[PATCH] USB: ehci-hcd micro-patch

This is a handful of one-liners, significantly:

  - don't disable "park" feature (faster).
  - cut'n'paste should have morphed "||" to "&&"
  - initialize qh as "live" (as now expected)

The "&&" was the most troublesome bug.  It could make
all kinds of things misbehave, not just those vt6202
issues some folks report.

The interesting bit about the "park" feature (NForce2
has it, maybe a few others) is that it made one disk
run 18% faster (according to hdparm).

drivers/usb/host/ehci-hcd.c

@@ -431,7 +431,7 @@ static int ehci_start (struct usb_hcd *hcd)
 	pci_set_mwi (ehci->hcd.pdev);
 
 	/* clear interrupt enables, set irq latency */
-	temp = readl (&ehci->regs->command) & 0xff;
+	temp = readl (&ehci->regs->command) & 0x0fff;
 	if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
 		log2_irq_thresh = 0;
 	temp |= 1 << (16 + log2_irq_thresh);

drivers/usb/host/ehci-q.c

@@ -293,7 +293,7 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh, struct pt_regs *regs)
 
 		/* stop scanning when we reach qtds the hc is using */
 		} else if (likely (!stopped
-				|| HCD_IS_RUNNING (ehci->hcd.state))) {
+				&& HCD_IS_RUNNING (ehci->hcd.state))) {
 			break;
 
 		} else {
@@ -690,12 +690,11 @@ qh_make (
 
 	/* NOTE:  if (PIPE_INTERRUPT) { scheduler sets s-mask } */
 
-	/* init as halted, toggle clear, advance to dummy */
+	/* init as live, toggle clear, advance to dummy */
 	qh->qh_state = QH_STATE_IDLE;
 	qh->hw_info1 = cpu_to_le32 (info1);
 	qh->hw_info2 = cpu_to_le32 (info2);
 	qh_update (ehci, qh, qh->dummy);
-	qh->hw_token = cpu_to_le32 (QTD_STS_HALT);
 	usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1);
 	return qh;
 }