[coreboot-gerrit] Patch merged into coreboot/master: 49ba283 libpayload: xhci: Ensure to reset dequeue pointer on stopped endpoints

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit 49ba28339087cb1057fbb12071a0981013a88e55
Author: Julius Werner <jwerner at chromium.org>
Date:   Thu Sep 26 15:13:44 2013 -0700

    libpayload: xhci: Ensure to reset dequeue pointer on stopped endpoints
    
    This patch fixes a bug in the XHCI stack that occurs when a multi-TRB TD
    times out before the last TRB is processed. The driver will correctly
    issue a Stop Endpoint command in that case, but the xHC will still
    preserve the transfer state and just pick up right after that on the
    next doorbell ring. It will then process the leftover TRBs from the old
    TD the next time a transfer is issued. (cf. XHCI 4.6.9)
    
    We fix this by changing the existing xhci_reset_endpoint() calls in
    transfer functions to not only trigger on Halted (2) and Error (4), but
    also on Stopped (3). That function will not actually issue a Reset
    Endpoint command in this case, but it will nuke the whole transfer ring
    and issue a Set TR Dequeue Pointer command, which is sufficient (though
    slightly overkill) to solve our problem.
    
    Change-Id: I3abbe30ff9d4911a8af1f792324e018d427019e8
    Signed-off-by: Julius Werner <jwerner at chromium.org>
    Reviewed-on: https://chromium-review.googlesource.com/170833
    Reviewed-by: Ronald Minnich <rminnich at chromium.org>
    Reviewed-by: Kees Cook <keescook at chromium.org>
    (cherry picked from commit f12424af0e29ac12963e8e5a7970fadcc0bb6cee)
    Signed-off-by: Isaac Christensen <isaac.christensen at se-eng.com>
    Reviewed-on: http://review.coreboot.org/6787
    Reviewed-by: Stefan Reinauer <stefan.reinauer at coreboot.org>
    Tested-by: build bot (Jenkins)


See http://review.coreboot.org/6787 for details.

-gerrit