aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/core/hcd-pci.c11
-rw-r--r--drivers/usb/core/hcd.c40
-rw-r--r--drivers/usb/core/hcd.h2
-rw-r--r--drivers/usb/core/hub.c22
4 files changed, 48 insertions, 27 deletions
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index 29b5b2a6e18..e0afb5ad29e 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -264,14 +264,19 @@ int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
*/
retval = pci_set_power_state (dev, PCI_D3hot);
if (retval == 0) {
- dev_dbg (hcd->self.controller, "--> PCI D3\n");
+ int wake = device_can_wakeup(&hcd->self.root_hub->dev);
+
+ wake = wake && device_may_wakeup(hcd->self.controller);
+
+ dev_dbg (hcd->self.controller, "--> PCI D3%s\n",
+ wake ? "/wakeup" : "");
/* Ignore these return values. We rely on pci code to
* reject requests the hardware can't implement, rather
* than coding the same thing.
*/
- (void) pci_enable_wake (dev, PCI_D3hot, hcd->remote_wakeup);
- (void) pci_enable_wake (dev, PCI_D3cold, hcd->remote_wakeup);
+ (void) pci_enable_wake (dev, PCI_D3hot, wake);
+ (void) pci_enable_wake (dev, PCI_D3cold, wake);
} else {
dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n",
retval);
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 6368562d73c..a98d978d76e 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -367,21 +367,39 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
/* DEVICE REQUESTS */
+ /* The root hub's remote wakeup enable bit is implemented using
+ * driver model wakeup flags. If this system supports wakeup
+ * through USB, userspace may change the default "allow wakeup"
+ * policy through sysfs or these calls.
+ *
+ * Most root hubs support wakeup from downstream devices, for
+ * runtime power management (disabling USB clocks and reducing
+ * VBUS power usage). However, not all of them do so; silicon,
+ * board, and BIOS bugs here are not uncommon, so these can't
+ * be treated quite like external hubs.
+ *
+ * Likewise, not all root hubs will pass wakeup events upstream,
+ * to wake up the whole system. So don't assume root hub and
+ * controller capabilities are identical.
+ */
+
case DeviceRequest | USB_REQ_GET_STATUS:
- tbuf [0] = (hcd->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP)
+ tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
+ << USB_DEVICE_REMOTE_WAKEUP)
| (1 << USB_DEVICE_SELF_POWERED);
tbuf [1] = 0;
len = 2;
break;
case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
if (wValue == USB_DEVICE_REMOTE_WAKEUP)
- hcd->remote_wakeup = 0;
+ device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
else
goto error;
break;
case DeviceOutRequest | USB_REQ_SET_FEATURE:
- if (hcd->can_wakeup && wValue == USB_DEVICE_REMOTE_WAKEUP)
- hcd->remote_wakeup = 1;
+ if (device_can_wakeup(&hcd->self.root_hub->dev)
+ && wValue == USB_DEVICE_REMOTE_WAKEUP)
+ device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
else
goto error;
break;
@@ -410,7 +428,7 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
bufp = fs_rh_config_descriptor;
len = sizeof fs_rh_config_descriptor;
}
- if (hcd->can_wakeup)
+ if (device_can_wakeup(&hcd->self.root_hub->dev))
patch_wakeup = 1;
break;
case USB_DT_STRING << 8:
@@ -1804,16 +1822,10 @@ int usb_add_hcd(struct usb_hcd *hcd,
device_init_wakeup(&rhdev->dev,
device_can_wakeup(hcd->self.controller));
- // ... all these hcd->*_wakeup flags will vanish
- hcd->can_wakeup = device_can_wakeup(hcd->self.controller);
-
- /* hcd->driver->reset() reported can_wakeup, probably with
- * assistance from board's boot firmware.
- * NOTE: normal devices won't enable wakeup by default.
- */
- if (hcd->can_wakeup)
+ /* NOTE: root hub and controller capabilities may not be the same */
+ if (device_can_wakeup(hcd->self.controller)
+ && device_can_wakeup(&hcd->self.root_hub->dev))
dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
- hcd->remote_wakeup = hcd->can_wakeup;
/* enable irqs just before we start the controller */
if (hcd->driver->irq) {
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index f44a2fe62a9..7022aafb2ae 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -78,8 +78,6 @@ struct usb_hcd { /* usb_bus.hcpriv points to this */
#define HCD_FLAG_HW_ACCESSIBLE 0x00000001
#define HCD_FLAG_SAW_IRQ 0x00000002
- unsigned can_wakeup:1; /* hw supports wakeup? */
- unsigned remote_wakeup:1;/* sw should use wakeup? */
unsigned rh_registered:1;/* is root hub registered? */
/* The next flag is a stopgap, to be removed when all the HCDs
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 867fa813023..f1d64d4bbf5 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1006,12 +1006,18 @@ void usb_set_device_state(struct usb_device *udev,
; /* do nothing */
else if (new_state != USB_STATE_NOTATTACHED) {
udev->state = new_state;
- if (new_state == USB_STATE_CONFIGURED)
- device_init_wakeup(&udev->dev,
- (udev->actconfig->desc.bmAttributes
- & USB_CONFIG_ATT_WAKEUP));
- else if (new_state != USB_STATE_SUSPENDED)
- device_init_wakeup(&udev->dev, 0);
+
+ /* root hub wakeup capabilities are managed out-of-band
+ * and may involve silicon errata ... ignore them here.
+ */
+ if (udev->parent) {
+ if (new_state == USB_STATE_CONFIGURED)
+ device_init_wakeup(&udev->dev,
+ (udev->actconfig->desc.bmAttributes
+ & USB_CONFIG_ATT_WAKEUP));
+ else if (new_state != USB_STATE_SUSPENDED)
+ device_init_wakeup(&udev->dev, 0);
+ }
} else
recursively_mark_NOTATTACHED(udev);
spin_unlock_irqrestore(&device_state_lock, flags);
@@ -1877,9 +1883,9 @@ int usb_resume_device(struct usb_device *udev)
if (udev->state == USB_STATE_NOTATTACHED)
return -ENODEV;
-#ifdef CONFIG_USB_SUSPEND
/* selective resume of one downstream hub-to-device port */
if (udev->parent) {
+#ifdef CONFIG_USB_SUSPEND
if (udev->state == USB_STATE_SUSPENDED) {
// NOTE swsusp may bork us, device state being wrong...
// NOTE this fails if parent is also suspended...
@@ -1887,8 +1893,8 @@ int usb_resume_device(struct usb_device *udev)
udev->portnum, udev);
} else
status = 0;
- } else
#endif
+ } else
status = finish_device_resume(udev);
if (status < 0)
dev_dbg(&udev->dev, "can't resume, status %d\n",
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-27 18:52:59 +0000