--- a/drivers/char/tpm/tpm_tis_spi.c
+++ b/drivers/char/tpm/tpm_tis_spi.c
@@ -61,6 +61,7 @@ static int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len,
 	u8 transfer_len;
 
 	spi_bus_lock(phy->spi_device->master);
+	printk(KERN_INFO "in: %x - out: %x - addr: 0x%x - len:%d\n", in, out, addr, len);
 
 	while (len) {
 		transfer_len = min_t(u16, len, MAX_SPI_FRAMESIZE);
@@ -79,9 +80,14 @@ static int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len,
 		spi_message_init(&m);
 		spi_message_add_tail(&spi_xfer, &m);
 		ret = spi_sync_locked(phy->spi_device, &m);
-		if (ret < 0)
+		if (ret < 0) {
 			goto exit;
+		}
 
+		printk(KERN_INFO "phy->iobuf: 0x%x 0x%x 0x%x 0x%x\n", phy->iobuf[0],
+								      phy->iobuf[1],
+								      phy->iobuf[2],
+								      phy->iobuf[3]);
 		if ((phy->iobuf[3] & 0x01) == 0) {
 			// handle SPI wait states
 			phy->iobuf[0] = 0;
@@ -91,10 +97,12 @@ static int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len,
 				spi_message_init(&m);
 				spi_message_add_tail(&spi_xfer, &m);
 				ret = spi_sync_locked(phy->spi_device, &m);
-				if (ret < 0)
+				if (ret < 0){
 					goto exit;
-				if (phy->iobuf[0] & 0x01)
+				}
+				if (phy->iobuf[0] & 0x01) {
 					break;
+				}
 			}
 
 			if (i == TPM_RETRY) {
@@ -108,8 +116,10 @@ static int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len,
 		spi_xfer.delay_usecs = 5;
 
 		if (in) {
+			printk(KERN_INFO "in => read\n");
 			spi_xfer.tx_buf = NULL;
 		} else if (out) {
+			printk(KERN_INFO "out => write\n");
 			spi_xfer.rx_buf = NULL;
 			memcpy(phy->iobuf, out, transfer_len);
 			out += transfer_len;
@@ -118,10 +128,14 @@ static int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len,
 		spi_message_init(&m);
 		spi_message_add_tail(&spi_xfer, &m);
 		ret = spi_sync_locked(phy->spi_device, &m);
-		if (ret < 0)
+		if (ret < 0) {
+			printk(KERN_INFO "==> spi_sync_locked error\n");
 			goto exit;
+		}
 
 		if (in) {
+			printk(KERN_INFO "transfer_len: %d - phy->iobuf: 0x%x\n", transfer_len,
+										   phy->iobuf[0]);
 			memcpy(in, phy->iobuf, transfer_len);
 			in += transfer_len;
 		}
@@ -130,6 +144,7 @@ static int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len,
 	}
 
 exit:
+	printk(KERN_INFO "exit - spi_bus_unlock\n****\n");
 	spi_bus_unlock(phy->spi_device->master);
 	return ret;
 }
@@ -137,12 +152,14 @@ static int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len,
 static int tpm_tis_spi_read_bytes(struct tpm_tis_data *data, u32 addr,
 				  u16 len, u8 *result)
 {
+	printk(KERN_INFO "read bytes : addr: 0x%04x - len: %d\n", addr, len);
 	return tpm_tis_spi_transfer(data, addr, len, result, NULL);
 }
 
 static int tpm_tis_spi_write_bytes(struct tpm_tis_data *data, u32 addr,
 				   u16 len, const u8 *value)
 {
+	printk(KERN_INFO "write bytes : addr: 0x%04x - len: %d\n", addr, len);
 	return tpm_tis_spi_transfer(data, addr, len, NULL, value);
 }
 
@@ -151,6 +168,7 @@ static int tpm_tis_spi_read16(struct tpm_tis_data *data, u32 addr, u16 *result)
 	__le16 result_le;
 	int rc;
 
+	printk(KERN_INFO "read16  : addr: 0x%04x - len: %d\n", addr, sizeof(u16));
 	rc = data->phy_ops->read_bytes(data, addr, sizeof(u16),
 				       (u8 *)&result_le);
 	if (!rc)
@@ -164,6 +182,7 @@ static int tpm_tis_spi_read32(struct tpm_tis_data *data, u32 addr, u32 *result)
 	__le32 result_le;
 	int rc;
 
+	printk(KERN_INFO "read32  : addr: 0x%04x - len: %d\n", addr, sizeof(u32));
 	rc = data->phy_ops->read_bytes(data, addr, sizeof(u32),
 				       (u8 *)&result_le);
 	if (!rc)
@@ -177,6 +196,7 @@ static int tpm_tis_spi_write32(struct tpm_tis_data *data, u32 addr, u32 value)
 	__le32 value_le;
 	int rc;
 
+	printk(KERN_INFO "write32  : addr: 0x%04x - val: 0x%04x\n", addr, value);
 	value_le = cpu_to_le32(value);
 	rc = data->phy_ops->write_bytes(data, addr, sizeof(u32),
 					(u8 *)&value_le);