Date:   Sun, 10 Feb 2019 10:29:44 +0100
From:   Stanislaw Gruszka <sgruszka@redhat.com>
To:     Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Cc:     Stefan Wahren <stefan.wahren@i2se.com>,
        Felix Fietkau <nbd@nbd.name>,
        Doug Anderson <dianders@chromium.org>,
        Minas Harutyunyan <hminas@synopsys.com>,
        linux-wireless <linux-wireless@vger.kernel.org>,
        linux-usb@vger.kernel.org
Subject: Re: [BUG] mt76x0u: Probing issues on Raspberry Pi 3 B+
Message-ID: <20190210092943.GA2913@redhat.com>
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On Sat, Feb 09, 2019 at 07:46:37PM +0100, Lorenzo Bianconi wrote:
> > 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?
> 
> Hi Stefan,
> 
> could you please test the following series:
> https://patchwork.kernel.org/cover/10764453/
> Applying this series I am able to connect to my home AP using an Asus
> USB-AC51 (mt76x0u) connected to a Raspberry Pi 3 B+.
> I am running rpi-5.0.y branch of https://github.com/raspberrypi/linux.git

How the patch series fixed the issue since it was reported before that 
it does not work on 4.19.x which do not use scatter gatter I/O ?

Or it is regression ? 4.19.x driver works with rasperrypi/linux but -next
does not ?

Stanislaw