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usb: typec: tcpm: add tcpm_port_error_recovery symbol

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Add tcpm_port_error_recovery symbol and corresponding event that runs in
tcpm_pd_event handler to set the port to the ERROR_RECOVERY state. tcpci
drivers can use the symbol to reset the port when tcpc faults affect port
functionality.

Signed-off-by: RD Babiera <rdbabiera@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20231121203845.170234-5-rdbabiera@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
RD Babiera 2023-11-21 20:38:47 +00:00 committed by Greg Kroah-Hartman
parent 9f802703fd
commit db9e547098
2 changed files with 15 additions and 0 deletions
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14
drivers/usb/typec/tcpm/tcpm.c
View File

@ -251,6 +251,7 @@ enum frs_typec_current {
#define TCPM_FRS_EVENT BIT(3)
#define TCPM_SOURCING_VBUS BIT(4)
#define TCPM_PORT_CLEAN BIT(5)
#define TCPM_PORT_ERROR BIT(6)
#define LOG_BUFFER_ENTRIES 1024
#define LOG_BUFFER_ENTRY_SIZE 128
@ -5487,6 +5488,10 @@ static void tcpm_pd_event_handler(struct kthread_work *work)
tcpm_set_state(port, tcpm_default_state(port), 0);
}
}
if (events & TCPM_PORT_ERROR) {
tcpm_log(port, "port triggering error recovery");
tcpm_set_state(port, ERROR_RECOVERY, 0);
}
spin_lock(&port->pd_event_lock);
}
@ -5554,6 +5559,15 @@ bool tcpm_port_is_toggling(struct tcpm_port *port)
}
EXPORT_SYMBOL_GPL(tcpm_port_is_toggling);
void tcpm_port_error_recovery(struct tcpm_port *port)
{
spin_lock(&port->pd_event_lock);
port->pd_events |= TCPM_PORT_ERROR;
spin_unlock(&port->pd_event_lock);
kthread_queue_work(port->wq, &port->event_work);
}
EXPORT_SYMBOL_GPL(tcpm_port_error_recovery);
static void tcpm_enable_frs_work(struct kthread_work *work)
{
struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs);

1
include/linux/usb/tcpm.h
View File

@ -173,5 +173,6 @@ void tcpm_pd_hard_reset(struct tcpm_port *port);
void tcpm_tcpc_reset(struct tcpm_port *port);
void tcpm_port_clean(struct tcpm_port *port);
bool tcpm_port_is_toggling(struct tcpm_port *port);
void tcpm_port_error_recovery(struct tcpm_port *port);
#endif /* __LINUX_USB_TCPM_H */