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 01:33:45 -0400
From:   Da Xue <da@...re.computer>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Luke Lu <luke.lu@...re.computer>,
        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

On Tue, Aug 8, 2023 at 12:56 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?  Should it also go to stable kernels?

Hi Greg,

Suspend device tree flag has not been enabled in-tree for the Amlogic
GXL (S805X/S905X/S905D) series due it having PSCI 0.2 and thus never
untested. Most of the suspend resume code was only tested on newer
G12A/B series.

This and "[PATCH v3] net: phy: meson-gxl: implement
meson_gxl_phy_resume()" fixes USB and Ethernet after resume. HDMI
requires another fix.

It would be great if they could go into stable since we are carrying
these two patches in our tree on 6.1 and they're applicable back to
5.4 but I am not sure what the criteria is.

Best,
Da

>
> thanks,
>
> greg k-h