linux/drivers/usb/core/hcd-pci.c
Rafael J. Wysocki 3494252d56 USB/PCI: Fix resume breakage of controllers behind cardbus bridges
If a USB PCI controller is behind a cardbus bridge, we are trying to
restore its configuration registers too early, before the cardbus
bridge is operational.  To fix this, call pci_restore_state() from
usb_hcd_pci_resume() and remove usb_hcd_pci_resume_early() which is
no longer necessary (the configuration spaces of USB controllers that
are not behind cardbus bridges will be restored by the PCI PM core
with interrupts disabled anyway).

This patch fixes the regression from 2.6.28 tracked as
http://bugzilla.kernel.org/show_bug.cgi?id=12659

[ Side note: the proper long-term fix is probably to just force the
  unplug event at suspend time instead of doing a plug/unplug at resume
  time, but this patch is fine regardless  - Linus ]

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reported-by: Miles Lane <miles.lane@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-02-17 16:56:31 -08:00

379 lines
9.4 KiB
C

/*
* (C) Copyright David Brownell 2000-2002
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/usb.h>
#include <asm/io.h>
#include <asm/irq.h>
#ifdef CONFIG_PPC_PMAC
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/pci-bridge.h>
#include <asm/prom.h>
#endif
#include "usb.h"
#include "hcd.h"
/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */
/*-------------------------------------------------------------------------*/
/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */
/**
* usb_hcd_pci_probe - initialize PCI-based HCDs
* @dev: USB Host Controller being probed
* @id: pci hotplug id connecting controller to HCD framework
* Context: !in_interrupt()
*
* Allocates basic PCI resources for this USB host controller, and
* then invokes the start() method for the HCD associated with it
* through the hotplug entry's driver_data.
*
* Store this function in the HCD's struct pci_driver as probe().
*/
int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
struct hc_driver *driver;
struct usb_hcd *hcd;
int retval;
if (usb_disabled())
return -ENODEV;
if (!id)
return -EINVAL;
driver = (struct hc_driver *)id->driver_data;
if (!driver)
return -EINVAL;
if (pci_enable_device(dev) < 0)
return -ENODEV;
dev->current_state = PCI_D0;
if (!dev->irq) {
dev_err(&dev->dev,
"Found HC with no IRQ. Check BIOS/PCI %s setup!\n",
pci_name(dev));
retval = -ENODEV;
goto err1;
}
hcd = usb_create_hcd(driver, &dev->dev, pci_name(dev));
if (!hcd) {
retval = -ENOMEM;
goto err1;
}
if (driver->flags & HCD_MEMORY) {
/* EHCI, OHCI */
hcd->rsrc_start = pci_resource_start(dev, 0);
hcd->rsrc_len = pci_resource_len(dev, 0);
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
driver->description)) {
dev_dbg(&dev->dev, "controller already in use\n");
retval = -EBUSY;
goto err2;
}
hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
if (hcd->regs == NULL) {
dev_dbg(&dev->dev, "error mapping memory\n");
retval = -EFAULT;
goto err3;
}
} else {
/* UHCI */
int region;
for (region = 0; region < PCI_ROM_RESOURCE; region++) {
if (!(pci_resource_flags(dev, region) &
IORESOURCE_IO))
continue;
hcd->rsrc_start = pci_resource_start(dev, region);
hcd->rsrc_len = pci_resource_len(dev, region);
if (request_region(hcd->rsrc_start, hcd->rsrc_len,
driver->description))
break;
}
if (region == PCI_ROM_RESOURCE) {
dev_dbg(&dev->dev, "no i/o regions available\n");
retval = -EBUSY;
goto err1;
}
}
pci_set_master(dev);
retval = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
if (retval != 0)
goto err4;
return retval;
err4:
if (driver->flags & HCD_MEMORY) {
iounmap(hcd->regs);
err3:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
} else
release_region(hcd->rsrc_start, hcd->rsrc_len);
err2:
usb_put_hcd(hcd);
err1:
pci_disable_device(dev);
dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);
/* may be called without controller electrically present */
/* may be called with controller, bus, and devices active */
