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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2011-09-13 16:41:13 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-09-20 12:33:50 -0700
commit2b69899934c63b7b9432568584fb4c4a2924f40c (patch)
treefd857f901beaf7c60b7015422aa5bc85e4a8eebe /drivers/usb/core/hub.c
parent170c026347c867a71e27713b98c58b266146c468 (diff)
xhci: USB 3.0 BW checking.
The Intel Panther Point xHCI host tracks SuperSpeed endpoints in a different way than USB 2.0/1.1 endpoints. The bandwidth interval tables are not used, and instead the bandwidth is calculated in a very simple way. Bandwidth for SuperSpeed endpoints is tracked individually in each direction, since each direction has the full USB 3.0 bandwidth available. 10% of the bus bandwidth is reserved for non-periodic transfers. This checking would be more complex if we had USB 3.0 LPM enabled, because an additional latency for isochronous ping times need to be taken into account. However, we don't have USB 3.0 LPM support in Linux yet. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/hub.c')
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