linux-kernel - [PATCH 1/3] usb: typec: Add retimer handle to port altmode

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Message-Id: <20230112221609.540754-2-pmalani@chromium.org>
Date:   Thu, 12 Jan 2023 22:16:06 +0000
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     bleung@...omium.org, heikki.krogerus@...ux.intel.com,
        Prashant Malani <pmalani@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 1/3] usb: typec: Add retimer handle to port altmode

Just like it does with muxes, the Type-C bus code can update the state
of connected retimers (especially when altmode-related transitions
occur). Add a retimer handle to the port altmode struct to enable this.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/usb/typec/bus.h   |  2 ++
 drivers/usb/typec/class.c | 15 +++++++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/typec/bus.h b/drivers/usb/typec/bus.h
index 56dec268d4dd..c89168857417 100644
--- a/drivers/usb/typec/bus.h
+++ b/drivers/usb/typec/bus.h
@@ -7,11 +7,13 @@
 
 struct bus_type;
 struct typec_mux;
+struct typec_retimer;
 
 struct altmode {
 	unsigned int			id;
 	struct typec_altmode		adev;
 	struct typec_mux		*mux;
+	struct typec_retimer		*retimer;
 
 	enum typec_port_data		roles;
 
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 5897905cb4f0..ed3d070b1ca4 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -583,6 +583,7 @@ void typec_unregister_altmode(struct typec_altmode *adev)
 {
 	if (IS_ERR_OR_NULL(adev))
 		return;
+	typec_retimer_put(to_altmode(adev)->retimer);
 	typec_mux_put(to_altmode(adev)->mux);
 	device_unregister(&adev->dev);
 }
@@ -2108,16 +2109,26 @@ typec_port_register_altmode(struct typec_port *port,
 {
 	struct typec_altmode *adev;
 	struct typec_mux *mux;
+	struct typec_retimer *retimer;
 
 	mux = typec_mux_get(&port->dev, desc);
 	if (IS_ERR(mux))
 		return ERR_CAST(mux);
 
+	retimer = typec_retimer_get(&port->dev);
+	if (IS_ERR(retimer)) {
+		typec_mux_put(mux);
+		return ERR_CAST(retimer);
+	}
+
 	adev = typec_register_altmode(&port->dev, desc);
-	if (IS_ERR(adev))
+	if (IS_ERR(adev)) {
+		typec_retimer_put(retimer);
 		typec_mux_put(mux);
-	else
+	} else {
 		to_altmode(adev)->mux = mux;
+		to_altmode(adev)->retimer = retimer;
+	}
 
 	return adev;
 }
-- 
2.39.0.314.g84b9a713c41-goog