linux-kernel - [PATCH] usb: typec: tcpm: Use configured PD revision for negotiation

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Message-ID: <20250508174756.1300942-1-chou.cosmo@gmail.com>
Date: Fri,  9 May 2025 01:47:56 +0800
From: Cosmo Chou <chou.cosmo@...il.com>
To: badhri@...gle.com,
	heikki.krogerus@...ux.intel.com,
	gregkh@...uxfoundation.org
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	chou.cosmo@...il.com,
	cosmo.chou@...ntatw.com
Subject: [PATCH] usb: typec: tcpm: Use configured PD revision for negotiation

Initialize negotiated_rev and negotiated_rev_prime based on the port's
configured PD revision (rev_major) rather than always defaulting to
PD_MAX_REV. This ensures ports start PD communication using their
appropriate revision level.

This allows proper communication with devices that require specific
PD revision levels, especially for the hardware designed for PD 1.0
or 2.0 specifications.

Signed-off-by: Cosmo Chou <chou.cosmo@...il.com>
---
 drivers/usb/typec/tcpm/tcpm.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index a99db4e025cd..5a58c21c4d14 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -4782,8 +4782,13 @@ static void run_state_machine(struct tcpm_port *port)
 		typec_set_pwr_opmode(port->typec_port, opmode);
 		port->pwr_opmode = TYPEC_PWR_MODE_USB;
 		port->caps_count = 0;
-		port->negotiated_rev = PD_MAX_REV;
-		port->negotiated_rev_prime = PD_MAX_REV;
+		if (port->pd_rev.rev_major > 0 && port->pd_rev.rev_major <= PD_MAX_REV + 1) {
+			port->negotiated_rev = port->pd_rev.rev_major - 1;
+			port->negotiated_rev_prime = port->pd_rev.rev_major - 1;
+		} else {
+			port->negotiated_rev = PD_MAX_REV;
+			port->negotiated_rev_prime = PD_MAX_REV;
+		}
 		port->message_id = 0;
 		port->message_id_prime = 0;
 		port->rx_msgid = -1;
@@ -5048,8 +5053,13 @@ static void run_state_machine(struct tcpm_port *port)
 					      port->cc2 : port->cc1);
 		typec_set_pwr_opmode(port->typec_port, opmode);
 		port->pwr_opmode = TYPEC_PWR_MODE_USB;
-		port->negotiated_rev = PD_MAX_REV;
-		port->negotiated_rev_prime = PD_MAX_REV;
+		if (port->pd_rev.rev_major > 0 && port->pd_rev.rev_major <= PD_MAX_REV + 1) {
+			port->negotiated_rev = port->pd_rev.rev_major - 1;
+			port->negotiated_rev_prime = port->pd_rev.rev_major - 1;
+		} else {
+			port->negotiated_rev = PD_MAX_REV;
+			port->negotiated_rev_prime = PD_MAX_REV;
+		}
 		port->message_id = 0;
 		port->message_id_prime = 0;
 		port->rx_msgid = -1;
-- 
2.43.0