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| author | Alan Stern <stern@rowland.harvard.edu> | 2012-09-28 22:01:34 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-22 17:57:43 +0200 |
| commit | 98cae42d82fe9c9e2b5dacdf391edaa007e147e5 (patch) | |
| tree | 1fc9be10a439d0557d673ca570b48dce3e56df79 /drivers/usb/host/ehci-hcd.c | |
| parent | EHCI: improved logic for isochronous scheduling (diff) | |
| download | linux-98cae42d82fe9c9e2b5dacdf391edaa007e147e5.tar.xz linux-98cae42d82fe9c9e2b5dacdf391edaa007e147e5.zip | |
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>
Diffstat (limited to 'drivers/usb/host/ehci-hcd.c')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 6bf6c42481e8..61eac96441de 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -503,7 +503,7 @@ static int ehci_init(struct usb_hcd *hcd) /* controllers may cache some of the periodic schedule ... */ if (HCC_ISOC_CACHE(hcc_params)) // full frame cache - ehci->i_thresh = 2 + 8; + ehci->i_thresh = 0; else // N microframes cached ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params); |