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FROMGIT: usb: typec: tcpm: PD3.0 sinks can send Discover Identity even in device mode

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>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: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Link: https://lore.kernel.org/r/20210318065604.3757307-1-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit e00943e916782ae17ca05d654779a84f09481ab8
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-next)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I432847037c8e89cbacc7ca402b23568aa02ef42d
This commit is contained in:
Badhri Jagan Sridharan 2021-03-17 23:56:04 -07:00 committed by Greg Kroah-Hartman
parent 3f7ada406d
commit 36547f2f6d
1 changed files with 2 additions and 2 deletions
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4
drivers/usb/typec/tcpm/tcpm.c
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@ -3689,8 +3689,8 @@ EXPORT_SYMBOL_GPL(tcpm_is_toggling);
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;
}