linux-kernel - [PATCH v4] phy: rockchip-inno-usb2: Return zero after otg sync

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Message-Id: <20220902184543.1234835-1-pgwipeout@gmail.com>
Date:   Fri,  2 Sep 2022 14:45:42 -0400
From:   Peter Geis <pgwipeout@...il.com>
To:     Heiko Stuebner <heiko@...ech.de>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Samuel Holland <samuel@...lland.org>,
        Peter Geis <pgwipeout@...il.com>
Cc:     Markus Reichl <m.reichl@...etechno.de>,
        Michael Riesch <michael.riesch@...fvision.net>,
        linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4] phy: rockchip-inno-usb2: Return zero after otg sync

The otg sync state patch reuses the ret variable, but fails to set it to
zero after use. This leads to a situation when the otg port is in
peripheral mode where the otg phy aborts halfway through setup.  It also
fails to account for a failure to register the extcon notifier. Fix this
by using our own variable and skipping otg sync in case of failure.

Fixes: 8dc60f8da22f ("phy: rockchip-inno-usb2: Sync initial otg state")
Reported-by: Markus Reichl <m.reichl@...etechno.de>
Reported-by: Michael Riesch <michael.riesch@...fvision.net>
Signed-off-by: Peter Geis <pgwipeout@...il.com>
Tested-by: Michael Riesch <michael.riesch@...fvision.net>
Tested-by: Markus Reichl <m.reichl@...etechno.de>
---
Changelog:
v4
- fix a checkpatch style error (thanks Vinod)
v3
- add missing brackets around new goto
v2
- switch to using our own variable
- add missing goto to skip sync in case of registration failure
---
 drivers/phy/rockchip/phy-rockchip-inno-usb2.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
index 0b1e9337ee8e..e6ededc51523 100644
--- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
@@ -1124,7 +1124,7 @@ static int rockchip_usb2phy_otg_port_init(struct rockchip_usb2phy *rphy,
 					  struct rockchip_usb2phy_port *rport,
 					  struct device_node *child_np)
 {
-	int ret;
+	int ret, id;
 
 	rport->port_id = USB2PHY_PORT_OTG;
 	rport->port_cfg = &rphy->phy_cfg->port_cfgs[USB2PHY_PORT_OTG];
@@ -1162,13 +1162,15 @@ static int rockchip_usb2phy_otg_port_init(struct rockchip_usb2phy *rphy,
 
 		ret = devm_extcon_register_notifier(rphy->dev, rphy->edev,
 					EXTCON_USB_HOST, &rport->event_nb);
-		if (ret)
+		if (ret) {
 			dev_err(rphy->dev, "register USB HOST notifier failed\n");
+			goto out;
+		}
 
 		if (!of_property_read_bool(rphy->dev->of_node, "extcon")) {
 			/* do initial sync of usb state */
-			ret = property_enabled(rphy->grf, &rport->port_cfg->utmi_id);
-			extcon_set_state_sync(rphy->edev, EXTCON_USB_HOST, !ret);
+			id = property_enabled(rphy->grf, &rport->port_cfg->utmi_id);
+			extcon_set_state_sync(rphy->edev, EXTCON_USB_HOST, !id);
 		}
 	}
 
-- 
2.25.1