[050/200] USB: EHCI: fix controller wakeup flag settings during suspend

From: Greg KH
Date: Thu Jul 01 2010 - 17:56:11 EST

2.6.34-stable review patch. If anyone has any objections, please let me know.

------------------

From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>

commit 16032c4f5b291af541e9114a09ea20ff5a0dc474 upstream.

This patch (as1380) fixes a bug in the wakeup settings for EHCI host
controllers. When the controller is suspended, if it isn't enabled
for remote wakeup then we have to turn off all the port wakeup flags.
Disabling PCI PME# isn't good enough, because some systems (Intel)
evidently use alternate wakeup signalling paths.

In addition, the patch improves the handling of the Intel Moorestown
hardware by performing various power-up and power-down delays just
once instead of once for each port (i.e., the delays are moved outside
of the port loops). This requires extra code, but the total delay
time is reduced.

There are also a few additional minor cleanups.

Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Reported-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
CC: Alek Du <alek.du@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
drivers/usb/host/ehci-au1xxx.c | 16 ---
drivers/usb/host/ehci-fsl.c | 2
drivers/usb/host/ehci-hub.c | 173 +++++++++++++++++++++++++++++------------
drivers/usb/host/ehci-pci.c | 15 ---
drivers/usb/host/ehci.h | 10 ++
5 files changed, 145 insertions(+), 71 deletions(-)

--- a/drivers/usb/host/ehci-au1xxx.c
+++ b/drivers/usb/host/ehci-au1xxx.c
@@ -215,26 +215,17 @@ static int ehci_hcd_au1xxx_drv_suspend(s
msleep(10);

/* Root hub was already suspended. Disable irq emission and
- * mark HW unaccessible, bail out if RH has been resumed. Use
- * the spinlock to properly synchronize with possible pending
- * RH suspend or resume activity.
- *
- * This is still racy as hcd->state is manipulated outside of
- * any locks =P But that will be a different fix.
+ * mark HW unaccessible. The PM and USB cores make sure that
+ * the root hub is either suspended or stopped.
*/
spin_lock_irqsave(&ehci->lock, flags);
- if (hcd->state != HC_STATE_SUSPENDED) {
- rc = -EINVAL;
- goto bail;
- }
+ ehci_prepare_ports_for_controller_suspend(ehci);
ehci_writel(ehci, 0, &ehci->regs->intr_enable);
(void)ehci_readl(ehci, &ehci->regs->intr_enable);

clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

au1xxx_stop_ehc();
-
-bail:
spin_unlock_irqrestore(&ehci->lock, flags);

// could save FLADJ in case of Vaux power loss
@@ -264,6 +255,7 @@ static int ehci_hcd_au1xxx_drv_resume(st
if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
int mask = INTR_MASK;

+ ehci_prepare_ports_for_controller_resume(ehci);
if (!hcd->self.root_hub->do_remote_wakeup)
mask &= ~STS_PCD;
ehci_writel(ehci, mask, &ehci->regs->intr_enable);
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -313,6 +313,7 @@ static int ehci_fsl_drv_suspend(struct d
struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
void __iomem *non_ehci = hcd->regs;

+ ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd));
if (!fsl_deep_sleep())
return 0;

@@ -327,6 +328,7 @@ static int ehci_fsl_drv_resume(struct de
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
void __iomem *non_ehci = hcd->regs;

+ ehci_prepare_ports_for_controller_resume(ehci);
if (!fsl_deep_sleep())
return 0;

--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -106,12 +106,75 @@ static void ehci_handover_companion_port
ehci->owned_ports = 0;
}

