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From: Andrew Thompson <thompsa@FreeBSD.org>
Date: Sun, 4 Oct 2009 19:03:32 +0000 (UTC)
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X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sys/dev/usb/controller ehci.c
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thompsa     2009-10-04 19:03:32 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/dev/usb/controller ehci.c 
  Log:
  SVN rev 197751 on 2009-10-04 19:03:32Z by thompsa
  
  MFC r197682
  
   EHCI Hardware BUG workaround
  
   The EHCI HW can use the qtd_next field instead of qtd_altnext when a short
   packet is received. This contradicts what is stated in the EHCI datasheet.
   Also the total-bytes field in the status field of the following TD gets
   corrupted upon reception of a short packet!  We work this around in software by
   not queueing more than one job/TD at a time of up to 16Kbytes! The bug has been
   seen on multiple INTEL based EHCI chips.  Other vendors have not been tested
   yet.
  
   - Applications using /dev/usb/X.Y.Z, where Z is non-zero are affected, but not
     applications using LibUSB v0.1, v1.2 and v2.0.
   - Mass Storage (umass) is affected.
  
  Approved by:    re (kib)
  
  Revision  Changes    Path
  1.26.2.2  +57 -21    src/sys/dev/usb/controller/ehci.c