Revert "USB: EHCI cpufreq fix"

This reverts commit 196705c9.  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>

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;
 }
 

drivers/usb/host/ehci-mem.c

@@ -94,9 +94,6 @@ static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, gfp_t flags)
 	qh->qh_dma = dma;
 	// INIT_LIST_HEAD (&qh->qh_list);
 	INIT_LIST_HEAD (&qh->qtd_list);
-#ifdef CONFIG_CPU_FREQ
-	INIT_LIST_HEAD (&qh->split_intr_qhs);
-#endif
 
 	/* dummy td enables safe urb queuing */
 	qh->dummy = ehci_qtd_alloc (ehci, flags);

drivers/usb/host/ehci-q.c

@@ -312,10 +312,6 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
 		struct urb	*urb;
 		u32		token = 0;
 
-		/* ignore QHs that are currently inactive */
-		if (qh->hw_info1 & __constant_cpu_to_le32(QH_INACTIVATE))
-			break;
-
 		qtd = list_entry (entry, struct ehci_qtd, qtd_list);
 		urb = qtd->urb;
 

drivers/usb/host/ehci-sched.c

@@ -479,109 +479,6 @@ static int disable_periodic (struct ehci_hcd *ehci)
 }
 
 /*-------------------------------------------------------------------------*/
-#ifdef CONFIG_CPU_FREQ
-
-static int safe_to_modify_i (struct ehci_hcd *ehci, struct ehci_qh *qh)
-{
-	int now; /* current (frame * 8) + uframe */
-	int prev_start, next_start; /* uframes from/to split start */
-	int start_uframe = ffs(le32_to_cpup (&qh->hw_info2) & QH_SMASK);
-	int end_uframe = fls((le32_to_cpup (&qh->hw_info2) & QH_CMASK) >> 8);
-	int split_duration = end_uframe - start_uframe;
-
-	now = readl(&ehci->regs->frame_index) % (ehci->periodic_size << 3);
-
-	next_start = ((1024 << 3) + (qh->start << 3) + start_uframe - now)
-			% (qh->period << 3);
-	prev_start = (qh->period << 3) - next_start;
-
-	/*
-	 * Make sure there will be at least one uframe when qh is safe.
-	 */
-	if ((qh->period << 3) <= (ehci->i_thresh + 2 + split_duration))
-		/* never safe */
-		return -EINVAL;
-
-	/*
-	 * Wait 1 uframe after transaction should have started, to make
-	 * sure controller has time to write back overlay, so we can
-	 * check QTD_STS_STS to see if transaction is in progress.
-	 */
-	if ((next_start > ehci->i_thresh) && (prev_start > 1))
-		/* safe to set "i" bit if split isn't in progress */
-		return (qh->hw_token & STATUS_BIT(ehci)) ? 0 : 1;
-	else
-		return 0;
-}
-
-/* Set inactivate bit for all the split interrupt QHs. */
-static void qh_inactivate_split_intr_qhs (struct ehci_hcd *ehci)
-{
-	struct ehci_qh	*qh;
-	int		not_done, safe;
-	u32		inactivate = INACTIVATE_BIT(ehci);
-	u32		active = ACTIVE_BIT(ehci);
-
-	do {
-		not_done = 0;
-		list_for_each_entry(qh, &ehci->split_intr_qhs,
-				split_intr_qhs) {
-			if (qh->hw_info1 & inactivate)
-				/* already off */
-				continue;
-			/*
-			 * To avoid setting "I" after the start split happens,
-			 * don't set it if the QH might be cached in the
-			 * controller.  Some HCs (Broadcom/ServerWorks HT1000)
-			 * will stop in the middle of a split transaction when
-			 * the "I" bit is set.
-			 */
-			safe = safe_to_modify_i(ehci, qh);
-			if (safe == 0) {
-				not_done = 1;
-			} else if (safe > 0) {
-				qh->was_active = qh->hw_token & active;
-				qh->hw_info1 |= inactivate;
-			}
-		}
-	} while (not_done);
-	wmb();
-}
-
-static void qh_reactivate_split_intr_qhs (struct ehci_hcd *ehci)
-{
-	struct ehci_qh	*qh;
-	u32		token;
-	int		not_done, safe;
-	u32		inactivate = INACTIVATE_BIT(ehci);
-	u32		active = ACTIVE_BIT(ehci);
-	u32		halt = HALT_BIT(ehci);
-
-	do {
-		not_done = 0;
-		list_for_each_entry(qh, &ehci->split_intr_qhs, split_intr_qhs) {
-			if (!(qh->hw_info1 & inactivate)) /* already on */
-				continue;
-			/*
-			 * Don't reactivate if cached, or controller might
-			 * overwrite overlay after we modify it!
-			 */
-			safe = safe_to_modify_i(ehci, qh);
-			if (safe == 0) {
-				not_done = 1;
-			} else if (safe > 0) {
-				/* See EHCI 1.0 section 4.15.2.4. */
-				token = qh->hw_token;
-				qh->hw_token = (token | halt) & ~active;
-				wmb();
-				qh->hw_info1 &= ~inactivate;
-				wmb();
-				qh->hw_token = (token & ~halt) | qh->was_active;
-			}
-		}
-	} while (not_done);
-}
-#endif
 
