#include "hcd.h"
-/* PCI-based HCs are normal, but custom bus glue should be ok */
+/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
/*-------------------------------------------------------------------------*/
if (pci_enable_device (dev) < 0)
return -ENODEV;
- dev->current_state = 0;
- dev->dev.power.power_state = 0;
+ dev->current_state = PCI_D0;
+ dev->dev.power.power_state = PMSG_ON;
if (!dev->irq) {
dev_err (&dev->dev,
#ifdef CONFIG_PM
-static char __attribute_used__ *pci_state(u32 state)
-{
- switch (state) {
- case 0: return "D0";
- case 1: return "D1";
- case 2: return "D2";
- case 3: return "D3hot";
- case 4: return "D3cold";
- }
- return NULL;
-}
-
/**
* usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
* @dev: USB Host Controller being suspended
- * @state: state that the controller is going into
+ * @message: semantics in flux
*
* Store this function in the HCD's struct pci_driver as suspend().
*/
-int usb_hcd_pci_suspend (struct pci_dev *dev, u32 state)
+int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message)
{
struct usb_hcd *hcd;
int retval = 0;
hcd = pci_get_drvdata(dev);
+ /* FIXME until the generic PM interfaces change a lot more, this
+ * can't use PCI D1 and D2 states. For example, the confusion
+ * between messages and states will need to vanish, and messages
+ * will need to provide a target system state again.
+ *
+ * It'll be important to learn characteristics of the target state,
+ * especially on embedded hardware where the HCD will often be in
+ * charge of an external VBUS power supply and one or more clocks.
+ * Some target system states will leave them active; others won't.
+ * (With PCI, that's often handled by platform BIOS code.)
+ */
+
/* even when the PCI layer rejects some of the PCI calls
* below, HCs can try global suspend and reduce DMA traffic.
* PM-sensitive HCDs may already have done this.
*/
has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
- if (state > 4)
- state = 4;
switch (hcd->state) {
*/
case HC_STATE_RUNNING:
hcd->state = HC_STATE_QUIESCING;
- retval = hcd->driver->suspend (hcd, state);
+ retval = hcd->driver->suspend (hcd, message);
if (retval) {
dev_dbg (hcd->self.controller,
"suspend fail, retval %d\n",
* have been called, otherwise root hub timers still run ...
*/
case HC_STATE_SUSPENDED:
- if (state <= dev->current_state)
- break;
-
- /* no DMA or IRQs except in D0 */
- if (!dev->current_state) {
+ /* no DMA or IRQs except when HC is active */
+ if (dev->current_state == PCI_D0) {
+ free_irq (hcd->irq, hcd);
pci_save_state (dev);
pci_disable_device (dev);
- free_irq (hcd->irq, hcd);
}
if (!has_pci_pm) {
break;
}
- /* POLICY: ignore D1/D2/D3hot differences;
- * we know D3hot will always work.
+ /* NOTE: dev->current_state becomes nonzero only here, and
+ * only for devices that support PCI PM. Also, exiting
+ * PCI_D3 (but not PCI_D1 or PCI_D2) is allowed to reset
+ * some device state (e.g. as part of clock reinit).
