From: Tejas Joglekar <Tejas.Joglekar@synopsys.com>
To: "H. Nikolaus Schaller" <hns@goldelico.com>,
Tejas Joglekar <Tejas.Joglekar@synopsys.com>,
Felipe Balbi <balbi@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Discussions about the Letux Kernel"
<letux-kernel@openphoenux.org>,
"kernel@pyra-handheld.com" <kernel@pyra-handheld.com>,
Linux-OMAP <linux-omap@vger.kernel.org>
Subject: Re: [BUG]: usb: dwc3: gadget: broken on OMAP5432
Date: Wed, 8 Jan 2020 09:06:34 +0000 [thread overview]
Message-ID: <7daf64ba-7efb-e2f1-a449-f5f3791a3c8e@synopsys.com> (raw)
In-Reply-To: <703DD239-8E3B-405C-A531-FF7DEEED38DC@goldelico.com>
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
next prev parent reply other threads:[~2020-01-08 9:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-08 8:59 [BUG]: usb: dwc3: gadget: broken on OMAP5432 H. Nikolaus Schaller
2020-01-08 9:06 ` Tejas Joglekar [this message]
2020-01-08 14:02 ` H. Nikolaus Schaller
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