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usb: typec: tcpm: Notify the tcpc to start connection-detection for SRPs

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Some tcpc device-drivers need to explicitly be told to watch for connection
events, otherwise the tcpc will not generate any TCPM_CC_EVENTs and devices
being plugged into the Type-C port will not be noticed.

For dual-role ports tcpm_start_drp_toggling() is used to tell the tcpc to
watch for connection events. Sofar we lack a similar callback to the tcpc
for single-role ports. With some tcpc-s such as the fusb302 this means
no TCPM_CC_EVENTs will be generated when the port is configured as a
single-role port.

This commit renames start_drp_toggling to start_toggling and since the
device-properties are parsed by the tcpm-core, adds a port_type parameter
to the start_toggling callback so that the tcpc_dev driver knows the
port-type and can act accordingly when it starts toggling.

The new start_toggling callback now always gets called if defined, instead
of only being called for DRP ports.

To avoid this causing undesirable functional changes all existing
start_drp_toggling implementations are not only renamed to start_toggling,
but also get a port_type check added and return -EOPNOTSUPP when port_type
is not DRP.

Fixes: ea3b4d5523bc("usb: typec: fusb302: Resolve fixed power role ...")
Cc: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2019-04-16 22:07:52 +02:00 committed by Greg Kroah-Hartman
parent 9bcb762ce0
commit 7893f9e1c2
5 changed files with 42 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/usb/typec/tcpm/fusb302.c
View File

@ -876,13 +876,17 @@ done:
return ret;
}
static int tcpm_start_drp_toggling(struct tcpc_dev *dev,
enum typec_cc_status cc)
static int tcpm_start_toggling(struct tcpc_dev *dev,
enum typec_port_type port_type,
enum typec_cc_status cc)
{
struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
tcpc_dev);
int ret = 0;
if (port_type != TYPEC_PORT_DRP)
return -EOPNOTSUPP;
mutex_lock(&chip->lock);
ret = fusb302_set_src_current(chip, cc_src_current[cc]);
if (ret < 0) {
@ -1088,7 +1092,7 @@ static void init_tcpc_dev(struct tcpc_dev *fusb302_tcpc_dev)
fusb302_tcpc_dev->set_vbus = tcpm_set_vbus;
fusb302_tcpc_dev->set_pd_rx = tcpm_set_pd_rx;
fusb302_tcpc_dev->set_roles = tcpm_set_roles;
fusb302_tcpc_dev->start_drp_toggling = tcpm_start_drp_toggling;
fusb302_tcpc_dev->start_toggling = tcpm_start_toggling;
fusb302_tcpc_dev->pd_transmit = tcpm_pd_transmit;
}

10
drivers/usb/typec/tcpm/tcpci.c
View File

@ -100,13 +100,17 @@ static int tcpci_set_cc(struct tcpc_dev *tcpc, enum typec_cc_status cc)
return 0;
}
static int tcpci_start_drp_toggling(struct tcpc_dev *tcpc,
enum typec_cc_status cc)
static int tcpci_start_toggling(struct tcpc_dev *tcpc,
enum typec_port_type port_type,
enum typec_cc_status cc)
{
int ret;
struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
unsigned int reg = TCPC_ROLE_CTRL_DRP;
if (port_type != TYPEC_PORT_DRP)
return -EOPNOTSUPP;
/* Handle vendor drp toggling */
if (tcpci->data->start_drp_toggling) {
ret = tcpci->data->start_drp_toggling(tcpci, tcpci->data, cc);
@ -511,7 +515,7 @@ struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data)
tcpci->tcpc.get_cc = tcpci_get_cc;
tcpci->tcpc.set_polarity = tcpci_set_polarity;
tcpci->tcpc.set_vconn = tcpci_set_vconn;
tcpci->tcpc.start_drp_toggling = tcpci_start_drp_toggling;
tcpci->tcpc.start_toggling = tcpci_start_toggling;
tcpci->tcpc.set_pd_rx = tcpci_set_pd_rx;
tcpci->tcpc.set_roles = tcpci_set_roles;

