[PATCH] usb: typec: tcpci: pass correct rx_type to tcpm_pd_receive()

[Xu Yang]

From: Xu Yang <xu.yang_2@xxxxxxx>

Previously, tcpci_irq() always passed TCPC_TX_SOP as the receive type
to tcpm_pd_receive(), ignoring the actual frame type reported by the
TCPC_RX_BUF_FRAME_TYPE register.

Read TCPC_RX_BUF_FRAME_TYPE after receiving a PD message and map it to
the appropriate tcpm_transmit_type:
  - TCPC_RX_BUF_FRAME_TYPE_SOP1 -> TCPC_TX_SOP_PRIME
  - TCPC_RX_BUF_FRAME_TYPE_SOP  -> TCPC_TX_SOP (default)

This allows TCPM to correctly distinguish SOP from SOP' messages, which
is required for proper cable plug communication during PD negotiation.

Signed-off-by: Xu Yang <xu.yang_2@xxxxxxx>
---
 drivers/usb/typec/tcpm/tcpci.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
index 7ac7000b2d13..c19413f41bcb 100644
--- a/drivers/usb/typec/tcpm/tcpci.c
+++ b/drivers/usb/typec/tcpm/tcpci.c
@@ -748,7 +748,8 @@ irqreturn_t tcpci_irq(struct tcpci *tcpci)
 
 	if (status & TCPC_ALERT_RX_STATUS) {
 		struct pd_message msg;
-		unsigned int cnt, payload_cnt;
+		unsigned int cnt, type, payload_cnt;
+		enum tcpm_transmit_type rx_type;
 		u16 header;
 
 		regmap_read(tcpci->regmap, TCPC_RX_BYTE_CNT, &cnt);
@@ -763,6 +764,17 @@ irqreturn_t tcpci_irq(struct tcpci *tcpci)
 		else
 			payload_cnt = 0;
 
+		regmap_read(tcpci->regmap, TCPC_RX_BUF_FRAME_TYPE, &type);
+		switch (type) {
+		case TCPC_RX_BUF_FRAME_TYPE_SOP1:
+			rx_type = TCPC_TX_SOP_PRIME;
+			break;
+		case TCPC_RX_BUF_FRAME_TYPE_SOP:
+		default:
+			rx_type = TCPC_TX_SOP;
+			break;
+		}
+
 		tcpci_read16(tcpci, TCPC_RX_HDR, &header);
 		msg.header = cpu_to_le16(header);
 
@@ -776,7 +788,7 @@ irqreturn_t tcpci_irq(struct tcpci *tcpci)
 		/* Read complete, clear RX status alert bit */
 		tcpci_write16(tcpci, TCPC_ALERT, TCPC_ALERT_RX_STATUS);
 
-		tcpm_pd_receive(tcpci->port, &msg, TCPC_TX_SOP);
+		tcpm_pd_receive(tcpci->port, &msg, rx_type);
 	}
 
 	if (tcpci->data->vbus_vsafe0v && (status & TCPC_ALERT_EXTENDED_STATUS)) {
-- 
2.34.1