*/
- retval = pci_set_power_state (dev, state);
- if (retval < 0 && state < 3) {
- retval = pci_set_power_state (dev, 3);
- if (retval == 0)
- state = 3;
- }
+ retval = pci_set_power_state (dev, PCI_D3hot);
if (retval == 0) {
- dev_dbg (hcd->self.controller, "--> PCI %s\n",
- pci_state(dev->current_state));
-#ifdef CONFIG_USB_SUSPEND
- pci_enable_wake (dev, state, hcd->remote_wakeup);
- pci_enable_wake (dev, 4, hcd->remote_wakeup);
-#endif
+ dev_dbg (hcd->self.controller, "--> PCI D3\n");
+ pci_enable_wake (dev, PCI_D3hot, hcd->remote_wakeup);
+ pci_enable_wake (dev, PCI_D3cold, hcd->remote_wakeup);
} else if (retval < 0) {
- dev_dbg (&dev->dev, "PCI %s suspend fail, %d\n",
- pci_state(state), retval);
+ dev_dbg (&dev->dev, "PCI D3 suspend fail, %d\n",
+ retval);
(void) usb_hcd_pci_resume (dev);
break;
}
default:
dev_dbg (hcd->self.controller, "hcd state %d; not suspended\n",
hcd->state);
+ WARN_ON(1);
retval = -EINVAL;
break;
}
/* update power_state **ONLY** to make sysfs happier */
if (retval == 0)
- dev->dev.power.power_state = state;
+ dev->dev.power.power_state = message;
return retval;
}
EXPORT_SYMBOL (usb_hcd_pci_suspend);
{
struct usb_hcd *hcd;
int retval;
- int has_pci_pm;
hcd = pci_get_drvdata(dev);
if (hcd->state != HC_STATE_SUSPENDED) {
"can't resume, not suspended!\n");
return 0;
}
- has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
- /* D3cold resume isn't usually reported this way... */
- dev_dbg(hcd->self.controller, "resume from PCI %s%s\n",
- pci_state(dev->current_state),
- has_pci_pm ? "" : " (legacy)");
+ /* NOTE: chip docs cover clean "real suspend" cases (what Linux
+ * calls "standby", "suspend to RAM", and so on). There are also
+ * dirty cases when swsusp fakes a suspend in "shutdown" mode.
+ */
+ if (dev->current_state != PCI_D0) {
+#ifdef DEBUG
+ int pci_pm;
+ u16 pmcr;
+
+ pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
+ pci_read_config_word(dev, pci_pm + PCI_PM_CTRL, &pmcr);
+ pmcr &= PCI_PM_CTRL_STATE_MASK;
+ if (pmcr) {
+ /* Clean case: power to USB and to HC registers was
+ * maintained; remote wakeup is easy.
+ */
+ dev_dbg(hcd->self.controller, "resume from PCI D%d\n",
+ pmcr);
+ } else {
+ /* Clean: HC lost Vcc power, D0 uninitialized
+ * + Vaux may have preserved port and transceiver
+ * state ... for remote wakeup from D3cold
+ * + or not; HCD must reinit + re-enumerate
+ *
+ * Dirty: D0 semi-initialized cases with swsusp
+ * + after BIOS init
+ * + after Linux init (HCD statically linked)
+ */
+ dev_dbg(hcd->self.controller,
+ "PCI D0, from previous PCI D%d\n",
+ dev->current_state);
+ }
+#endif
+ pci_enable_wake (dev, dev->current_state, 0);
+ pci_enable_wake (dev, PCI_D3cold, 0);
+ } else {
+ /* Same basic cases: clean (powered/not), dirty */
+ dev_dbg(hcd->self.controller, "PCI legacy resume\n");
+ }
+
+ /* NOTE: the PCI API itself is asymmetric here. We don't need to
+ * pci_set_power_state(PCI_D0) since that's part of re-enabling;
+ * but that won't re-enable bus mastering. Yet pci_disable_device()
+ * explicitly disables bus mastering...
+ */
+ retval = pci_enable_device (dev);
+ if (retval < 0) {
+ dev_err (hcd->self.controller,
+ "can't re-enable after resume, %d!\n", retval);
+ return retval;
+ }
+ pci_set_master (dev);
+ pci_restore_state (dev);
+
+ dev->dev.power.power_state = PMSG_ON;
hcd->state = HC_STATE_RESUMING;
-
- if (has_pci_pm)
- pci_set_power_state (dev, 0);
- dev->dev.power.power_state = 0;
+ hcd->saw_irq = 0;
retval = request_irq (dev->irq, usb_hcd_irq, SA_SHIRQ,
- hcd->driver->description, hcd);
+ hcd->irq_descr, hcd);
if (retval < 0) {
dev_err (hcd->self.controller,
"can't restore IRQ after resume!\n");
+ usb_hc_died (hcd);
return retval;
}
- hcd->saw_irq = 0;
- pci_restore_state (dev);
-#ifdef CONFIG_USB_SUSPEND
- pci_enable_wake (dev, dev->current_state, 0);
- pci_enable_wake (dev, 4, 0);
-#endif
retval = hcd->driver->resume (hcd);
if (!HC_IS_RUNNING (hcd->state)) {
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