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usb: typec: tcpm: Properly handle Alert and Status Messages

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When receiving Alert Message, if it is not unexpected but is
unsupported for some reason, the port should return Not_Supported
Message response.

Also, according to PD3.0 Spec 6.5.2.1.4 Event Flags Field, the
OTP/OVP/OCP flags in the Event Flags field in Status Message no longer
require Get_PPS_Status Message to clear them. Thus remove it when
receiving Status Message with those flags being set.

In addition, add the missing AMS operations for Status Message.

Fixes: 64f7c494a3 ("typec: tcpm: Add support for sink PPS related messages")
Fixes: 0908c5aca3 ("usb: typec: tcpm: AMS and Collision Avoidance")
Signed-off-by: Kyle Tso <kyletso@google.com>
Link: https://lore.kernel.org/r/20210531164928.2368606-1-kyletso@google.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kyle Tso 2021-06-01 00:49:28 +08:00 committed by Greg Kroah-Hartman
parent 4d2aa178d2
commit 063933f47a
2 changed files with 27 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/usb/typec/tcpm/tcpm.c
View File

@ -2188,20 +2188,25 @@ static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
if (!type) {
tcpm_log(port, "Alert message received with no type");
tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
return;
}
/* Just handling non-battery alerts for now */
if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
switch (port->state) {
case SRC_READY:
case SNK_READY:
if (port->pwr_role == TYPEC_SOURCE) {
port->upcoming_state = GET_STATUS_SEND;
tcpm_ams_start(port, GETTING_SOURCE_SINK_STATUS);
} else {
/*
* Do not check SinkTxOk here in case the Source doesn't set its Rp to
* SinkTxOk in time.
*/
port->ams = GETTING_SOURCE_SINK_STATUS;
tcpm_set_state(port, GET_STATUS_SEND, 0);
break;
default:
tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
break;
}
} else {
tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
}
}
@ -2445,6 +2450,11 @@ static void tcpm_pd_data_request(struct tcpm_port *port,
tcpm_pd_handle_state(port, BIST_RX, BIST, 0);
break;
case PD_DATA_ALERT:
if (port->state != SRC_READY && port->state != SNK_READY)
tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
NONE_AMS, 0);
else
tcpm_handle_alert(port, msg->payload, cnt);
break;
case PD_DATA_BATT_STATUS:
@ -2769,24 +2779,16 @@ static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
switch (type) {
case PD_EXT_STATUS:
/*
* If PPS related events raised then get PPS status to clear
* (see USB PD 3.0 Spec, 6.5.2.4)
*/
if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
USB_PD_EXT_SDB_PPS_EVENTS)
tcpm_pd_handle_state(port, GET_PPS_STATUS_SEND,
GETTING_SOURCE_SINK_STATUS, 0);
else
tcpm_pd_handle_state(port, ready_state(port), NONE_AMS, 0);
break;
case PD_EXT_PPS_STATUS:
/*
* For now the PPS status message is used to clear events
* and nothing more.
*/
tcpm_pd_handle_state(port, ready_state(port), NONE_AMS, 0);
if (port->ams == GETTING_SOURCE_SINK_STATUS) {
tcpm_ams_finish(port);
tcpm_set_state(port, ready_state(port), 0);
} else {
/* unexpected Status or PPS_Status Message */
tcpm_pd_handle_state(port, port->pwr_role == TYPEC_SOURCE ?
SRC_SOFT_RESET_WAIT_SNK_TX : SNK_SOFT_RESET,
NONE_AMS, 0);
}
break;
case PD_EXT_SOURCE_CAP_EXT:
case PD_EXT_GET_BATT_CAP:

4
include/linux/usb/pd_ext_sdb.h
View File

@ -24,8 +24,4 @@ enum usb_pd_ext_sdb_fields {
#define USB_PD_EXT_SDB_EVENT_OVP BIT(3)
#define USB_PD_EXT_SDB_EVENT_CF_CV_MODE BIT(4)
#define USB_PD_EXT_SDB_PPS_EVENTS (USB_PD_EXT_SDB_EVENT_OCP | \
USB_PD_EXT_SDB_EVENT_OTP | \
USB_PD_EXT_SDB_EVENT_OVP)
#endif /* __LINUX_USB_PD_EXT_SDB_H */