linux-kernel - Re: [PATCH v1] usb: handle warm-reset port requests on hub

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Message-ID: <e684e8d7-6fc9-3331-868c-6cc4122f2cef@loongson.cn>
Date:   Wed, 11 Jan 2023 11:32:01 +0800
From:   yangyinglu <yangyinglu@...ngson.cn>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Douglas Anderson <dianders@...omium.org>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Bhuvanesh Surachari <Bhuvanesh_Surachari@...tor.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Ray Chi <raychi@...gle.com>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yinbo Zhu <zhuyinbo@...ngson.cn>, yangyinglu@...ngson.cn
Subject: Re: [PATCH v1] usb: handle warm-reset port requests on hub_init



在 2023/1/11 上午10:33, Kai-Heng Feng 写道:
> Hi yangyinglu,
> 
> On Tue, Jan 10, 2023 at 4:20 PM yangyinglu <yangyinglu@...ngson.cn> wrote:
>>
>> USB-C storage device not detected on USB 3.0 host when
>> plugged in after boot, so need to warm-reset port
> 
> Is it possible to enable USB dyndbg, plug a USB 3.0 device, then paste
> the relevant dmesg here? Thanks!
> 
> Kai-Heng

  hi,
     After entering the system, directly plug and unplug the USB flash 
disk. usb control is  etron Technology Inc.The log is as follows:
  [   10.354484] radeon 0000:04:00.0: vgaarb: changed VGA decodes: 
olddecodes=io+mem,decodes=none:owns=none
  [   10.484794] bridge: filtering via arp/ip/ip6tables is no longer 
available by default. Update your scripts to load br_netfilter if you 
need this.
  [   10.506968] tun: Universal TUN/TAP device driver, 1.6
  [   10.514128] virbr0: port 1(virbr0-nic) entered blocking state
  [   10.519858] virbr0: port 1(virbr0-nic) entered disabled state
  [   10.525646] device virbr0-nic entered promiscuous mode
  [   10.666536] virbr0: port 1(virbr0-nic) entered blocking state
  [   10.672268] virbr0: port 1(virbr0-nic) entered listening state
  [   10.748564] virbr0: port 1(virbr0-nic) entered disabled state

  Loongnix GNU/Linux 20 Release 3 loongson-pc ttyS0


  loongson-pc login: [  147.701011] usb usb4-port1: Cannot enable. Maybe 
the USB cable is bad?
  [  151.793206] usb usb4-port1: Cannot enable. Maybe the USB cable is bad?
  [  151.799726] usb usb4-port1: attempt power cycle
  [  157.465465] usb usb4-port1: Cannot enable. Maybe the USB cable is bad?
  [  161.557649] usb usb4-port1: Cannot enable. Maybe the USB cable is bad?
  [  161.564167] usb usb4-port1: unable to enumerate USB device
  [  165.641834] usb usb4-port1: Cannot enable. Maybe the USB cable is bad?

> 
>>
>> Signed-off-by: yangyinglu <yangyinglu@...ngson.cn>
>> ---
>>   drivers/usb/core/hub.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
>> index 77e73fc8d673..bd4496b80c2d 100644
>> --- a/drivers/usb/core/hub.c
>> +++ b/drivers/usb/core/hub.c
>> @@ -1159,7 +1159,7 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
>>                  }
>>
>>                  /* Make sure a warm-reset request is handled by port_event */
>> -               if (type == HUB_RESUME &&
>> +               if ((type == HUB_RESUME || type == HUB_INIT2) &&
>>                      hub_port_warm_reset_required(hub, port1, portstatus))
>>                          set_bit(port1, hub->event_bits);
>>
>> --
>> 2.20.1
>>