[U-Boot] [PATCH 3/5] usb_storage: Remove EHCI constraints

[Benoît Thébaudeau]

Now that the EHCI driver allocates its qTDs from the heap, the MSC driver is
only limited by the SCSI commands it uses.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau at advansee.com>
Cc: Marek Vasut <marex at denx.de>
Cc: Ilya Yanok <ilya.yanok at cogentembedded.com>
Cc: Stefan Herbrechtsmeier <stefan at herbrechtsmeier.net>
---
 .../common/usb_storage.c                           |   31 +++++++++-----------
 1 file changed, 14 insertions(+), 17 deletions(-)

diff --git u-boot-usb-1b4bd0e.orig/common/usb_storage.c u-boot-usb-1b4bd0e/common/usb_storage.c
index bdc306f..46f6b75 100644
--- u-boot-usb-1b4bd0e.orig/common/usb_storage.c
+++ u-boot-usb-1b4bd0e/common/usb_storage.c
@@ -156,10 +156,11 @@ struct us_data {
 };
 
 /*
- * The U-Boot EHCI driver cannot handle more than 5 page aligned buffers
- * of 4096 bytes in a transfer without running itself out of qt_buffers
+ * The U-Boot EHCI driver can handle any transfer length as long as there is
+ * enough free heap space left, but the SCSI READ(10) and WRITE(10) commands are
+ * limited to 65535 bytes.
  */
-#define USB_MAX_XFER_BLK(start, blksz)	(((4096 * 5) - (start % 4096)) / blksz)
+#define USB_MAX_XFER_BLK 65535
 
 static struct us_data usb_stor[USB_MAX_STOR_DEV];
 
@@ -1046,7 +1047,7 @@ static void usb_bin_fixup(struct usb_device_descriptor descriptor,
 unsigned long usb_stor_read(int device, unsigned long blknr,
 			    unsigned long blkcnt, void *buffer)
 {
-	unsigned long start, blks, buf_addr, max_xfer_blk;
+	unsigned long start, blks, buf_addr;
 	unsigned short smallblks;
 	struct usb_device *dev;
 	struct us_data *ss;
@@ -1088,14 +1089,12 @@ unsigned long usb_stor_read(int device, unsigned long blknr,
 		/* XXX need some comment here */
 		retry = 2;
 		srb->pdata = (unsigned char *)buf_addr;
-		max_xfer_blk = USB_MAX_XFER_BLK(buf_addr,
-						usb_dev_desc[device].blksz);
-		if (blks > max_xfer_blk)
-			smallblks = (unsigned short) max_xfer_blk;
+		if (blks > USB_MAX_XFER_BLK)
+			smallblks = USB_MAX_XFER_BLK;
 		else
 			smallblks = (unsigned short) blks;
 retry_it:
-		if (smallblks == max_xfer_blk)
+		if (smallblks == USB_MAX_XFER_BLK)
 			usb_show_progress();
 		srb->datalen = usb_dev_desc[device].blksz * smallblks;
 		srb->pdata = (unsigned char *)buf_addr;
@@ -1116,7 +1115,7 @@ retry_it:
 			start, smallblks, buf_addr);
 
 	usb_disable_asynch(0); /* asynch transfer allowed */
-	if (blkcnt >= max_xfer_blk)
+	if (blkcnt >= USB_MAX_XFER_BLK)
 		debug("\n");
 	return blkcnt;
 }
@@ -1124,7 +1123,7 @@ retry_it:
 unsigned long usb_stor_write(int device, unsigned long blknr,
 				unsigned long blkcnt, const void *buffer)
 {
-	unsigned long start, blks, buf_addr, max_xfer_blk;
+	unsigned long start, blks, buf_addr;
 	unsigned short smallblks;
 	struct usb_device *dev;
 	struct us_data *ss;
@@ -1169,14 +1168,12 @@ unsigned long usb_stor_write(int device, unsigned long blknr,
 		 */
 		retry = 2;
 		srb->pdata = (unsigned char *)buf_addr;
-		max_xfer_blk = USB_MAX_XFER_BLK(buf_addr,
-						usb_dev_desc[device].blksz);
-		if (blks > max_xfer_blk)
-			smallblks = (unsigned short) max_xfer_blk;
+		if (blks > USB_MAX_XFER_BLK)
+			smallblks = USB_MAX_XFER_BLK;
 		else
 			smallblks = (unsigned short) blks;
 retry_it:
-		if (smallblks == max_xfer_blk)
+		if (smallblks == USB_MAX_XFER_BLK)
 			usb_show_progress();
 		srb->datalen = usb_dev_desc[device].blksz * smallblks;
 		srb->pdata = (unsigned char *)buf_addr;
@@ -1197,7 +1194,7 @@ retry_it:
 			start, smallblks, buf_addr);
 
 	usb_disable_asynch(0); /* asynch transfer allowed */
-	if (blkcnt >= max_xfer_blk)
+	if (blkcnt >= USB_MAX_XFER_BLK)
 		debug("\n");
 	return blkcnt;