linux-kernel - [PATCH v1] usb: typec: tcpm: delay SNK_TRY_WAIT_DEBOUNCE to SRC

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Message-ID: <20250429234703.3748506-2-rdbabiera@google.com>
Date: Tue, 29 Apr 2025 23:47:01 +0000
From: RD Babiera <rdbabiera@...gle.com>
Cc: heikki.krogerus@...ux.intel.com, badhri@...gle.com, 
	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org, RD Babiera <rdbabiera@...gle.com>, stable@...r.kernel.org
Subject: [PATCH v1] usb: typec: tcpm: delay SNK_TRY_WAIT_DEBOUNCE to
 SRC_TRYWAIT transition

This patch fixes Type-C Compliance Test TD 4.7.6 - Try.SNK DRP Connect
SNKAS.

The compliance tester moves into SNK_UNATTACHED during toggling and
expects the PUT to apply Rp after tPDDebounce of detection. If the port
is in SNK_TRY_WAIT_DEBOUNCE, it will move into SRC_TRYWAIT immediately
and apply Rp. This violates TD 4.7.5.V.3, where the tester confirms that
the PUT attaches Rp after the transitions to Unattached.SNK for
tPDDebounce.

Change the tcpm_set_state delay between SNK_TRY_WAIT_DEBOUNCE and
SRC_TRYWAIT to tPDDebounce.

Fixes: a0a3e04e6b2c ("staging: typec: tcpm: Check for Rp for tPDDebounce")
Cc: stable@...r.kernel.org
Signed-off-by: RD Babiera <rdbabiera@...gle.com>
Reviewed-by: Badhri Jagan Sridharan <badhri@...gle.com>
---
 drivers/usb/typec/tcpm/tcpm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 784fa23102f9..87d56ac4565d 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -6003,7 +6003,7 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
 	case SNK_TRY_WAIT_DEBOUNCE:
 		if (!tcpm_port_is_sink(port)) {
 			port->max_wait = 0;
-			tcpm_set_state(port, SRC_TRYWAIT, 0);
+			tcpm_set_state(port, SRC_TRYWAIT, PD_T_PD_DEBOUNCE);
 		}
 		break;
 	case SRC_TRY_WAIT:

base-commit: 615dca38c2eae55aff80050275931c87a812b48c
-- 
2.49.0.967.g6a0df3ecc3-goog