Patch merged into coreboot/master: 2de841b usbdebug: Adjust transaction retries

the following patch was just integrated into master:
commit 2de841b355f632bd4cee3f0419dab34ec57ad804
Author: Kyösti Mälkki 
Date:   Mon Aug 19 12:45:16 2013 +0300

usbdebug: Adjust transaction retries

Transaction consistently completes with 80 to 150 status reads on my
    setups. Hardware should always be able to complete this within 125us
    as the debug port is serviced at the beginning of each microframe.

Timeout is set to DBGP_MICROFRAME_TIMEOUT_LOOPS=1000 status reads. Do not
    retry transactions if this timeout is reached as the host controller
    probably needs full re-initialisation to recover.

If this timeout is not reached, but a transaction is corrupted
    on the wire, or it is otherwise not properly delivered to the USB device,
    transaction is retried upto DBGP_MICROFRAME_RETRIES=10 times.

Change-Id: I44bc0a1bd194cdb5a2c13d5b81fc39bc568ae054
    Signed-off-by: Kyösti Mälkki 
    Reviewed-on: http://review.coreboot.org/3881
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin

See http://review.coreboot.org/3881 for details.

-gerrit