+static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
+ bool suspending)
+{
+ int port;
+ u32 temp;
+
+ /* If remote wakeup is enabled for the root hub but disabled
+ * for the controller, we must adjust all the port wakeup flags
+ * when the controller is suspended or resumed. In all other
+ * cases they don't need to be changed.
+ */
+ if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup ||
+ device_may_wakeup(ehci_to_hcd(ehci)->self.controller))
+ return;
+
+ /* clear phy low-power mode before changing wakeup flags */
+ if (ehci->has_hostpc) {
+ port = HCS_N_PORTS(ehci->hcs_params);
+ while (port--) {
+ u32 __iomem *hostpc_reg;
+
+ hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
+ + HOSTPC0 + 4 * port);
+ temp = ehci_readl(ehci, hostpc_reg);
+ ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
+ }
+ msleep(5);
+ }
+
+ port = HCS_N_PORTS(ehci->hcs_params);
+ while (port--) {
+ u32 __iomem *reg = &ehci->regs->port_status[port];
+ u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
+ u32 t2 = t1 & ~PORT_WAKE_BITS;
+
+ /* If we are suspending the controller, clear the flags.
+ * If we are resuming the controller, set the wakeup flags.
+ */
+ if (!suspending) {
+ if (t1 & PORT_CONNECT)
+ t2 |= PORT_WKOC_E | PORT_WKDISC_E;
+ else
+ t2 |= PORT_WKOC_E | PORT_WKCONN_E;
+ }
+ ehci_vdbg(ehci, "port %d, %08x -> %08x\n",
+ port + 1, t1, t2);
+ ehci_writel(ehci, t2, reg);
+ }
+
+ /* enter phy low-power mode again */
+ if (ehci->has_hostpc) {
+ port = HCS_N_PORTS(ehci->hcs_params);
+ while (port--) {
+ u32 __iomem *hostpc_reg;
+
+ hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
+ + HOSTPC0 + 4 * port);
+ temp = ehci_readl(ehci, hostpc_reg);
+ ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
+ }
+ }
+}
+
static int ehci_bus_suspend (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
int port;
int mask;
- u32 __iomem *hostpc_reg = NULL;
+ int changed;

ehci_dbg(ehci, "suspend root hub\n");

@@ -155,15 +218,13 @@ static int ehci_bus_suspend (struct usb_
*/
ehci->bus_suspended = 0;
ehci->owned_ports = 0;
+ changed = 0;
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *reg = &ehci->regs->port_status [port];
u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
- u32 t2 = t1;
+ u32 t2 = t1 & ~PORT_WAKE_BITS;

- if (ehci->has_hostpc)
- hostpc_reg = (u32 __iomem *)((u8 *)ehci->regs
- + HOSTPC0 + 4 * (port & 0xff));
/* keep track of which ports we suspend */
if (t1 & PORT_OWNER)
set_bit(port, &ehci->owned_ports);
@@ -172,40 +233,45 @@ static int ehci_bus_suspend (struct usb_
set_bit(port, &ehci->bus_suspended);
}

- /* enable remote wakeup on all ports */
+ /* enable remote wakeup on all ports, if told to do so */
if (hcd->self.root_hub->do_remote_wakeup) {
/* only enable appropriate wake bits, otherwise the
* hardware can not go phy low power mode. If a race
* condition happens here(connection change during bits
* set), the port change detection will finally fix it.
*/
- if (t1 & PORT_CONNECT) {
+ if (t1 & PORT_CONNECT)
t2 |= PORT_WKOC_E | PORT_WKDISC_E;
- t2 &= ~PORT_WKCONN_E;
- } else {
+ else
t2 |= PORT_WKOC_E | PORT_WKCONN_E;
- t2 &= ~PORT_WKDISC_E;
- }
- } else
- t2 &= ~PORT_WAKE_BITS;
+ }

if (t1 != t2) {
ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
port + 1, t1, t2);
ehci_writel(ehci, t2, reg);
- if (hostpc_reg) {
- u32 t3;
+ changed = 1;
+ }
+ }

- spin_unlock_irq(&ehci->lock);
- msleep(5);/* 5ms for HCD enter low pwr mode */
- spin_lock_irq(&ehci->lock);
- t3 = ehci_readl(ehci, hostpc_reg);
- ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
- t3 = ehci_readl(ehci, hostpc_reg);
- ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
+ if (changed && ehci->has_hostpc) {
+ spin_unlock_irq(&ehci->lock);
+ msleep(5); /* 5 ms for HCD to enter low-power mode */
+ spin_lock_irq(&ehci->lock);
+
+ port = HCS_N_PORTS(ehci->hcs_params);
+ while (port--) {
+ u32 __iomem *hostpc_reg;
+ u32 t3;
+
+ hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
+ + HOSTPC0 + 4 * port);
+ t3 = ehci_readl(ehci, hostpc_reg);
+ ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
+ t3 = ehci_readl(ehci, hostpc_reg);
+ ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
port, (t3 & HOSTPC_PHCD) ?
"succeeded" : "failed");
- }
}
}

@@ -291,19 +357,28 @@ static int ehci_bus_resume (struct usb_h
msleep(8);
spin_lock_irq(&ehci->lock);