32
drivers/usb/typec/tcpm/tcpm.c
View File

@ -31,7 +31,7 @@
#define FOREACH_STATE(S) \
S(INVALID_STATE), \
S(DRP_TOGGLING), \
S(TOGGLING), \
S(SRC_UNATTACHED), \
S(SRC_ATTACH_WAIT), \
S(SRC_ATTACHED), \
@ -472,7 +472,7 @@ static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
/* Do not log while disconnected and unattached */
if (tcpm_port_is_disconnected(port) &&
(port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
port->state == DRP_TOGGLING))
port->state == TOGGLING))
return;
va_start(args, fmt);
@ -2540,20 +2540,16 @@ static int tcpm_set_charge(struct tcpm_port *port, bool charge)
return 0;
}
static bool tcpm_start_drp_toggling(struct tcpm_port *port,
enum typec_cc_status cc)
static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
{
int ret;
if (port->tcpc->start_drp_toggling &&
port->port_type == TYPEC_PORT_DRP) {
tcpm_log_force(port, "Start DRP toggling");
ret = port->tcpc->start_drp_toggling(port->tcpc, cc);
if (!ret)
return true;
}
if (!port->tcpc->start_toggling)
return false;
return false;
tcpm_log_force(port, "Start toggling");
ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
return ret == 0;
}
static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
@ -2847,15 +2843,15 @@ static void run_state_machine(struct tcpm_port *port)
port->enter_state = port->state;
switch (port->state) {
case DRP_TOGGLING:
case TOGGLING:
break;
/* SRC states */
case SRC_UNATTACHED:
if (!port->non_pd_role_swap)
tcpm_swap_complete(port, -ENOTCONN);
tcpm_src_detach(port);
if (tcpm_start_drp_toggling(port, tcpm_rp_cc(port))) {
tcpm_set_state(port, DRP_TOGGLING, 0);
if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
tcpm_set_state(port, TOGGLING, 0);
break;
}
tcpm_set_cc(port, tcpm_rp_cc(port));
@ -3053,8 +3049,8 @@ static void run_state_machine(struct tcpm_port *port)
tcpm_swap_complete(port, -ENOTCONN);
tcpm_pps_complete(port, -ENOTCONN);
tcpm_snk_detach(port);
if (tcpm_start_drp_toggling(port, TYPEC_CC_RD)) {
tcpm_set_state(port, DRP_TOGGLING, 0);
if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
tcpm_set_state(port, TOGGLING, 0);
break;
}
tcpm_set_cc(port, TYPEC_CC_RD);
@ -3621,7 +3617,7 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
: "connected");
switch (port->state) {
case DRP_TOGGLING:
case TOGGLING:
if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
tcpm_port_is_source(port))
tcpm_set_state(port, SRC_ATTACH_WAIT, 0);

10
drivers/usb/typec/tcpm/wcove.c
View File

@ -416,12 +416,16 @@ static int wcove_pd_transmit(struct tcpc_dev *tcpc,
return regmap_write(wcove->regmap, USBC_TXCMD, cmd | USBC_TXCMD_START);
}
static int wcove_start_drp_toggling(struct tcpc_dev *tcpc,
enum typec_cc_status cc)
static int wcove_start_toggling(struct tcpc_dev *tcpc,
enum typec_port_type port_type,
enum typec_cc_status cc)
{
struct wcove_typec *wcove = tcpc_to_wcove(tcpc);
unsigned int usbc_ctrl;
if (port_type != TYPEC_PORT_DRP)
return -EOPNOTSUPP;
usbc_ctrl = USBC_CONTROL1_MODE_DRP | USBC_CONTROL1_DRPTOGGLE_RANDOM;
switch (cc) {
@ -639,7 +643,7 @@ static int wcove_typec_probe(struct platform_device *pdev)
wcove->tcpc.set_polarity = wcove_set_polarity;
wcove->tcpc.set_vconn = wcove_set_vconn;
wcove->tcpc.set_current_limit = wcove_set_current_limit;
wcove->tcpc.start_drp_toggling = wcove_start_drp_toggling;
wcove->tcpc.start_toggling = wcove_start_toggling;
wcove->tcpc.set_pd_rx = wcove_set_pd_rx;
wcove->tcpc.set_roles = wcove_set_roles;

13
include/linux/usb/tcpm.h
View File

@ -121,10 +121,10 @@ struct tcpc_config {
* with partner.
* @set_pd_rx: Called to enable or disable reception of PD messages
* @set_roles: Called to set power and data roles
* @start_drp_toggling:
* Optional; if supported by hardware, called to start DRP
* toggling. DRP toggling is stopped automatically if
* a connection is established.
* @start_toggling:
* Optional; if supported by hardware, called to start dual-role
* toggling or single-role connection detection. Toggling stops
* automatically if a connection is established.
* @try_role: Optional; called to set a preferred role
* @pd_transmit:Called to transmit PD message
* @mux: Pointer to multiplexer data
@ -147,8 +147,9 @@ struct tcpc_dev {
int (*set_pd_rx)(struct tcpc_dev *dev, bool on);
int (*set_roles)(struct tcpc_dev *dev, bool attached,
enum typec_role role, enum typec_data_role data);
int (*start_drp_toggling)(struct tcpc_dev *dev,
enum typec_cc_status cc);
int (*start_toggling)(struct tcpc_dev *dev,
enum typec_port_type port_type,
enum typec_cc_status cc);
int (*try_role)(struct tcpc_dev *dev, int role);
int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type type,
const struct pd_message *msg);