linux-kernel - Re: [BUG]: usb: dwc3: gadget: broken on OMAP5432

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Message-ID: <7daf64ba-7efb-e2f1-a449-f5f3791a3c8e@synopsys.com>
Date:   Wed, 8 Jan 2020 09:06:34 +0000
From:   Tejas Joglekar <Tejas.Joglekar@...opsys.com>
To:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Tejas Joglekar <Tejas.Joglekar@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        "Discussions about the Letux Kernel" <letux-kernel@...nphoenux.org>,
        "kernel@...a-handheld.com" <kernel@...a-handheld.com>,
        Linux-OMAP <linux-omap@...r.kernel.org>
Subject: Re: [BUG]: usb: dwc3: gadget: broken on OMAP5432

Hi,
On 1/8/2020 2:29 PM, H. Nikolaus Schaller wrote:
> Hi,
> I noticed that the usb ethernet gadget driver is broken since v5.5-rc2
> and 5.4.4, but only for our OMAP5 board. Our OMAP3 boards work with
> the same tree, kernel binary and user-space (Debian Stretch).
> 
> The symptom is that I can see the interface on the host PC being
> enumerated and IP addresses etc. are set up. But a ping in either
> direction fails/times out.
> 
> After inspecting diffs I found some changes in dwc3:gadget
> and indeed omap3/twl4030 uses musb and omap5 uses dwc3.
> 
> Reverting
> 
> a7f7e61270f1 ("usb: dwc3: gadget: Fix logical condition");
> 
> on v5.5-rc makes it work again.
> 
> BTW: v4.19.90 works although it includes this logical condition fix.
> So the real difference between v4.19 and v5.5 may be elsewhere in
> newer kernels and only be revealed by the patch.
> 
> If important: my setup is running with USB2 cable and speed
> only.
> 
> So please check this and other recent dwc3 patches for introducing
> a stall of communication.
> 
Another gadget driver issue was reported by Thinh after my fix, and he has submitted a patch for the same. You can refer the discussion https://patchwork.kernel.org/patch/11292087/.
Can you check if that patch works for you ?

> BR and thanks,
> Nikolaus Schaller
> 
> 

Thanks & Regards,
 Tejas Joglekar