[PATCH v2 1/3] Bluetooth: btnxpuart: Add correct bootloader error codes

[Neeraj Sanjay Kale <neeraj.sanjaykale@xxxxxxx>]

This corrects the bootloader error codes for NXP chipsets.
Since we have a common handling for all error codes, there is no backward
compatibility issue.
Added error handling for CRC error code in V3 bootloader signature.

Fixes: 27489364299a ("Bluetooth: btnxpuart: Add handling for boot-signature timeout errors")
Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@xxxxxxx>
---
 drivers/bluetooth/btnxpuart.c | 57 +++++++++++++++++++++--------------
 1 file changed, 35 insertions(+), 22 deletions(-)

diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c
index 021983686cb3..b8a00bf062e2 100644
--- a/drivers/bluetooth/btnxpuart.c
+++ b/drivers/bluetooth/btnxpuart.c
@@ -204,10 +204,11 @@ struct btnxpuart_dev {
 #define NXP_NAK_V3		0x7b
 #define NXP_CRC_ERROR_V3	0x7c
 
-/* Bootloader signature error codes */
-#define NXP_ACK_RX_TIMEOUT	0x0002	/* ACK not received from host */
-#define NXP_HDR_RX_TIMEOUT	0x0003	/* FW Header chunk not received */
-#define NXP_DATA_RX_TIMEOUT	0x0004	/* FW Data chunk not received */
+/* Bootloader signature error codes: Refer AN12820 from nxp.com */
+#define NXP_CRC_RX_ERROR	BIT(0)	/* CRC error in previous packet */
+#define NXP_ACK_RX_TIMEOUT	BIT(2)	/* ACK not received from host */
+#define NXP_HDR_RX_TIMEOUT	BIT(3)	/* FW Header chunk not received */
+#define NXP_DATA_RX_TIMEOUT	BIT(4)	/* FW Data chunk not received */
 
 #define HDR_LEN			16
 
@@ -310,6 +311,16 @@ union nxp_v3_rx_timeout_nak_u {
 	u8 buf[6];
 };
 
+struct nxp_v3_crc_nak {
+	u8 nak;
+	u8 crc;
+} __packed;
+
+union nxp_v3_crc_nak_u {
+	struct nxp_v3_crc_nak pkt;
+	u8 buf[2];
+};
+
 static u8 crc8_table[CRC8_TABLE_SIZE];
 
 /* Default configurations */
@@ -1059,25 +1070,27 @@ static void nxp_handle_fw_download_error(struct hci_dev *hdev, struct v3_data_re
 	struct btnxpuart_dev *nxpdev = hci_get_drvdata(hdev);
 	__u32 offset = __le32_to_cpu(req->offset);
 	__u16 err = __le16_to_cpu(req->error);
-	union nxp_v3_rx_timeout_nak_u nak_tx_buf;
-
-	switch (err) {
-	case NXP_ACK_RX_TIMEOUT:
-	case NXP_HDR_RX_TIMEOUT:
-	case NXP_DATA_RX_TIMEOUT:
-		nak_tx_buf.pkt.nak = NXP_NAK_V3;
-		nak_tx_buf.pkt.offset = __cpu_to_le32(offset);
-		nak_tx_buf.pkt.crc = crc8(crc8_table, nak_tx_buf.buf,
-				      sizeof(nak_tx_buf) - 1, 0xff);
-		serdev_device_write_buf(nxpdev->serdev, nak_tx_buf.buf,
-					sizeof(nak_tx_buf));
-		break;
-	default:
-		bt_dev_dbg(hdev, "Unknown bootloader error code: %d", err);
-		break;
-
+	union nxp_v3_rx_timeout_nak_u timeout_nak_buf;
+	union nxp_v3_crc_nak_u crc_nak_buf;
+
+	if (err & NXP_CRC_RX_ERROR) {
+		crc_nak_buf.pkt.nak = NXP_CRC_ERROR_V3;
+		crc_nak_buf.pkt.crc = crc8(crc8_table, crc_nak_buf.buf,
+					   sizeof(crc_nak_buf) - 1, 0xff);
+		serdev_device_write_buf(nxpdev->serdev, crc_nak_buf.buf,
+					sizeof(crc_nak_buf));
+	} else if (err & NXP_ACK_RX_TIMEOUT ||
+		   err & NXP_HDR_RX_TIMEOUT ||
+		   err & NXP_DATA_RX_TIMEOUT) {
+		timeout_nak_buf.pkt.nak = NXP_NAK_V3;
+		timeout_nak_buf.pkt.offset = __cpu_to_le32(offset);
+		timeout_nak_buf.pkt.crc = crc8(crc8_table, timeout_nak_buf.buf,
+					       sizeof(timeout_nak_buf) - 1, 0xff);
+		serdev_device_write_buf(nxpdev->serdev, timeout_nak_buf.buf,
+					sizeof(timeout_nak_buf));
+	} else {
+		bt_dev_err(hdev, "Unknown bootloader error code: %d", err);
 	}
-
 }
 
 static int nxp_recv_fw_req_v3(struct hci_dev *hdev, struct sk_buff *skb)
-- 
2.25.1