usb: typec: ps883x: Add USB4 mode and TBT3 altmode support

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@oss.qualcomm.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20251014-topic-ps883x_usb4-v1-3-e6adb1a4296e@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/mux/ps883x.c b/drivers/usb/typec/mux/ps883x.c
index 72f1e737ca4baab524bc43487c70c2f1f24d3f76..7c61629b36d659b06d2ed71de71d022bb400a64c 100644 (file)
--- 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 55dcea12082c80defeb6f199ad333279b58adcd7..0b570f1b8bc8ee2f8126fc2e0a64ed3bd857b2ff 100644 (file)
--- 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 */