 /* periodic schedule slots have iso tds (normal or split) first, then a
  * sparse tree for active interrupt transfers.
@@ -599,17 +496,6 @@ static int qh_link_periodic (struct ehci_hcd *ehci, struct ehci_qh *qh)
 		period, hc32_to_cpup(ehci, &qh->hw_info2) & (QH_CMASK | QH_SMASK),
 		qh, qh->start, qh->usecs, qh->c_usecs);
 
-#ifdef CONFIG_CPU_FREQ
-	/*
-	 * If low/full speed interrupt QHs are inactive (because of
-	 * cpufreq changing processor speeds), start QH with I flag set--
-	 * it will automatically be cleared when cpufreq is done.
-	 */
-	if (ehci->cpufreq_changing)
-		if (!(qh->hw_info1 & (cpu_to_le32(1 << 13))))
-			qh->hw_info1 |= INACTIVATE_BIT(ehci);
-#endif
-
 	/* high bandwidth, or otherwise every microframe */
 	if (period == 0)
 		period = 1;
@@ -658,12 +544,6 @@ static int qh_link_periodic (struct ehci_hcd *ehci, struct ehci_qh *qh)
 		? ((qh->usecs + qh->c_usecs) / qh->period)
 		: (qh->usecs * 8);
 
-#ifdef CONFIG_CPU_FREQ
-	/* add qh to list of low/full speed interrupt QHs, if applicable */
-	if (!(qh->hw_info1 & (cpu_to_le32(1 << 13)))) {
-		list_add(&qh->split_intr_qhs, &ehci->split_intr_qhs);
-	}
-#endif
 	/* maybe enable periodic schedule processing */
 	if (!ehci->periodic_sched++)
 		return enable_periodic (ehci);
@@ -683,13 +563,6 @@ static void qh_unlink_periodic (struct ehci_hcd *ehci, struct ehci_qh *qh)
 	// THEN
 	//   qh->hw_info1 |= __constant_cpu_to_hc32(1 << 7 /* "ignore" */);
 
-#ifdef CONFIG_CPU_FREQ
-	/* remove qh from list of low/full speed interrupt QHs */
-	if (!(qh->hw_info1 & (cpu_to_le32(1 << 13)))) {
-		list_del_init(&qh->split_intr_qhs);
-	}
-#endif
-
 	/* high bandwidth, or otherwise part of every microframe */
 	if ((period = qh->period) == 0)
 		period = 1;

drivers/usb/host/ehci.h

@@ -71,12 +71,6 @@ struct ehci_hcd {			/* one per controller */
 	__u32			hcs_params;	/* cached register copy */
 	spinlock_t		lock;
 
-#ifdef CONFIG_CPU_FREQ
-	struct notifier_block	cpufreq_transition;
-	int			cpufreq_changing;
-	struct list_head	split_intr_qhs;
-#endif
-
 	/* async schedule support */
 	struct ehci_qh		*async;
 	struct ehci_qh		*reclaim;
@@ -439,10 +433,6 @@ struct ehci_qh {
 	__hc32			hw_next;	/* see EHCI 3.6.1 */
 	__hc32			hw_info1;       /* see EHCI 3.6.2 */
 #define	QH_HEAD		0x00008000
-#define	QH_INACTIVATE	0x00000080
-
-#define INACTIVATE_BIT(ehci)	cpu_to_hc32(ehci, QH_INACTIVATE)
-
 	__hc32			hw_info2;        /* see EHCI 3.6.2 */
 #define	QH_SMASK	0x000000ff
 #define	QH_CMASK	0x0000ff00
@@ -492,10 +482,6 @@ struct ehci_qh {
 	unsigned short		start;		/* where polling starts */
 #define NO_FRAME ((unsigned short)~0)			/* pick new start */
 	struct usb_device	*dev;		/* access to TT */
-#ifdef CONFIG_CPU_FREQ
-	struct list_head	split_intr_qhs; /* list of split qhs */
-	__le32			was_active;	/* active bit before "i" set */
-#endif
 } __attribute__ ((aligned (32)));
 
 /*-------------------------------------------------------------------------*/