linux-kernel - [PATCH AUTOSEL 4.19 76/87] USB: typec: tcpm: Add a 30ms room for tPSSourceOn in PR

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 22 Dec 2020 21:20:52 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kyle Tso <kyletso@...gle.com>, Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Badhri Jagan Sridharan <badhri@...gle.com>,
        Will McVicker <willmcvicker@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 76/87] USB: typec: tcpm: Add a 30ms room for tPSSourceOn in PR_SWAP

From: Kyle Tso <kyletso@...gle.com>

[ Upstream commit fe79d5de77204dd946cfad76a9bec23354b1a500 ]

TCPM state machine needs 20-25ms to enter the ErrorRecovery state after
tPSSourceOn timer timeouts. Change the timer from max 480ms to 450ms to
ensure that the timer complies with the Spec. In order to keep the
flexibility for other usecases using tPSSourceOn, add another timer only
for PR_SWAP.

Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc: Badhri Jagan Sridharan <badhri@...gle.com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Kyle Tso <kyletso@...gle.com>
Signed-off-by: Will McVicker <willmcvicker@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Link: https://lore.kernel.org/r/20201210160521.3417426-5-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/typec/tcpm.c | 2 +-
 include/linux/usb/pd.h   | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
index 9c901e3b17472..95e4725eaf3f7 100644
--- a/drivers/usb/typec/tcpm.c
+++ b/drivers/usb/typec/tcpm.c
@@ -3455,7 +3455,7 @@ static void run_state_machine(struct tcpm_port *port)
 			tcpm_set_state(port, ERROR_RECOVERY, 0);
 			break;
 		}
-		tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON);
+		tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON_PRS);
 		break;
 	case PR_SWAP_SRC_SNK_SINK_ON:
 		tcpm_set_state(port, SNK_STARTUP, 0);
diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h
index bdf4c88d2aa0a..1a29a7351fbed 100644
--- a/include/linux/usb/pd.h
+++ b/include/linux/usb/pd.h
@@ -441,6 +441,7 @@ static inline unsigned int rdo_max_power(u32 rdo)
 #define PD_T_DRP_SRC		30
 #define PD_T_PS_SOURCE_OFF	920
 #define PD_T_PS_SOURCE_ON	480
+#define PD_T_PS_SOURCE_ON_PRS	450	/* 390 - 480ms */
 #define PD_T_PS_HARD_RESET	30
 #define PD_T_SRC_RECOVER	760
 #define PD_T_SRC_RECOVER_MAX	1000
-- 
2.27.0