_config() ? If that's the case, why is
>>>> gadget->speed set to USB_SPEED_SUPER to start with ? Your controller
>>>> should already have negotiated highspeed which means
>>>> function_descriptors() should have returned highspeed descriptors, not a
>>>> NULL superspeed.
>>>>
>>>> Care to explain why you haven't negotiated Highspeed ? The only thing I
>>>> can think of is that you're using a Superspeed-capable peripheral
>>>> controller (dwc3?) with maximum-speed set to Superspeed, with a
>>>> Superspeed-capable cable connected to an XHCI PC, but loading a
>>>> high-speed gadget driver (which you got from Android, written with f_fs)
>>>> and this gadget doesn't tell composite that its maximum speed is
>>>> Highspeed, instead of super-speed.
>>>>
>>>> We can add a check, sure, to avoid a kernel oops; however, you should
>>>> really fix up the gadget implementation and/or set dwc3's maximum-speed
>>>> property accordingly.
>>>>
>>>> Can you check if this patch makes your scenario work while still being
>>>> fully functional ?
>>>>
>>>> diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
>>>> index de9ffd60fcfa..3d3cdc5ed20d 100644
>>>> --- a/drivers/usb/gadget/composite.c
>>>> +++ b/drivers/usb/gadget/composite.c
>>>> @@ -66,20 +66,36 @@ function_descriptors(struct usb_function *f,
>>>> {
>>>> struct usb_descriptor_header **descriptors;
>>>>
>>>> + /*
>>>> + * NOTE: we try to help gadget drivers which might not be setting
>>>> + * max_speed appropriately.
>>>> + */
>>>> +
>>>> switch (speed) {
>>>> case USB_SPEED_SUPER_PLUS:
>>>> descriptors = f->ssp_descriptors;
>>>> - break;
>>>> + if (descriptors)
>>>> + break;
>>>> + /* FALLTHROUGH */
>>>> case USB_SPEED_SUPER:
>>>> descriptors = f->ss_descriptors;
>>>> - break;
>>>> + if (descriptors)
>>>> + break;
>>>> + /* FALLTHROUGH */
>>>> case USB_SPEED_HIGH:
>>>> descriptors = f->hs_descriptors;
>>>> - break;
>>>> + if (descriptors)
>>>> + break;
>>>> + /* FALLTHROUGH */
>>>> default:
>>>> descriptors = f->fs_descriptors;
>>>> }
>>>>
>>>> + /*
>>>> + * if we can't find any descriptors at all, then this gadget deserves to
>>>> + * Oops with a NULL pointer dereference
>>>> + */
>>>> +
>>>> return descriptors;
>>>> }
>>>>
>>> After trying your change, no kernel panic, but SuperSpeed device (device
>>> mode) is not enumerated by ubuntu 14.04 USB 3.0 host controller as MTP
>>> device with USB3.0 cable.
>> what do you get on dmesg on host side ? Are you running dwc3 ? If you
>> are, please capture trace logs of the failure:
>>
>> # mount -t debugfs none /sys/kernel/debug
>> # cd /sys/kernel/debug/tracing
>> # echo 2048 > buffer_size_kb
>> # echo 1 > events/dwc3/enable
>>
>> (now connect your cable to host pc)
>>
>> # cp trace /path/to/non-volatile/storage/trace.txt
>>
>> Please reply with this trace.txt file and dmesg from host side.
> This is not running with dwc3.
okay
> dmesg from PC host side (after adding your change without my patch):
>
> [17907.984647] usb 6-2: new SuperSpeed USB device number 54 using xhci_hcd
> [17908.012036] usb 6-2: No SuperSpeed endpoint companion for config 1
> interface 1 altsetting 0 ep 2: using minimum values
> [17908.012040] usb 6-2: No SuperSpeed endpoint companion for config 1
> interface 1 altsetting 0 ep 131: using minimum values
> [17908.013652] usb 6-2: New USB device found, idVendor=xxxx, idProduct=xxxx
> [17908.013656] usb 6-2: New USB device strings: Mfr=1, Product=2,
> SerialNumber=3
> [17908.013658] usb 6-2: Product: xxxxxxx
> [17908.013661] usb 6-2: Manufacturer: xxxxxx
> [17908.013664] usb 6-2: SerialNumber: 1234567890
> [17908.014680] xhci_hcd 0000:05:00.0: ERROR: unexpected command
> completion code 0x11.
hmmm... completed with unknown code ? Odd. Mathias, any idea what this
is ?
> [17908.014690] usb 6-2: can't set config #1, error -22
>
> I also attach git log of system/core/adb/usb_linux_client.cpp of Android
> N for your reference.
> "
> Author: Badhri Jagan Sridharan <Badhri@xxxxxxxxxx>
> Date: Mon Oct 5 13:04:03 2015 -0700
>
> adbd: Add os descriptor support for adb.
>
> Eventhough windows does not rely on extended os
> descriptor for adbd, when android usb device is
> configures as a composite device such as mtp+adb,
> windows discards the extended os descriptor even
> if one of the USB function fails to send
> the extended compat descriptor. This results in automatic
> install of MTP driverto fail when Android device is in
> "File Transfer" mode with adb enabled.
>
> https://msdn.microsoft.com/en-us/library/windows/hardware/gg463179.aspx
> "
Okay, cool. Can you check that you're limitting your controller's speed
to high-speed ?
--
balbi
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