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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.h
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@@ -193,7 +193,6 @@ struct ehci_hcd { /* one per controller */
unsigned has_amcc_usb23:1;
unsigned need_io_watchdog:1;
unsigned amd_pll_fix:1;
unsigned fs_i_thresh:1; /* Intel iso scheduling */
unsigned use_dummy_qh:1; /* AMD Frame List table quirk*/
unsigned has_synopsys_hc_bug:1; /* Synopsys HC */
unsigned frame_index_bug:1; /* MosChip (AKA NetMos) */