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authorAlan Stern <stern@rowland.harvard.edu>2012-09-28 16:01:34 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-10-22 08:57:43 -0700
commit98cae42d82fe9c9e2b5dacdf391edaa007e147e5 (patch)
tree1fc9be10a439d0557d673ca570b48dce3e56df79 /include/linux/usb.h
parentc3ee9b76aa93fbf59727e02fac9914c7355108f3 (diff)
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EHCI: use the isochronous scheduling threshold
This patch (as1609) changes the way ehci-hcd uses the "Isochronous Scheduling Threshold" in its calculations. Until now the code has ignored the threshold except for certain Intel PCI-based controllers. This violates the EHCI spec. The new code takes the threshold into account always, removing the need for the fs_i_thresh quirk flag. In addition it implements the "full frame cache" setting more efficiently, moving forward only as far as the next frame boundary instead of always moving forward 8 microframes. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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