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From:   Luke Lu <luke.lu@libre.computer>
To:     Neil Armstrong <neil.armstrong@linaro.org>,
        linux-usb@vger.kernel.org, linux-amlogic@lists.infradead.org
Cc:     Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Kevin Hilman <khilman@baylibre.com>,
        Jerome Brunet <jbrunet@baylibre.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Da Xue <da@libre.computer>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Luke Lu <luke.lu@libre.computer>
Subject: [PATCH] usb: dwc3: meson-g12a: do post init to fix broken usb after resumption
Date:   Tue,  8 Aug 2023 03:25:10 +0000
Message-Id: <20230808032510.31754-1-luke.lu@libre.computer>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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@libre.computer>
---
 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;
 }
 
-- 
2.40.1