From: Matt Corallo <oc2udbzfd@mattcorallo.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-usb@vger.kernel.org, linux-amlogic@lists.infradead.org,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Subject: Re: ODROID-C1/-C2 USB Detection only triggered by some devices
Date: Sun, 27 Jun 2021 21:24:45 -0400 [thread overview]
Message-ID: <0c62655d-738c-4d71-6b7b-fe7fa90b54e3@bluematt.me> (raw)
In-Reply-To: <20210628011628.GC638648@rowland.harvard.edu>
On 6/27/21 21:16, Alan Stern wrote:
> On Sun, Jun 27, 2021 at 09:05:25PM -0400, Matt Corallo wrote:
>>
>>
>> On 6/27/21 20:58, Alan Stern wrote:
>>> On Sun, Jun 27, 2021 at 08:32:21PM -0400, Matt Corallo wrote:
>>>> On an ODROID-C1/C2 device, using the dwc2 driver, only some devices cause USB bus to enumerate devices.
>>>>
>>>> Specifically, both on boot and during normal operation, if some devices are
>>>> plugged in, all USB devices are detected, but if those devices are removed,
>>>> no detection of any devices occurs.
>>>
>>> So if you boot with no devices plugged in, and then you plug in (say) a
>>> flash drive, it doesn't get detected?
>>
>> There is a separate and long-standing bug on the ODROID-C1 and ODROID-C2
>> devices where hotplug doesn't work reliably, which is why I mentioned
>> rebooting. This specific bug all works identically whether booting fresh
>> with the devices or testing hotplug (which sometimes works with lsusb -vvv).
>
> That doesn't answer my question. If no devices are plugged in (either
> at boot or during normal operation), and then you plug in a device like
> a flash drive, does it get detected? What you wrote seems to imply that
> it does not.
That is correct, nothing gets auto-detected after boot. lsusb -vvv *does* cause devices in the second group below to be
reliably detected, and the first group only if at least one of the devices in the second group are present.
>>>> I sadly don't have a lot more to go on, but xdarklight on IRC (I believe ==
>>>> Martin, CC'd) confirmed the findings with a grab bag of USB devices he had
>>>> sitting around as well, and may be able to provide CONFIG_USB_DWC2_DEBUG
>>>> output.
>>>>
>>>> Any further guidance on where to look to debug this issue would be appreciated.
>>>>
>>>> As a sample, some devices which, when plugged in (either alone or together)
>>>> do not cause any USB device detection (see attached lsusb -v files):
>>>>
>>>> Samsung T7 USB 3 drive
>>>> Samsung-Branded Silicon Motion USB 3 Flash Drive
>>>>
>>>> Some devices which, when plugged in cause all USB devices to be detected:
>>>>
>>>> Mushkin-Branded Kingston USB 3 Flash Drive
>>>> Kingston-Branded Kingston USB 2 Flash Drive
>>>> USB-3 MicroSD Card reader (lsusb/testing by xdarklight)
>>>> SanDisk USB 3 Flash Drive (lsusb/testign by xdkarlight)
>>>
>>> This could simply be a question of power. Most of the flash drives and
>>> the card reader probably don't require very much power, whereas some of
>>> them need more. You can this, to some extent, in the MaxPower fields of
>>> the lsusb -v listings.
>>
>> That seems strange, though, given that the first group of devices appear and
>> work totally fine, but only when something from the second group of devices
>> is plugged in. If the second group is not present, then the first group of
>> devices do not appear at all.
>
> You mean that only devices in the first group are affected by this bug?
> Devices in the second group are always detected correctly regardless of
> what else is plugged in? (This contradicts what you wrote above.)
Correct. Ignoring hotplug (ie on fresh boot or lsusb -vvv), the devices in the second group work great. The devices in
the first group do too, but only if a device from the second group is present.
Sorry for the confusion,
Matt
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next prev parent reply other threads:[~2021-06-28 1:24 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-28 0:32 ODROID-C1/-C2 USB Detection only triggered by some devices Matt Corallo
2021-06-28 0:58 ` Alan Stern
2021-06-28 1:05 ` Matt Corallo
2021-06-28 1:16 ` Alan Stern
2021-06-28 1:24 ` Matt Corallo [this message]
2021-06-28 14:24 ` Alan Stern
2021-06-28 18:37 ` Martin Blumenstingl
2021-06-29 15:05 ` Alan Stern
2021-06-29 15:51 ` Martin Blumenstingl
2021-06-29 16:18 ` Alan Stern
2021-06-29 16:30 ` Martin Blumenstingl
2021-06-30 0:35 ` Alan Stern
2021-07-01 10:03 ` Anand Moon
2021-07-01 21:18 ` Martin Blumenstingl
2021-07-02 19:11 ` Anand Moon
2021-07-02 19:33 ` Martin Blumenstingl
[not found] ` <CANAwSgQH6HgFQ+xz15AoKhGUF9G18P-cHOVL2FvS_34FrW=bzQ@mail.gmail.com>
2021-07-13 15:41 ` Martin Blumenstingl
2021-06-30 23:09 ` Martin Blumenstingl
2021-07-10 17:07 ` Martin Blumenstingl
2021-07-11 8:15 ` ODROID-C1/-C2 USB Detection only triggered by some devices dwc2 Minas Harutyunyan
2021-07-11 17:56 ` Martin Blumenstingl
2021-07-12 6:42 ` Minas Harutyunyan
2021-07-12 11:35 ` Martin Blumenstingl
2021-07-14 15:27 ` Minas Harutyunyan
2021-07-14 23:16 ` Martin Blumenstingl
2021-07-15 1:44 ` Alan Stern
2021-07-15 2:04 ` Alan Stern
2021-07-18 21:24 ` Martin Blumenstingl
2021-07-19 14:53 ` Alan Stern
2021-07-19 15:03 ` Alan Stern
2021-07-20 21:55 ` Martin Blumenstingl
2021-07-21 15:58 ` Alan Stern
2021-08-03 20:20 ` Martin Blumenstingl
2021-08-03 21:32 ` Alan Stern
2021-12-12 16:08 ` Martin Blumenstingl
2022-01-10 22:05 ` Martin Blumenstingl
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