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USB: OHCI: host-controller resumes leave root hub suspended 

Drivers in the ohci-hcd family should perform certain tasks whenever
their controller device is resumed.  These include checking for loss
of power during suspend, turning on port power, and enabling interrupt
requests.

Until now these jobs have been carried out when the root hub is
resumed, not when the controller is.  Many drivers work around the
resulting awkwardness by automatically resuming their root hub
whenever the controller is resumed.  But this is wasteful and
unnecessary.

To simplify the situation, this patch (as1066) adds a new core
routine, ohci_finish_controller_resume(), which can be used by all the
OHCI-variant drivers.  They can call the new routine instead of
resuming their root hubs.  And ohci-pci.c can call it instead of using
its own special-purpose handler.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2008-04-03 18:03:17 -04:00 committed by Greg Kroah-Hartman
parent 7be7d74187
commit 43bbb7e015
8 changed files with 54 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/usb/host/ohci-at91.c
View File

@ -348,6 +348,7 @@ static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
if (!clocked)
at91_start_clock();
ohci_finish_controller_resume(hcd);
return 0;
}
#else

2
drivers/usb/host/ohci-ep93xx.c
View File

@ -192,8 +192,8 @@ static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
ohci->next_statechange = jiffies;
ep93xx_start_hc(&pdev->dev);
usb_hcd_resume_root_hub(hcd);
ohci_finish_controller_resume(hcd);
return 0;
}
#endif

43
drivers/usb/host/ohci-hub.c
View File

@ -326,6 +326,49 @@ static int ohci_bus_resume (struct usb_hcd *hcd)
return rc;
}
/* Carry out the final steps of resuming the controller device */
static void ohci_finish_controller_resume(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int port;
bool need_reinit = false;
/* See if the controller is already running or has been reset */
ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
need_reinit = true;
} else {
switch (ohci->hc_control & OHCI_CTRL_HCFS) {
case OHCI_USB_OPER:
case OHCI_USB_RESET:
need_reinit = true;
}
}
/* If needed, reinitialize and suspend the root hub */
if (need_reinit) {
spin_lock_irq(&ohci->lock);
hcd->state = HC_STATE_RESUMING;
ohci_rh_resume(ohci);
hcd->state = HC_STATE_QUIESCING;
ohci_rh_suspend(ohci, 0);
hcd->state = HC_STATE_SUSPENDED;
spin_unlock_irq(&ohci->lock);
}
/* Normally just turn on port power and enable interrupts */
else {
ohci_dbg(ohci, "powerup ports\n");
for (port = 0; port < ohci->num_ports; port++)
ohci_writel(ohci, RH_PS_PPS,
&ohci->regs->roothub.portstatus[port]);
ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
ohci_readl(ohci, &ohci->regs->intrenable);
msleep(20);
}
}
/* Carry out polling-, autostop-, and autoresume-related state changes */
static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
int any_connected)

5
drivers/usb/host/ohci-omap.c
View File

@ -510,14 +510,15 @@ static int ohci_omap_suspend(struct platform_device *dev, pm_message_t message)
static int ohci_omap_resume(struct platform_device *dev)
{
struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(dev));
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
omap_ohci_clock_power(1);
usb_hcd_resume_root_hub(platform_get_drvdata(dev));
ohci_finish_controller_resume(hcd);
return 0;
}

43
drivers/usb/host/ohci-pci.c
View File

@ -238,42 +238,6 @@ static int __devinit ohci_pci_start (struct usb_hcd *hcd)
return ret;
}
#if defined(CONFIG_USB_PERSIST) && (defined(CONFIG_USB_EHCI_HCD) || \
defined(CONFIG_USB_EHCI_HCD_MODULE))
/* Following a power loss, we must prepare to regain control of the ports
* we used to own. This means turning on the port power before ehci-hcd
* tries to switch ownership.
*
* This isn't a 100% perfect solution. On most systems the OHCI controllers
* lie at lower PCI addresses than the EHCI controller, so they will be
* discovered (and hence resumed) first. But there is no guarantee things
* will always work this way. If the EHCI controller is resumed first and
* the OHCI ports are unpowered, then the handover will fail.
*/
static void prepare_for_handover(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int port;
/* Here we "know" root ports should always stay powered */
ohci_dbg(ohci, "powerup ports\n");
for (port = 0; port < ohci->num_ports; port++)
ohci_writel(ohci, RH_PS_PPS,
&ohci->regs->roothub.portstatus[port]);
/* Flush those writes */
ohci_readl(ohci, &ohci->regs->control);
msleep(20);
}
#else
static inline void prepare_for_handover(struct usb_hcd *hcd)
{ }
#endif /* CONFIG_USB_PERSIST etc. */
#ifdef CONFIG_PM
static int ohci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
@ -312,13 +276,8 @@ static int ohci_pci_suspend (struct usb_hcd *hcd, pm_message_t message)
static int ohci_pci_resume (struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
/* FIXME: we should try to detect loss of VBUS power here */
prepare_for_handover(hcd);
ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
ohci_finish_controller_resume(hcd);
return 0;
}

3
drivers/usb/host/ohci-pxa27x.c
View File

@ -356,8 +356,7 @@ static int ohci_hcd_pxa27x_drv_resume(struct platform_device *pdev)
if ((status = pxa27x_start_hc(&pdev->dev)) < 0)
return status;
usb_hcd_resume_root_hub(hcd);
ohci_finish_controller_resume(hcd);
return 0;
}
#endif

5
drivers/usb/host/ohci-sm501.c
View File

@ -231,14 +231,15 @@ static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg)
static int ohci_sm501_resume(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(pdev));
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
usb_hcd_resume_root_hub(platform_get_drvdata(pdev));
ohci_finish_controller_resume(hcd);
return 0;
}
#else

1
drivers/usb/host/ohci-ssb.c
View File

@ -189,6 +189,7 @@ static int ssb_ohci_resume(struct ssb_device *dev)
ssb_device_enable(dev, ohcidev->enable_flags);
ohci_finish_controller_resume(hcd);
return 0;
}