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Subject[PATCH v8 05/12] usb: typec: tcpm: Set USB role switch to device mode when configured as such
Date
From: Hans de Goede <hdegoede@redhat.com>

Setting the mux to MUX_NONE and the switch to USB_SWITCH_DISCONNECT when
the data-role is device is not correct. Plenty of devices support
operating as USB device through a (separate) USB device controller.

We really need 2 different versions of USB_SWITCH_CONNECT,
USB_SWITCH_CONNECT_HOST and USB_SWITCH_DEVICE. Rather then modifying the
tcpc_usb_switch enum for this, simply remove it and switch to the
usb_role enum which provides exactly this, this will save use needing to
convert betweent the 2 enums when calling an usb-role-switch driver later.

Besides switching to the usb_role type, this commit also actually sets the
mux to TYPEC_MUX_USB and the switch to USB_ROLE_DEVICE instead of setting
both to none when the data-role is device.

This commit also makes tcpm_reset_port() call tcpm_mux_set(port,
TYPEC_MUX_NONE, USB_ROLE_NONE) so that the mux and switch
do _not_ stay in their last mode after a detach.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
Changes in v4:
-Add Andy's Reviewed-by

Changes in v3:
-Add Guenter's Reviewed-by

Changes in v2:
-Added Heikki's Reviewed-by
---
drivers/usb/typec/tcpm.c | 22 +++++++++++-----------
include/linux/usb/tcpm.h | 8 ++------
2 files changed, 13 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
index 064b456dcf04..5e527e2e1506 100644
--- a/drivers/usb/typec/tcpm.c
+++ b/drivers/usb/typec/tcpm.c
@@ -607,15 +607,15 @@ void tcpm_pd_transmit_complete(struct tcpm_port *port,
EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);

static int tcpm_mux_set(struct tcpm_port *port, enum tcpc_mux_mode mode,
- enum tcpc_usb_switch config)
+ enum usb_role usb_role)
{
int ret = 0;

- tcpm_log(port, "Requesting mux mode %d, config %d, polarity %d",
- mode, config, port->polarity);
+ tcpm_log(port, "Requesting mux mode %d, usb-role %d, polarity %d",
+ mode, usb_role, port->polarity);

if (port->tcpc->mux)
- ret = port->tcpc->mux->set(port->tcpc->mux, mode, config,
+ ret = port->tcpc->mux->set(port->tcpc->mux, mode, usb_role,
port->polarity);

return ret;
@@ -731,14 +731,15 @@ static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
static int tcpm_set_roles(struct tcpm_port *port, bool attached,
enum typec_role role, enum typec_data_role data)
{
+ enum usb_role usb_role;
int ret;

if (data == TYPEC_HOST)
- ret = tcpm_mux_set(port, TYPEC_MUX_USB,
- TCPC_USB_SWITCH_CONNECT);
+ usb_role = USB_ROLE_HOST;
else
- ret = tcpm_mux_set(port, TYPEC_MUX_NONE,
- TCPC_USB_SWITCH_DISCONNECT);
+ usb_role = USB_ROLE_DEVICE;
+
+ ret = tcpm_mux_set(port, TYPEC_MUX_USB, usb_role);
if (ret < 0)
return ret;

@@ -2085,7 +2086,7 @@ static int tcpm_src_attach(struct tcpm_port *port)
out_disable_pd:
port->tcpc->set_pd_rx(port->tcpc, false);
out_disable_mux:
- tcpm_mux_set(port, TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT);
+ tcpm_mux_set(port, TYPEC_MUX_NONE, USB_ROLE_NONE);
return ret;
}

@@ -2129,6 +2130,7 @@ static void tcpm_reset_port(struct tcpm_port *port)
tcpm_init_vconn(port);
tcpm_set_current_limit(port, 0, 0);
tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
+ tcpm_mux_set(port, TYPEC_MUX_NONE, USB_ROLE_NONE);
tcpm_set_attached_state(port, false);
port->try_src_count = 0;
port->try_snk_count = 0;
@@ -2179,8 +2181,6 @@ static int tcpm_snk_attach(struct tcpm_port *port)
static void tcpm_snk_detach(struct tcpm_port *port)
{
tcpm_detach(port);
-
- /* XXX: (Dis)connect SuperSpeed mux? */
}

static int tcpm_acc_attach(struct tcpm_port *port)
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index 5a5e1d8c5b65..3e8bdaa5085a 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -16,6 +16,7 @@
#define __LINUX_USB_TCPM_H

#include <linux/bitops.h>
+#include <linux/usb/role.h>
#include <linux/usb/typec.h>
#include "pd.h"

@@ -98,11 +99,6 @@ struct tcpc_config {
const struct typec_altmode_desc *alt_modes;
};

-enum tcpc_usb_switch {
- TCPC_USB_SWITCH_CONNECT,
- TCPC_USB_SWITCH_DISCONNECT,
-};
-
/* Mux state attributes */
#define TCPC_MUX_USB_ENABLED BIT(0) /* USB enabled */
#define TCPC_MUX_DP_ENABLED BIT(1) /* DP enabled */
@@ -119,7 +115,7 @@ enum tcpc_mux_mode {

struct tcpc_mux_dev {
int (*set)(struct tcpc_mux_dev *dev, enum tcpc_mux_mode mux_mode,
- enum tcpc_usb_switch usb_config,
+ enum usb_role usb_role,
enum typec_cc_polarity polarity);
bool dfp_only;
void *priv_data;
--
2.16.1
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