[PATCH] usb: typec: tipd: Fix Thunderbolt altmode VDOs for cd321x

[Sven Peter <sven@kernel.org>]

The Intel VID status register is actually 9 bytes long and doesn't
contain the raw VDOs but only the upper 16bits for device mode and enter
mode. Shift those two fields into place and reconstruct the cable
discover mode VDO from the data status register instead since it's not
directly accessible. With this fixed now the correct VDOs are forwarded
to the PHY and the to-be-submitted Thunderbolt/USB4 native host interface
so that the right mode can be negotiated and the link actually comes up.

Link: https://www.ti.com/lit/ug/slvubh2b/slvubh2b.pdf
Fixes: 0b31c978935f ("usb: typec: tipd: Read USB4, Thunderbolt and DisplayPort status for cd321x")
Fixes: 82432bbfb9e8 ("usb: typec: tipd: Handle mode transitions for CD321x")
Cc: stable@vger.kernel.org
Signed-off-by: Sven Peter <sven@kernel.org>
---
 drivers/usb/typec/tipd/core.c     | 17 +++++++++++++----
 drivers/usb/typec/tipd/tps6598x.h |  4 ++--
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index d5ee0af9058b..159d1a2f9a1f 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -114,7 +114,6 @@ struct tps6598x_intel_vid_status_reg {
 	__le32 attention_vdo;
 	__le16 enter_vdo;
 	__le16 device_mode;
-	__le16 cable_mode;
 } __packed;
 
 /* Standard Task return codes */
@@ -700,9 +699,19 @@ static void cd321x_typec_update_mode(struct tps6598x *tps, struct cd321x_status
 		   cd321x->state.mode == TYPEC_TBT_MODE)
 			return;
 
-		tbt_data.cable_mode = le16_to_cpu(st->intel_vid_status.cable_mode);
-		tbt_data.device_mode = le16_to_cpu(st->intel_vid_status.device_mode);
-		tbt_data.enter_vdo = le16_to_cpu(st->intel_vid_status.enter_vdo);
+		tbt_data.cable_mode = TBT_MODE |
+			TBT_SET_CABLE_SPEED(TPS_DATA_STATUS_TBT_CABLE_SPEED(st->data_status)) |
+			TBT_SET_CABLE_ROUNDED(TPS_DATA_STATUS_TBT_CABLE_GEN(st->data_status));
+		if (st->data_status & TPS_DATA_STATUS_OPTICAL_CABLE)
+			tbt_data.cable_mode |= TBT_CABLE_OPTICAL;
+		if (st->data_status & TPS_DATA_STATUS_ACTIVE_LINK_TRAIN)
+			tbt_data.cable_mode |= TBT_CABLE_LINK_TRAINING;
+		if (st->data_status & TPS_DATA_STATUS_ACTIVE_CABLE)
+			tbt_data.cable_mode |= TBT_CABLE_ACTIVE_PASSIVE;
+		tbt_data.device_mode = TBT_MODE |
+			(u32)le16_to_cpu(st->intel_vid_status.device_mode) << 16;
+		tbt_data.enter_vdo =
+			(u32)le16_to_cpu(st->intel_vid_status.enter_vdo) << 16;
 		cd321x->state.alt = cd321x->port_altmode_tbt;
 		cd321x->state.mode = TYPEC_TBT_MODE;
 		cd321x->state.data = &tbt_data;
diff --git a/drivers/usb/typec/tipd/tps6598x.h b/drivers/usb/typec/tipd/tps6598x.h
index 03edbb77bbd6..d172c84ada74 100644
--- a/drivers/usb/typec/tipd/tps6598x.h
+++ b/drivers/usb/typec/tipd/tps6598x.h
@@ -206,10 +206,10 @@
 #define TPS_DATA_STATUS_DP_PIN_ASSIGNMENT(x) \
 	TPS_FIELD_GET(TPS_DATA_STATUS_DP_PIN_ASSIGNMENT_MASK, (x))
 #define TPS_DATA_STATUS_TBT_CABLE_SPEED_MASK   GENMASK(27, 25)
-#define TPS_DATA_STATUS_TBT_CABLE_SPEED \
+#define TPS_DATA_STATUS_TBT_CABLE_SPEED(x) \
 	TPS_FIELD_GET(TPS_DATA_STATUS_TBT_CABLE_SPEED_MASK, (x))
 #define TPS_DATA_STATUS_TBT_CABLE_GEN_MASK     GENMASK(29, 28)
-#define TPS_DATA_STATUS_TBT_CABLE_GEN \
+#define TPS_DATA_STATUS_TBT_CABLE_GEN(x) \
 	TPS_FIELD_GET(TPS_DATA_STATUS_TBT_CABLE_GEN_MASK, (x))
 
 /* Map data status to DP spec assignments */

---
base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482
change-id: 20260813-b4-tipd-vdo-fix-44e65b48aea3

Best regards,
--  
Sven Peter <sven@kernel.org>