From: Badhri Jagan Sridharan <badhri@google.com>
To: Guenter Roeck <linux@roeck-us.net>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kyle Tso <kyletso@google.com>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Badhri Jagan Sridharan <badhri@google.com>
Subject: [PATCH v2 1/3] usb: typec: tcpm: Add Callback to Usb Communication capable partner
Date: Mon, 1 Feb 2021 16:30:59 -0800 [thread overview]
Message-ID: <20210202003101.221145-1-badhri@google.com> (raw)
The USB Communications Capable bit indicates if port
partner is capable of communication over the USB data lines
(e.g. D+/- or SS Tx/Rx). Notify the status of the bit to low
level drivers to perform chip specific operation.
For instance, low level driver enables USB switches on D+/D-
lines to set up data path when the bit is set.
Refactored from patch initially authored by
Kyle Tso <kyletso@google.com>
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
---
Changes since V1:
- Removed partner_usb_comm_capable flag.
- Fixed capable flag for SNK_NEGOTIATE_CAPABILITIES.
---
drivers/usb/typec/tcpm/tcpm.c | 13 +++++++++++++
include/linux/usb/tcpm.h | 5 +++++
2 files changed, 18 insertions(+)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 0afd8ef692e8..997a1a56c161 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -3429,6 +3429,14 @@ static void tcpm_unregister_altmodes(struct tcpm_port *port)
memset(modep, 0, sizeof(*modep));
}
+static void tcpm_set_partner_usb_comm_capable(struct tcpm_port *port, bool capable)
+{
+ tcpm_log(port, "Setting usb_comm capable %s", capable ? "true" : "false");
+
+ if (port->tcpc->set_partner_usb_comm_capable)
+ port->tcpc->set_partner_usb_comm_capable(port->tcpc, capable);
+}
+
static void tcpm_reset_port(struct tcpm_port *port)
{
int ret;
@@ -3445,6 +3453,7 @@ static void tcpm_reset_port(struct tcpm_port *port)
port->attached = false;
port->pd_capable = false;
port->pps_data.supported = false;
+ tcpm_set_partner_usb_comm_capable(port, false);
/*
* First Rx ID should be 0; set this to a sentinel of -1 so that
@@ -3785,6 +3794,8 @@ static void run_state_machine(struct tcpm_port *port)
}
} else {
tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
+ tcpm_set_partner_usb_comm_capable(port,
+ !!(port->sink_request & RDO_USB_COMM));
tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
PD_T_SRC_TRANSITION);
}
@@ -4004,6 +4015,8 @@ static void run_state_machine(struct tcpm_port *port)
break;
case SNK_NEGOTIATE_CAPABILITIES:
port->pd_capable = true;
+ tcpm_set_partner_usb_comm_capable(port,
+ !!(port->source_caps[0] & PDO_FIXED_USB_COMM));
port->hard_reset_count = 0;
ret = tcpm_pd_send_request(port);
if (ret < 0) {
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index 3af99f85e8b9..42fcfbe10590 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -108,6 +108,10 @@ enum tcpm_transmit_type {
* is supported by TCPC, set this callback for TCPM to query
* whether vbus is at VSAFE0V when needed.
* Returns true when vbus is at VSAFE0V, false otherwise.
+ * @set_partner_usb_comm_capable:
+ * Optional; The USB Communications Capable bit indicates if port
+ * partner is capable of communication over the USB data lines
+ * (e.g. D+/- or SS Tx/Rx). Called to notify the status of the bit.
*/
struct tcpc_dev {
struct fwnode_handle *fwnode;
@@ -139,6 +143,7 @@ struct tcpc_dev {
int (*set_auto_vbus_discharge_threshold)(struct tcpc_dev *dev, enum typec_pwr_opmode mode,
bool pps_active, u32 requested_vbus_voltage);
bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev);
+ void (*set_partner_usb_comm_capable)(struct tcpc_dev *dev, bool enable);
};
struct tcpm_port;
--
2.30.0.365.g02bc693789-goog
next reply other threads:[~2021-02-02 0:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-02 0:30 Badhri Jagan Sridharan [this message]
2021-02-02 0:31 ` [PATCH v2 2/3] usb: typec: tcpci: Add Callback to Usb Communication capable partner Badhri Jagan Sridharan
2021-02-02 8:49 ` Heikki Krogerus
2021-02-02 16:25 ` Guenter Roeck
2021-02-02 0:31 ` [PATCH v2 3/3] usb: typec: tcpci_maxim: Enable data path when partner is USB Comm capable Badhri Jagan Sridharan
2021-02-02 8:52 ` Heikki Krogerus
2021-02-02 16:25 ` Guenter Roeck
2021-02-02 4:34 ` [PATCH v2 1/3] usb: typec: tcpm: Add Callback to Usb Communication capable partner Badhri Jagan Sridharan
2021-02-02 8:37 ` Heikki Krogerus
2021-02-02 16:25 ` Guenter Roeck
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210202003101.221145-1-badhri@google.com \
--to=badhri@google.com \
--cc=gregkh@linuxfoundation.org \
--cc=heikki.krogerus@linux.intel.com \
--cc=kyletso@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=linux@roeck-us.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).