linux-kernel - Re: [PATCH] usb: dwc3: meson-g12a: do post init to fix broken usb after resumption

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Date:   Tue, 8 Aug 2023 06:09:45 +0000
From:   Luke Lu <luke.lu@...re.computer>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Neil Armstrong <neil.armstrong@...aro.org>,
        linux-usb@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Da Xue <da@...re.computer>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: dwc3: meson-g12a: do post init to fix broken usb
 after resumption

HI Greg:

On Tue, Aug 8, 2023 at 4:56 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Tue, Aug 08, 2023 at 03:25:10AM +0000, Luke Lu wrote:
> > Device connected to usb otg port of GXL-based boards can not be
> > recognised after resumption, doesn't recover even if disconnect and
> > reconnect the device. dmesg shows it disconnects during resumption.
> >
> > [   41.492911] usb 1-2: USB disconnect, device number 3
> > [   41.499346] usb 1-2: unregistering device
> > [   41.511939] usb 1-2: unregistering interface 1-2:1.0
> >
> > Calling usb_post_init() will fix this issue, and it's tested and
> > verified on libretech's aml-s905x-cc board.
> >
> > Signed-off-by: Luke Lu <luke.lu@...re.computer>
>
> What commit id does this fix?
Using "git blame" to explore the history, found dwc3_meson_g12a_resume() was
introduced along with the file of drivers/usb/dwc3/dwc3-meson-g12a.c.
as Da Xue pointed out, the suspend/resume was never tested in GXL based SoC,
so it's broken since the beginning..

For the Fixes tag, I think it's proper to use "5b0ba0caaf3a: (usb:
dwc3: meson-g12a: refactor usb init)"
since the usb_post_init() function was introduced in this commit and
this patch will depend on it.

> Should it also go to stable kernels?
>
Yes, It would be great if the patch can go to stable tree, thanks for
suggesting this
I have it tested on 6.1-lts tree.

Btw, I would wait for a few days for more comments and CC to stable in
next v2 if no objection.

> thanks,
>
> greg k-h

Luke