add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/usb/host/ehci-sched.c
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@@ -307,26 +307,6 @@
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 #ifdef CONFIG_USB_EHCI_TT_NEWSCHED
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-/* Which uframe does the low/fullspeed transfer start in?
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- *
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- * The parameter is the mask of ssplits in "H-frame" terms
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- * and this returns the transfer start uframe in "B-frame" terms,
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- * which allows both to match, e.g. a ssplit in "H-frame" uframe 0
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- * will cause a transfer in "B-frame" uframe 0.  "B-frames" lag
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- * "H-frames" by 1 uframe.  See the EHCI spec sec 4.5 and figure 4.7.
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- */
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-static inline unsigned char tt_start_uframe(struct ehci_hcd *ehci, __hc32 mask)
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-{
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-	unsigned char smask = hc32_to_cpu(ehci, mask) & QH_SMASK;
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-
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-	if (!smask) {
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-		ehci_err(ehci, "invalid empty smask!\n");
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-		/* uframe 7 can't have bw so this will indicate failure */
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-		return 7;
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-	}
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-	return ffs(smask) - 1;
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-}
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-
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 static const unsigned char
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 max_tt_usecs[] = { 125, 125, 125, 125, 125, 125, 30, 0 };
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@@ -2475,7 +2455,7 @@
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 			ehci_dbg(ehci, "corrupt type %d frame %d shadow %p\n",
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 					type, frame, q.ptr);
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 			/* BUG(); */
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-			/* FALL THROUGH */
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+			fallthrough;
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 		case Q_TYPE_QH:
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 		case Q_TYPE_FSTN:
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 			/* End of the iTDs and siTDs */