linux-kernel - Re: [PATCH] usb: gadget: aspeed: Fix probe regression

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Date:   Mon, 17 Oct 2022 13:40:27 -0700
From:   Zev Weiss <zev@...ilderbeest.net>
To:     Joel Stanley <joel@....id.au>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Andrew Jeffery <andrew@...id.au>, linux-usb@...r.kernel.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Jae Hyun Yoo <quic_jaehyoo@...cinc.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH] usb: gadget: aspeed: Fix probe regression

On Sun, Oct 16, 2022 at 10:30:06PM PDT, Joel Stanley wrote:
>Since commit fc274c1e9973 ("USB: gadget: Add a new bus for gadgets"),
>the gadget devices are proper driver core devices, which caused each
>device to request pinmux settings:
>
> aspeed_vhub 1e6a0000.usb-vhub: Initialized virtual hub in USB2 mode
> aspeed-g5-pinctrl 1e6e2080.pinctrl: pin A7 already requested by 1e6a0000.usb-vhub; cannot claim for gadget.0
> aspeed-g5-pinctrl 1e6e2080.pinctrl: pin-232 (gadget.0) status -22
> aspeed-g5-pinctrl 1e6e2080.pinctrl: could not request pin 232 (A7) from group USB2AD  on device aspeed-g5-pinctrl
> g_mass_storage gadget.0: Error applying setting, reverse things back
>
>The vhub driver has already claimed the pins, so prevent the gadgets
>from requesting them too by setting the magic of_node_reused flag. This
>causes the driver core to skip the mux request.
>
>Reported-by: Zev Weiss <zev@...ilderbeest.net>
>Reported-by: Jae Hyun Yoo <quic_jaehyoo@...cinc.com>
>Fixes: fc274c1e9973 ("USB: gadget: Add a new bus for gadgets")
>Cc: stable@...r.kernel.org
>Signed-off-by: Joel Stanley <joel@....id.au>

Thanks Joel!

Tested-by: Zev Weiss <zev@...ilderbeest.net>