Commit e00943e9 authored by Badhri Jagan Sridharan's avatar Badhri Jagan Sridharan Committed by Greg Kroah-Hartman
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usb: typec: tcpm: PD3.0 sinks can send Discover Identity even in device mode 



>From 6.4.4.2 Structured VDM:
• Either Port May be an Initiator of Structured VDMs except for the Enter
Mode and Exit Mode Commands which Shall only be initiated by the DFP."

The above implies that when PD3.0 link is established PD3.0 sinks
can send out discover identity command/AMS once PD negotiation is done.
This allows discovering identity for PD3.0 UFP ports as well.

Acked-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: default avatarBadhri Jagan Sridharan <badhri@google.com>
Link: https://lore.kernel.org/r/20210318065604.3757307-1-badhri@google.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 18106234

drivers/usb/typec/tcpm/tcpm.c

+2 −2
Original line number Diff line number Diff line
@@ -3653,8 +3653,8 @@ static inline enum tcpm_state unattached_state(struct tcpm_port *port) 


static void tcpm_check_send_discover(struct tcpm_port *port)

{

	if (port->data_role == TYPEC_HOST && port->send_discover &&

	    port->pd_capable)

	if ((port->data_role == TYPEC_HOST || port->negotiated_rev > PD_REV20) &&

	    port->send_discover && port->pd_capable)

		tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);

	port->send_discover = false;

}