Hi Guenter,
On 15-04-19 17:51, Guenter Roeck wrote:
On Sat, Apr 13, 2019 at 10:39:53PM +0200, Hans de Goede wrote:
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. But for single-role ports we've so far been
falling back to just calling tcpm_set_cc(). For some tcpc-s such as the
fusb302 this is not enough and no TCPM_CC_EVENT will be generated.
This commit adds a new start_srp_connection_detect callback to tcpc_dev
and when this is implemented calls this in place of start_drp_toggling
for SRP devices.
Do we indeed need an additional callback for this purpose, or would a single
"start_connection_detect" call to replace start_drp_toggling be sufficient ?
If necessary, we could add the port type as argument (if the low level driver
doesn't already know that).
A single "start_connection_detect" call to replace start_drp_toggling will be
sufficient AFAICT.
If you prefer that option, I can rework the patch-set accordingly.
Regards,
Hans
Fixes: ea3b4d5523bc("usb: typec: fusb302: Resolve fixed power role ...")
Cc: Adam Thomson <Adam.Thomson.Opensource@xxxxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/usb/typec/tcpm/tcpm.c | 8 ++++++++
include/linux/usb/tcpm.h | 6 ++++++
2 files changed, 14 insertions(+)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index a2233d72ae7c..1af54af90b50 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -2553,6 +2553,14 @@ static bool tcpm_start_drp_toggling(struct tcpm_port *port,
return true;
}
+ if (port->tcpc->start_srp_connection_detect &&
+ port->port_type != TYPEC_PORT_DRP) {
+ tcpm_log_force(port, "Start SRP connection detection");
+ ret = port->tcpc->start_srp_connection_detect(port->tcpc, cc);
+ if (!ret)
+ return true;
+ }
+
return false;
}
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index 0c532ca3f079..bf2bbbf2e2b2 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -125,6 +125,10 @@ struct tcpc_config {
* Optional; if supported by hardware, called to start DRP
* toggling. DRP toggling is stopped automatically if
* a connection is established.
+ * @start_srp_connection_detect:
+ * Optional; if supported by hardware, called to start connection
+ * detection for single role ports. Connection detection is stopped
+ * 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
@@ -149,6 +153,8 @@ struct tcpc_dev {
enum typec_role role, enum typec_data_role data);
int (*start_drp_toggling)(struct tcpc_dev *dev,
enum typec_cc_status cc);
+ int (*start_srp_connection_detect)(struct tcpc_dev *dev,
+ 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);
--
2.21.0
