Date:   Sat, 9 Feb 2019 13:08:39 +0100 (CET)
From:   Stefan Wahren <stefan.wahren@i2se.com>
To:     Felix Fietkau <nbd@nbd.name>,
        Lorenzo Bianconi <lorenzo.bianconi@redhat.com>,
        Stanislaw Gruszka <sgruszka@redhat.com>,
        Doug Anderson <dianders@chromium.org>,
        Minas Harutyunyan <hminas@synopsys.com>
Cc:     linux-wireless@vger.kernel.org, linux-usb@vger.kernel.org
Message-ID: <2003727085.234456.1549714119945@email.ionos.de>
Subject: [BUG] mt76x0u: Probing issues on Raspberry Pi 3 B+
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Hi,

as already reported here [1], that there are probing issues of mt76 using TP-Link Archer T2UH (wifi USB dongle) on Raspberry Pi 3 B+.

I retested it with recent linux-next 20190208 (aarch64 defconfig + enabling mt76 driver) and got the following output after plugin the wifi dongle:

[   29.778524] usb 1-1.3: new high-speed USB device number 6 using dwc2
[   31.794581] usb 1-1.3: reset high-speed USB device number 6 using dwc2
[   31.919916] mt76x0u 1-1.3:1.0: ASIC revision: 76100002 MAC revision: 76502000
[   32.304412] dwc2 3f980000.usb: dwc2_update_urb_state(): trimming xfer length
[   32.325724] dwc2 3f980000.usb: dwc2_update_urb_state(): trimming xfer length
[   32.346866] dwc2 3f980000.usb: dwc2_update_urb_state(): trimming xfer length
[   33.410559] mt76x0u 1-1.3:1.0: firmware upload timed out
[   33.435458] mt76x0u: probe of 1-1.3:1.0 failed with error -110
[   33.454829] usbcore: registered new interface driver mt76x0u

I took the firmware files from here [2].

Btw there is another issue, if i disconnect the wifi dongle during probe i'm getting a endless flood of the following output:

mt76x0u 1.1.3:1.0: rx urb failed: -71

Any chance to narrow down these issues?

[1] - https://marc.info/?l=linux-wireless&m=154875316703367
[2] - https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/mediatek