usb: storage: Use the correct CBW lengths

USB UFI uses fixed 12-byte commands (as does RBC, which is not
supported), but SCSI does not have this limitation. Use the correct
command block lengths depending on the subclass.

Signed-off-by: Hector Martin <marcan@marcan.st>
Reviewed-by: Marek Vasut <marex@denx.de>

1 files changed, 14 insertions, 8 deletions

diff --git a/common/usb_storage.c b/common/usb_storage.c
index 35c656db0dc..774d5bdf54b 100644
--- a/common/usb_storage.c
+++ b/common/usb_storage.c
@@ -102,6 +102,7 @@ struct us_data {
 	trans_reset	transport_reset;	/* reset routine */
 	trans_cmnd	transport;		/* transport routine */
 	unsigned short	max_xfer_blk;		/* maximum transfer blocks */
+	bool		cmd12;			/* use 12-byte commands (RBC/UFI) */
 };
 
 #if !CONFIG_IS_ENABLED(BLK)
@@ -359,7 +360,7 @@ static void usb_show_srb(struct scsi_cmd *pccb)
 {
 	int i;
 	printf("SRB: len %d datalen 0x%lX\n ", pccb->cmdlen, pccb->datalen);
-	for (i = 0; i < 12; i++)
+	for (i = 0; i < pccb->cmdlen; i++)
 		printf("%02X ", pccb->cmd[i]);
 	printf("\n");
 }
@@ -898,7 +899,7 @@ do_retry:
 	psrb->cmd[4] = 18;
 	psrb->datalen = 18;
 	psrb->pdata = &srb->sense_buf[0];
-	psrb->cmdlen = 12;
+	psrb->cmdlen = us->cmd12 ? 12 : 6;
 	/* issue the command */
 	result = usb_stor_CB_comdat(psrb, us);
 	debug("auto request returned %d\n", result);
@@ -999,7 +1000,7 @@ static int usb_inquiry(struct scsi_cmd *srb, struct us_data *ss)
 		srb->cmd[1] = srb->lun << 5;
 		srb->cmd[4] = 36;
 		srb->datalen = 36;
-		srb->cmdlen = 12;
+		srb->cmdlen = ss->cmd12 ? 12 : 6;
 		i = ss->transport(srb, ss);
 		debug("inquiry returns %d\n", i);
 		if (i == 0)
@@ -1024,7 +1025,7 @@ static int usb_request_sense(struct scsi_cmd *srb, struct us_data *ss)
 	srb->cmd[4] = 18;
 	srb->datalen = 18;
 	srb->pdata = &srb->sense_buf[0];
-	srb->cmdlen = 12;
+	srb->cmdlen = ss->cmd12 ? 12 : 6;
 	ss->transport(srb, ss);
 	debug("Request Sense returned %02X %02X %02X\n",
 	      srb->sense_buf[2], srb->sense_buf[12],
@@ -1042,7 +1043,7 @@ static int usb_test_unit_ready(struct scsi_cmd *srb, struct us_data *ss)
 		srb->cmd[0] = SCSI_TST_U_RDY;
 		srb->cmd[1] = srb->lun << 5;
 		srb->datalen = 0;
-		srb->cmdlen = 12;
+		srb->cmdlen = ss->cmd12 ? 12 : 6;
 		if (ss->transport(srb, ss) == USB_STOR_TRANSPORT_GOOD) {
 			ss->flags |= USB_READY;
 			return 0;
@@ -1074,7 +1075,7 @@ static int usb_read_capacity(struct scsi_cmd *srb, struct us_data *ss)
 		srb->cmd[0] = SCSI_RD_CAPAC;
 		srb->cmd[1] = srb->lun << 5;
 		srb->datalen = 8;
-		srb->cmdlen = 12;
+		srb->cmdlen = ss->cmd12 ? 12 : 10;
 		if (ss->transport(srb, ss) == USB_STOR_TRANSPORT_GOOD)
 			return 0;
 	} while (retry--);
@@ -1094,7 +1095,7 @@ static int usb_read_10(struct scsi_cmd *srb, struct us_data *ss,
 	srb->cmd[5] = ((unsigned char) (start)) & 0xff;
 	srb->cmd[7] = ((unsigned char) (blocks >> 8)) & 0xff;
 	srb->cmd[8] = (unsigned char) blocks & 0xff;
-	srb->cmdlen = 12;
+	srb->cmdlen = ss->cmd12 ? 12 : 10;
 	debug("read10: start %lx blocks %x\n", start, blocks);
 	return ss->transport(srb, ss);
 }
@@ -1111,7 +1112,7 @@ static int usb_write_10(struct scsi_cmd *srb, struct us_data *ss,
 	srb->cmd[5] = ((unsigned char) (start)) & 0xff;
 	srb->cmd[7] = ((unsigned char) (blocks >> 8)) & 0xff;
 	srb->cmd[8] = (unsigned char) blocks & 0xff;
-	srb->cmdlen = 12;
+	srb->cmdlen = ss->cmd12 ? 12 : 10;
 	debug("write10: start %lx blocks %x\n", start, blocks);
 	return ss->transport(srb, ss);
 }
@@ -1417,6 +1418,11 @@ int usb_storage_probe(struct usb_device *dev, unsigned int ifnum,
 		printf("Sorry, protocol %d not yet supported.\n", ss->subclass);
 		return 0;
 	}
+
+	/* UFI uses 12-byte commands (like RBC, unlike SCSI) */
+	if (ss->subclass == US_SC_UFI)
+		ss->cmd12 = true;
+
 	if (ss->ep_int) {
 		/* we had found an interrupt endpoint, prepare irq pipe
 		 * set up the IRQ pipe and handler