linux-kernel - [PATCH 3/3] usb: typec: ps883x: Add USB4 mode and TBT3 altmode support

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Message-Id: <20251014-topic-ps883x_usb4-v1-3-e6adb1a4296e@oss.qualcomm.com>
Date: Tue, 14 Oct 2025 18:06:47 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
 Bjorn Andersson <bjorn.andersson@....qualcomm.com>, 
 Wesley Cheng <wesley.cheng@....qualcomm.com>, 
 Jack Pham <jack.pham@....qualcomm.com>, 
 Raghavendra Thoorpu <rthoorpu@....qualcomm.com>, linux-usb@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH 3/3] usb: typec: ps883x: Add USB4 mode and TBT3 altmode
 support

From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

This chip can do some more than the driver currently describes. Add
support for configuring it for various flavors of TBT3/USB4 operation.

Reviewed-by: Jack Pham <jack.pham@....qualcomm.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
---
 drivers/usb/typec/mux/ps883x.c | 29 +++++++++++++++++++++++++++++
 include/linux/usb/typec_tbt.h  |  1 +
 2 files changed, 30 insertions(+)

diff --git a/drivers/usb/typec/mux/ps883x.c b/drivers/usb/typec/mux/ps883x.c
index 72f1e737ca4b..7c61629b36d6 100644
--- a/drivers/usb/typec/mux/ps883x.c
+++ b/drivers/usb/typec/mux/ps883x.c
@@ -14,15 +14,18 @@
 #include <linux/mutex.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
+#include <linux/usb/pd.h>
 #include <linux/usb/typec_altmode.h>
 #include <linux/usb/typec_dp.h>
 #include <linux/usb/typec_mux.h>
 #include <linux/usb/typec_retimer.h>
+#include <linux/usb/typec_tbt.h>
 
 #define REG_USB_PORT_CONN_STATUS_0		0x00
 
 #define CONN_STATUS_0_CONNECTION_PRESENT	BIT(0)
 #define CONN_STATUS_0_ORIENTATION_REVERSED	BIT(1)
+#define CONN_STATUS_0_ACTIVE_CABLE		BIT(2)
 #define CONN_STATUS_0_USB_3_1_CONNECTED		BIT(5)
 
 #define REG_USB_PORT_CONN_STATUS_1		0x01
@@ -34,6 +37,10 @@
 
 #define REG_USB_PORT_CONN_STATUS_2		0x02
 
+#define CONN_STATUS_2_TBT_CONNECTED		BIT(0)
+#define CONN_STATUS_2_TBT_UNIDIR_LSRX_ACT_LT	BIT(4)
+#define CONN_STATUS_2_USB4_CONNECTED		BIT(7)
+
 struct ps883x_retimer {
 	struct i2c_client *client;
 	struct gpio_desc *reset_gpio;
@@ -95,6 +102,8 @@ static int ps883x_configure(struct ps883x_retimer *retimer, int cfg0,
 
 static int ps883x_set(struct ps883x_retimer *retimer, struct typec_retimer_state *state)
 {
+	struct typec_thunderbolt_data *tb_data;
+	const struct enter_usb_data *eudo_data;
 	int cfg0 = CONN_STATUS_0_CONNECTION_PRESENT;
 	int cfg1 = 0x00;
 	int cfg2 = 0x00;
@@ -120,6 +129,18 @@ static int ps883x_set(struct ps883x_retimer *retimer, struct typec_retimer_state
 				break;
 			}
 			break;
+		case USB_TYPEC_TBT_SID:
+			tb_data = state->data;
+
+			/* Unconditional */
+			cfg2 |= CONN_STATUS_2_TBT_CONNECTED;
+
+			if (tb_data->cable_mode & TBT_CABLE_ACTIVE_PASSIVE)
+				cfg0 |= CONN_STATUS_0_ACTIVE_CABLE;
+
+			if (tb_data->enter_vdo & TBT_ENTER_MODE_UNI_DIR_LSRX)
+				cfg2 |= CONN_STATUS_2_TBT_UNIDIR_LSRX_ACT_LT;
+			break;
 		default:
 			dev_err(&retimer->client->dev, "Got unsupported SID: 0x%x\n",
 				state->alt->svid);
@@ -135,6 +156,14 @@ static int ps883x_set(struct ps883x_retimer *retimer, struct typec_retimer_state
 		case TYPEC_MODE_USB3:
 			cfg0 |= CONN_STATUS_0_USB_3_1_CONNECTED;
 			break;
+		case TYPEC_MODE_USB4:
+			eudo_data = state->data;
+
+			cfg2 |= CONN_STATUS_2_USB4_CONNECTED;
+
+			if (FIELD_GET(EUDO_CABLE_TYPE_MASK, eudo_data->eudo) != EUDO_CABLE_TYPE_PASSIVE)
+				cfg0 |= CONN_STATUS_0_ACTIVE_CABLE;
+			break;
 		default:
 			dev_err(&retimer->client->dev, "Got unsupported mode: %lu\n",
 				state->mode);
diff --git a/include/linux/usb/typec_tbt.h b/include/linux/usb/typec_tbt.h
index 55dcea12082c..0b570f1b8bc8 100644
--- a/include/linux/usb/typec_tbt.h
+++ b/include/linux/usb/typec_tbt.h
@@ -55,6 +55,7 @@ struct typec_thunderbolt_data {
 
 /* TBT3 Device Enter Mode VDO bits */
 #define TBT_ENTER_MODE_CABLE_SPEED(s)	TBT_SET_CABLE_SPEED(s)
+#define TBT_ENTER_MODE_UNI_DIR_LSRX	BIT(23)
 #define TBT_ENTER_MODE_ACTIVE_CABLE	BIT(24)
 
 #endif /* __USB_TYPEC_TBT_H */

-- 
2.51.0