USB: ehci: minor ISO updates, always support split ISO
Small updates to the EHCI driver's ISO support: - Get rid of the Kconfig option for full speed ISO. It may not be perfect yet, but it hasn't appeared to be dangerous and pretty much every configuration wants it. - Instead of two places to disable an empty periodic schedule after an ISO transfer completes, just have one. - After the periodic schedule is disabled, we can short-circuit the schedule scan ... it can't possibly have more work to do. Assuming a typical config with split iso enabled, the only change in behavior should be almost unobservable: quicker termination of periodic scans when the schedule gets emptied. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -29,15 +29,6 @@ config USB_EHCI_HCD
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To compile this driver as a module, choose M here: the
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module will be called ehci-hcd.
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config USB_EHCI_SPLIT_ISO
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bool "Full speed ISO transactions (EXPERIMENTAL)"
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depends on USB_EHCI_HCD && EXPERIMENTAL
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default n
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---help---
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This code is new and hasn't been used with many different
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EHCI or USB 2.0 transaction translator implementations.
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It should work for ISO-OUT transfers, like audio.
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config USB_EHCI_ROOT_HUB_TT
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bool "Root Hub Transaction Translators (EXPERIMENTAL)"
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depends on USB_EHCI_HCD && EXPERIMENTAL
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@ -1630,16 +1630,12 @@ itd_complete (
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BUG_ON (itd->urb == urb);
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*/
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/* give urb back to the driver ... can be out-of-order */
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/* give urb back to the driver; completion often (re)submits */
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dev = urb->dev;
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ehci_urb_done(ehci, urb, 0);
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retval = true;
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urb = NULL;
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/* defer stopping schedule; completion can submit */
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ehci->periodic_sched--;
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if (unlikely (!ehci->periodic_sched))
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(void) disable_periodic (ehci);
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ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
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if (unlikely (list_empty (&stream->td_list))) {
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@ -1725,8 +1721,6 @@ done:
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return status;
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}
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#ifdef CONFIG_USB_EHCI_SPLIT_ISO
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/*-------------------------------------------------------------------------*/
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/*
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@ -2016,16 +2010,12 @@ sitd_complete (
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BUG_ON (sitd->urb == urb);
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*/
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/* give urb back to the driver */
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/* give urb back to the driver; completion often (re)submits */
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dev = urb->dev;
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ehci_urb_done(ehci, urb, 0);
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retval = true;
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urb = NULL;
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/* defer stopping schedule; completion can submit */
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ehci->periodic_sched--;
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if (!ehci->periodic_sched)
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(void) disable_periodic (ehci);
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ehci_to_hcd(ehci)->self.bandwidth_isoc_reqs--;
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if (list_empty (&stream->td_list)) {
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@ -2108,26 +2098,6 @@ done:
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return status;
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}
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#else
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static inline int
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sitd_submit (struct ehci_hcd *ehci, struct urb *urb, gfp_t mem_flags)
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{
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ehci_dbg (ehci, "split iso support is disabled\n");
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return -ENOSYS;
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}
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static inline unsigned
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sitd_complete (
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struct ehci_hcd *ehci,
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struct ehci_sitd *sitd
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) {
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ehci_err (ehci, "sitd_complete %p?\n", sitd);
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return 0;
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}
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#endif /* USB_EHCI_SPLIT_ISO */
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/*-------------------------------------------------------------------------*/
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static void
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@ -2252,8 +2222,14 @@ restart:
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}
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/* assume completion callbacks modify the queue */
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if (unlikely (modified))
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goto restart;
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if (unlikely (modified)) {
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if (likely(ehci->periodic_sched > 0))
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goto restart;
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/* maybe we can short-circuit this scan! */
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disable_periodic(ehci);
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now_uframe = clock;
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break;
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}
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}
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/* stop when we catch up to the HC */
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@ -2269,7 +2245,8 @@ restart:
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if (now_uframe == clock) {
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unsigned now;
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if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
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if (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state)
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|| ehci->periodic_sched == 0)
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break;
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ehci->next_uframe = now_uframe;
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now = ehci_readl(ehci, &ehci->regs->frame_index) % mod;
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