Revert "USB: EHCI cpufreq fix"

This reverts commit 196705c9bbc03540429b0f7cf9ee35c2f928a534.  It was
reported to cause a regression by Daniel Exner, and Arjan van de Ven
points out that we actually already have infrastructure in place for
setting limits on acceptable DMA latency that would be the much more
correct fix for the problem with some Broadcom EHCI controllers.

Fixed up trivial conflicts due to the changes to support big-endian host
controller descriptors in drivers/usb/host/{ehci-sched.c,ehci.h}.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 67 deletions

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index c4e15ed1405a..35cdba10411b 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -275,58 +275,6 @@ static void ehci_work(struct ehci_hcd *ehci);
 
 /*-------------------------------------------------------------------------*/
 
-#ifdef CONFIG_CPU_FREQ
-
-#include <linux/cpufreq.h>
-
-static void ehci_cpufreq_pause (struct ehci_hcd *ehci)
-{
-	unsigned long	flags;
-
-	spin_lock_irqsave(&ehci->lock, flags);
-	if (!ehci->cpufreq_changing++)
-		qh_inactivate_split_intr_qhs(ehci);
-	spin_unlock_irqrestore(&ehci->lock, flags);
-}
-
-static void ehci_cpufreq_unpause (struct ehci_hcd *ehci)
-{
-	unsigned long	flags;
-
-	spin_lock_irqsave(&ehci->lock, flags);
-	if (!--ehci->cpufreq_changing)
-		qh_reactivate_split_intr_qhs(ehci);
-	spin_unlock_irqrestore(&ehci->lock, flags);
-}
-
-/*
- * ehci_cpufreq_notifier is needed to avoid MMF errors that occur when
- * EHCI controllers that don't cache many uframes get delayed trying to
- * read main memory during CPU frequency transitions.  This can cause
- * split interrupt transactions to not be completed in the required uframe.
- * This has been observed on the Broadcom/ServerWorks HT1000 controller.
- */
-static int ehci_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
-				 void *data)
-{
-	struct ehci_hcd *ehci = container_of(nb, struct ehci_hcd,
-					     cpufreq_transition);
-
-	switch (val) {
-	case CPUFREQ_PRECHANGE:
-		ehci_cpufreq_pause(ehci);
-		break;
-	case CPUFREQ_POSTCHANGE:
-		ehci_cpufreq_unpause(ehci);
-		break;
-	}
-	return 0;
-}
-
-#endif
-
-/*-------------------------------------------------------------------------*/
-
 static void ehci_watchdog (unsigned long param)
 {
 	struct ehci_hcd		*ehci = (struct ehci_hcd *) param;
@@ -460,10 +408,6 @@ static void ehci_stop (struct usb_hcd *hcd)
 	ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 	spin_unlock_irq(&ehci->lock);
 
-#ifdef CONFIG_CPU_FREQ
-	cpufreq_unregister_notifier(&ehci->cpufreq_transition,
-				    CPUFREQ_TRANSITION_NOTIFIER);
-#endif
 	/* let companion controllers work when we aren't */
 	ehci_writel(ehci, 0, &ehci->regs->configured_flag);
 
@@ -569,17 +513,6 @@ static int ehci_init(struct usb_hcd *hcd)
 	}
 	ehci->command = temp;
 
-#ifdef CONFIG_CPU_FREQ
-	INIT_LIST_HEAD(&ehci->split_intr_qhs);
-	/*
-	 * If the EHCI controller caches enough uframes, this probably
-	 * isn't needed unless there are so many low/full speed devices
-	 * that the controller's can't cache it all.
-	 */
-	ehci->cpufreq_transition.notifier_call = ehci_cpufreq_notifier;
-	cpufreq_register_notifier(&ehci->cpufreq_transition,
-				  CPUFREQ_TRANSITION_NOTIFIER);
-#endif
 	return 0;
 }