+ /* clear phy low-power mode before resume */
+ if (ehci->bus_suspended && ehci->has_hostpc) {
+ i = HCS_N_PORTS(ehci->hcs_params);
+ while (i--) {
+ if (test_bit(i, &ehci->bus_suspended)) {
+ u32 __iomem *hostpc_reg;
+
+ hostpc_reg = (u32 __iomem *)((u8 *) ehci->regs
+ + HOSTPC0 + 4 * i);
+ temp = ehci_readl(ehci, hostpc_reg);
+ ehci_writel(ehci, temp & ~HOSTPC_PHCD,
+ hostpc_reg);
+ }
+ }
+ spin_unlock_irq(&ehci->lock);
+ msleep(5);
+ spin_lock_irq(&ehci->lock);
+ }
+
/* manually resume the ports we suspended during bus_suspend() */
i = HCS_N_PORTS (ehci->hcs_params);
while (i--) {
- /* clear phy low power mode before resume */
- if (ehci->has_hostpc) {
- u32 __iomem *hostpc_reg =
- (u32 __iomem *)((u8 *)ehci->regs
- + HOSTPC0 + 4 * (i & 0xff));
- temp = ehci_readl(ehci, hostpc_reg);
- ehci_writel(ehci, temp & ~HOSTPC_PHCD,
- hostpc_reg);
- mdelay(5);
- }
temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
if (test_bit(i, &ehci->bus_suspended) &&
@@ -685,23 +760,25 @@ static int ehci_hub_control (
goto error;
if (ehci->no_selective_suspend)
break;
- if (temp & PORT_SUSPEND) {
- if ((temp & PORT_PE) == 0)
- goto error;
- /* clear phy low power mode before resume */
- if (hostpc_reg) {
- temp1 = ehci_readl(ehci, hostpc_reg);
- ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
+ if (!(temp & PORT_SUSPEND))
+ break;
+ if ((temp & PORT_PE) == 0)
+ goto error;
+
+ /* clear phy low-power mode before resume */
+ if (hostpc_reg) {
+ temp1 = ehci_readl(ehci, hostpc_reg);
+ ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
hostpc_reg);
- mdelay(5);
- }
- /* resume signaling for 20 msec */
- temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
- ehci_writel(ehci, temp | PORT_RESUME,
- status_reg);
- ehci->reset_done [wIndex] = jiffies
- + msecs_to_jiffies (20);
+ spin_unlock_irqrestore(&ehci->lock, flags);
+ msleep(5);/* wait to leave low-power mode */
+ spin_lock_irqsave(&ehci->lock, flags);
}
+ /* resume signaling for 20 msec */
+ temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
+ ehci_writel(ehci, temp | PORT_RESUME, status_reg);
+ ehci->reset_done[wIndex] = jiffies
+ + msecs_to_jiffies(20);
break;
case USB_PORT_FEAT_C_SUSPEND:
clear_bit(wIndex, &ehci->port_c_suspend);
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -284,23 +284,15 @@ static int ehci_pci_suspend(struct usb_h
msleep(10);

/* Root hub was already suspended. Disable irq emission and
- * mark HW unaccessible, bail out if RH has been resumed. Use
- * the spinlock to properly synchronize with possible pending
- * RH suspend or resume activity.
- *
- * This is still racy as hcd->state is manipulated outside of
- * any locks =P But that will be a different fix.
+ * mark HW unaccessible. The PM and USB cores make sure that
+ * the root hub is either suspended or stopped.
*/
spin_lock_irqsave (&ehci->lock, flags);
- if (hcd->state != HC_STATE_SUSPENDED) {
- rc = -EINVAL;
- goto bail;
- }
+ ehci_prepare_ports_for_controller_suspend(ehci);
ehci_writel(ehci, 0, &ehci->regs->intr_enable);
(void)ehci_readl(ehci, &ehci->regs->intr_enable);

clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
- bail:
spin_unlock_irqrestore (&ehci->lock, flags);

// could save FLADJ in case of Vaux power loss
@@ -330,6 +322,7 @@ static int ehci_pci_resume(struct usb_hc
!hibernated) {
int mask = INTR_MASK;

+ ehci_prepare_ports_for_controller_resume(ehci);
if (!hcd->self.root_hub->do_remote_wakeup)
mask &= ~STS_PCD;
ehci_writel(ehci, mask, &ehci->regs->intr_enable);
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -536,6 +536,16 @@ struct ehci_fstn {

/*-------------------------------------------------------------------------*/

+/* Prepare the PORTSC wakeup flags during controller suspend/resume */
+
+#define ehci_prepare_ports_for_controller_suspend(ehci) \
+ ehci_adjust_port_wakeup_flags(ehci, true);
+
+#define ehci_prepare_ports_for_controller_resume(ehci) \
+ ehci_adjust_port_wakeup_flags(ehci, false);
+
+/*-------------------------------------------------------------------------*/
+
#ifdef CONFIG_USB_EHCI_ROOT_HUB_TT

/*


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