linux-kernel - [PATCH 1/3] usb: typec: ps883x: fix registration race

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Message-ID: <20250218152933.22992-2-johan+linaro@kernel.org>
Date: Tue, 18 Feb 2025 16:29:31 +0100
From: Johan Hovold <johan+linaro@...nel.org>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Abel Vesa <abel.vesa@...aro.org>,
	Stephan Gerhold <stephan.gerhold@...aro.org>,
	linux-arm-msm@...r.kernel.org,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH 1/3] usb: typec: ps883x: fix registration race

Make sure that the retimer is fully setup before registering it to avoid
having consumers try to access it while it is being reset.

Fixes: 257a087c8b52 ("usb: typec: Add support for Parade PS8830 Type-C Retimer")
Cc: Abel Vesa <abel.vesa@...aro.org>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/usb/typec/mux/ps883x.c | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/usb/typec/mux/ps883x.c b/drivers/usb/typec/mux/ps883x.c
index ef086989231f..274de7abe585 100644
--- a/drivers/usb/typec/mux/ps883x.c
+++ b/drivers/usb/typec/mux/ps883x.c
@@ -346,6 +346,22 @@ static int ps883x_retimer_probe(struct i2c_client *client)
 		goto err_vregs_disable;
 	}
 
+	/* skip resetting if already configured */
+	if (regmap_test_bits(retimer->regmap, REG_USB_PORT_CONN_STATUS_0,
+			     CONN_STATUS_0_CONNECTION_PRESENT) == 1) {
+		gpiod_direction_output(retimer->reset_gpio, 0);
+	} else {
+		gpiod_direction_output(retimer->reset_gpio, 1);
+
+		/* VDD IO supply enable to reset release delay */
+		usleep_range(4000, 14000);
+
+		gpiod_set_value(retimer->reset_gpio, 0);
+
+		/* firmware initialization delay */
+		msleep(60);
+	}
+
 	sw_desc.drvdata = retimer;
 	sw_desc.fwnode = dev_fwnode(dev);
 	sw_desc.set = ps883x_sw_set;
@@ -368,21 +384,6 @@ static int ps883x_retimer_probe(struct i2c_client *client)
 		goto err_switch_unregister;
 	}
 
-	/* skip resetting if already configured */
-	if (regmap_test_bits(retimer->regmap, REG_USB_PORT_CONN_STATUS_0,
-			     CONN_STATUS_0_CONNECTION_PRESENT) == 1)
-		return gpiod_direction_output(retimer->reset_gpio, 0);
-
-	gpiod_direction_output(retimer->reset_gpio, 1);
-
-	/* VDD IO supply enable to reset release delay */
-	usleep_range(4000, 14000);
-
-	gpiod_set_value(retimer->reset_gpio, 0);
-
-	/* firmware initialization delay */
-	msleep(60);
-
 	return 0;
 
 err_switch_unregister:
-- 
2.45.3