linux-kernel - [PATCH v2] Revert "usb: typec: tcpm: fix cc role at port reset"

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Message-ID: <20240117114742.2587779-1-badhri@google.com>
Date: Wed, 17 Jan 2024 11:47:42 +0000
From: Badhri Jagan Sridharan <badhri@...gle.com>
To: gregkh@...uxfoundation.org, linux@...ck-us.net, 
	heikki.krogerus@...ux.intel.com
Cc: kyletso@...gle.com, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org, rdbabiera@...gle.com, amitsd@...gle.com, 
	stable@...r.kernel.org, frank.wang@...k-chips.com, 
	Badhri Jagan Sridharan <badhri@...gle.com>
Subject: [PATCH v2] Revert "usb: typec: tcpm: fix cc role at port reset"

This reverts commit 1e35f074399dece73d5df11847d4a0d7a6f49434.

Given that ERROR_RECOVERY calls into PORT_RESET for Hi-Zing
the CC pins, setting CC pins to default state during PORT_RESET
breaks error recovery.

4.5.2.2.2.1 ErrorRecovery State Requirements
The port shall not drive VBUS or VCONN, and shall present a
high-impedance to ground (above zOPEN) on its CC1 and CC2 pins.

Hi-Zing the CC pins is the inteded behavior for PORT_RESET.
CC pins are set to default state after tErrorRecovery in
PORT_RESET_WAIT_OFF.

4.5.2.2.2.2 Exiting From ErrorRecovery State
A Sink shall transition to Unattached.SNK after tErrorRecovery.
A Source shall transition to Unattached.SRC after tErrorRecovery.

Cc: stable@...r.kernel.org
Cc: Frank Wang <frank.wang@...k-chips.com>
Fixes: 1e35f074399d ("usb: typec: tcpm: fix cc role at port reset")
Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
---
 drivers/usb/typec/tcpm/tcpm.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 5945e3a2b0f7..9d410718eaf4 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -4876,8 +4876,7 @@ static void run_state_machine(struct tcpm_port *port)
 		break;
 	case PORT_RESET:
 		tcpm_reset_port(port);
-		tcpm_set_cc(port, tcpm_default_state(port) == SNK_UNATTACHED ?
-			    TYPEC_CC_RD : tcpm_rp_cc(port));
+		tcpm_set_cc(port, TYPEC_CC_OPEN);
 		tcpm_set_state(port, PORT_RESET_WAIT_OFF,
 			       PD_T_ERROR_RECOVERY);
 		break;

base-commit: 933bb7b878ddd0f8c094db45551a7daddf806e00
-- 
2.43.0.429.g432eaa2c6b-goog