[U-Boot] [PATCH 0/2] common: usb_storage : Implement logic to calculate optimal

[Rajesh Bhagat]

Implements the logic to calculate the optimal usb maximum trasfer blocks
instead of sending USB_MAX_XFER_BLK blocks which is 65535 and 20 in case
of EHCI and other USB protocols respectively

Sample Behaviour: Fallback to 16384 blocks once failure is seen on 32768.

=> usb write a0000000 0 10000;

USB write: device 0 block # 0, count 65536 ... usb_write: retry #2, xfer_blk 4096, smallblks 4096
usb_write: retry #2, xfer_blk 8192, smallblks 8192
usb_write: retry #2, xfer_blk 16384, smallblks 16384
usb_write: retry #2, xfer_blk 32768, smallblks 32768
EHCI timed out on TD - token=0x10008c80
usb_write: retry #1, xfer_blk 16384, smallblks 16384
usb_write: retry #2, xfer_blk 16384, smallblks 16384
usb_write: retry #2, xfer_blk 16384, smallblks 4096
65536 blocks write: OK

Rajesh Bhagat (2):
  common: usb_storage : Implement logic to calculate optimal usb maximum
    trasfer blocks
  common: usb_storage : Seperate optimal blocks logic calculation for
    read/write

 common/usb_storage.c | 66 +++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 47 insertions(+), 19 deletions(-)

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2.6.2.198.g614a2ac