linux-kernel - Re: [PATCH v2] usb: dwc3: meson-g12a: do post init to fix broken usb after resumption

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Message-ID: <4de07b08-5eda-86d7-8925-f2fadbfca407@linaro.org>
Date:   Mon, 14 Aug 2023 09:41:53 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Luke Lu <luke.lu@...re.computer>, linux-usb@...r.kernel.org,
        linux-amlogic@...ts.infradead.org
Cc:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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,
        stable@...r.kernel.org
Subject: Re: [PATCH v2] usb: dwc3: meson-g12a: do post init to fix broken usb
 after resumption

On 09/08/2023 23:29, 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.
> 
> Cc: stable@...r.kernel.org # v5.8+
> Fixes: c99993376f72 ("usb: dwc3: Add Amlogic G12A DWC3 glue")
> Signed-off-by: Luke Lu <luke.lu@...re.computer>
> 
> ---
> Note here, the commmit of Fixes tag is the first patch which bring
> suspend/resume function, so let's use it as the fix tag.
> 
> As commit 5b0ba0caaf3a: (usb: dwc3: meson-g12a: refactor usb init)"
> introduced the use_post_init() function, and this patch will explicitly
> depend on it, so let's set kernel version higher or equal to v5.8.
> 
> Changes since v1:
>   - add Fixes tag and Cc stable tree
> ---
>   drivers/usb/dwc3/dwc3-meson-g12a.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/dwc3-meson-g12a.c b/drivers/usb/dwc3/dwc3-meson-g12a.c
> index e99c7489dba0..2c07c038b584 100644
> --- a/drivers/usb/dwc3/dwc3-meson-g12a.c
> +++ b/drivers/usb/dwc3/dwc3-meson-g12a.c
> @@ -926,6 +926,12 @@ static int __maybe_unused dwc3_meson_g12a_resume(struct device *dev)
>   			return ret;
>   	}
>   
> +	if (priv->drvdata->usb_post_init) {
> +		ret = priv->drvdata->usb_post_init(priv);
> +		if (ret)
> +			return ret;
> +	}
> +
>   	return 0;
>   }
>   

Acked-by: Neil Armstrong <neil.armstrong@...aro.org>