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EHCI: use the isochronous scheduling threshold

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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>
This commit is contained in:
Alan Stern
2012-09-28 16:01:34 -04:00
committed by Greg Kroah-Hartman
parent c3ee9b76aa
commit 98cae42d82
4 changed files with 5 additions and 11 deletions
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1
drivers/usb/host/ehci-pci.c
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@@ -103,7 +103,6 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
}
break;
case PCI_VENDOR_ID_INTEL:
ehci->fs_i_thresh = 1;
if (pdev->device == PCI_DEVICE_ID_INTEL_CE4100_USB)
hcd->has_tt = 1;
break;