[2/5] USB: typec: tcpm: Hard Reset after not receiving a Request

Message ID 20201210160521.3417426-3-gregkh@linuxfoundation.org
State New
Headers show
Series
  • USB: typec: various patches
Related show

Commit Message

Greg KH Dec. 10, 2020, 4:05 p.m.
From: pumahsu <pumahsu@google.com>

PD 3.0 spec 8.3.3.2.3, A Get_Source_Cap message is sent
to a UUT that is in the PE_SRC_Ready state. After sending
a Source_Capabilities message, the UUT should then expect
a Request message in response. When one is not received,
the UUT should timeout to PE_SRC_Hard_Reset.

Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Badhri Jagan Sridharan <badhri@google.com>
Signed-off-by: pumahsu <pumahsu@google.com>
Signed-off-by: Kyle Tso <kyletso@google.com>
Signed-off-by: Will McVicker <willmcvicker@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/typec/tcpm/tcpm.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 0ceeab50ed64..0efda59bb104 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -2218,6 +2218,7 @@  static int tcpm_pd_send_control(struct tcpm_port *port,
 static bool tcpm_send_queued_message(struct tcpm_port *port)
 {
 	enum pd_msg_request queued_message;
+	int ret;
 
 	do {
 		queued_message = port->queued_message;
@@ -2237,7 +2238,16 @@  static bool tcpm_send_queued_message(struct tcpm_port *port)
 			tcpm_pd_send_sink_caps(port);
 			break;
 		case PD_MSG_DATA_SOURCE_CAP:
-			tcpm_pd_send_source_caps(port);
+			ret = tcpm_pd_send_source_caps(port);
+			if (ret < 0) {
+				tcpm_log(port,
+					 "Unable to send src caps, ret=%d",
+					 ret);
+				tcpm_set_state(port, SOFT_RESET_SEND, 0);
+			} else if (port->pwr_role == TYPEC_SOURCE) {
+				tcpm_set_state(port, HARD_RESET_SEND,
+					       PD_T_SENDER_RESPONSE);
+			}
 			break;
 		default:
 			break;