From: Guan-Yu Lin <guanyulin@google.com>
To: linux@roeck-us.net, heikki.krogerus@linux.intel.com,
gregkh@linuxfoundation.org
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
badhri@google.com, kyletso@google.com, albertccwang@google.com,
Guan-Yu Lin <guanyulin@google.com>
Subject: [PATCH] usb: typec: tcpm: skip checking port->send_discover in PD3.0
Date: Thu, 16 Nov 2023 16:32:16 +0800 [thread overview]
Message-ID: <20231116083221.1201892-1-guanyulin@google.com> (raw)
The original Collison Avoidance mechanism, port->send_discover, avoids
the conflict when port partners start AMS almost the same time. However,
this mechanism is replaced by SINK_TX_OK and SINK_TX_NG. Skip the check
in PD3.0 to avoid the deadlock when source is requesting DR_SWAP where
sink is requesting DISCOVER_IDENTITY.
Signed-off-by: Guan-Yu Lin <guanyulin@google.com>
---
drivers/usb/typec/tcpm/tcpm.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 058d5b853b57..ff3c171a3a75 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -2847,7 +2847,7 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
PD_MSG_CTRL_NOT_SUPP,
NONE_AMS);
} else {
- if (port->send_discover) {
+ if (port->send_discover && port->negotiated_rev < PD_REV30) {
tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
break;
}
@@ -2863,7 +2863,7 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
PD_MSG_CTRL_NOT_SUPP,
NONE_AMS);
} else {
- if (port->send_discover) {
+ if (port->send_discover && port->negotiated_rev < PD_REV30) {
tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
break;
}
@@ -2872,7 +2872,7 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
}
break;
case PD_CTRL_VCONN_SWAP:
- if (port->send_discover) {
+ if (port->send_discover && port->negotiated_rev < PD_REV30) {
tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
break;
}
--
2.43.0.rc0.421.g78406f8d94-goog
next reply other threads:[~2023-11-16 8:32 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-16 8:32 Guan-Yu Lin [this message]
2023-11-21 14:15 ` [PATCH] usb: typec: tcpm: skip checking port->send_discover in PD3.0 Heikki Krogerus
2023-11-21 14:47 ` Guenter Roeck
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