/**
* usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
* @dev: USB Host Controller being removed
* Context: !in_interrupt()
*
* Reverses the effect of usb_hcd_pci_probe(), first invoking
* the HCD's stop() method. It is always called from a thread
* context, normally "rmmod", "apmd", or something similar.
*
* Store this function in the HCD's struct pci_driver as remove().
*/
void usb_hcd_pci_remove(struct pci_dev *dev)
{
struct usb_hcd *hcd;
hcd = pci_get_drvdata(dev);
if (!hcd)
return;
usb_remove_hcd(hcd);
if (hcd->driver->flags & HCD_MEMORY) {
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
} else {
release_region(hcd->rsrc_start, hcd->rsrc_len);
}
usb_put_hcd(hcd);
pci_disable_device(dev);
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);
#ifdef CONFIG_PM
/**
* usb_hcd_pci_suspend - power management suspend of a PCI-based HCD
* @dev: USB Host Controller being suspended
* @message: Power Management message describing this state transition
*
* Store this function in the HCD's struct pci_driver as .suspend.
*/
int usb_hcd_pci_suspend(struct pci_dev *dev, pm_message_t message)
{
struct usb_hcd *hcd = pci_get_drvdata(dev);
int retval = 0;
int wake, w;
int has_pci_pm;
/* Root hub suspend should have stopped all downstream traffic,
* and all bus master traffic. And done so for both the interface
* and the stub usb_device (which we check here). But maybe it
* didn't; writing sysfs power/state files ignores such rules...
*
* We must ignore the FREEZE vs SUSPEND distinction here, because
* otherwise the swsusp will save (and restore) garbage state.
*/
if (!(hcd->state == HC_STATE_SUSPENDED ||
hcd->state == HC_STATE_HALT)) {
dev_warn(&dev->dev, "Root hub is not suspended\n");
retval = -EBUSY;
goto done;
}
/* We might already be suspended (runtime PM -- not yet written) */
if (dev->current_state != PCI_D0)
goto done;
if (hcd->driver->pci_suspend) {
retval = hcd->driver->pci_suspend(hcd, message);
suspend_report_result(hcd->driver->pci_suspend, retval);
if (retval)
goto done;
}
synchronize_irq(dev->irq);
/* Downstream ports from this root hub should already be quiesced, so
* there will be no DMA activity. Now we can shut down the upstream
* link (except maybe for PME# resume signaling) and enter some PCI
* low power state, if the hardware allows.
*/
pci_disable_device(dev);
pci_save_state(dev);
/* Don't fail on error to enable wakeup. We rely on pci code
* to reject requests the hardware can't implement, rather
* than coding the same thing.
*/
wake = (hcd->state == HC_STATE_SUSPENDED &&
device_may_wakeup(&dev->dev));
w = pci_wake_from_d3(dev, wake);
if (w < 0)
wake = w;
dev_dbg(&dev->dev, "wakeup: %d\n", wake);
/* Don't change state if we don't need to */
if (message.event == PM_EVENT_FREEZE ||
message.event == PM_EVENT_PRETHAW) {
dev_dbg(&dev->dev, "--> no state change\n");
goto done;
}
has_pci_pm = pci_find_capability(dev, PCI_CAP_ID_PM);
if (!has_pci_pm) {
dev_dbg(&dev->dev, "--> PCI D0 legacy\n");
} else {
/* 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, PCI_D3hot);
suspend_report_result(pci_set_power_state, retval);
if (retval == 0) {
dev_dbg(&dev->dev, "--> PCI D3\n");
} else {
dev_dbg(&dev->dev, "PCI D3 suspend fail, %d\n",
retval);
pci_restore_state(dev);
}
}
#ifdef CONFIG_PPC_PMAC
if (retval == 0) {
/* Disable ASIC clocks for USB */
if (machine_is(powermac)) {
struct device_node *of_node;
of_node = pci_device_to_OF_node(dev);
if (of_node)
pmac_call_feature(PMAC_FTR_USB_ENABLE,
of_node, 0, 0);
}
}
#endif
done:
return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_suspend);
/**
* usb_hcd_pci_resume - power management resume of a PCI-based HCD
* @dev: USB Host Controller being resumed
*
* Store this function in the HCD's struct pci_driver as .resume.
*/
int usb_hcd_pci_resume(struct pci_dev *dev)
{
struct usb_hcd *hcd;
int retval;
#ifdef CONFIG_PPC_PMAC
/* Reenable ASIC clocks for USB */
if (machine_is(powermac)) {
struct device_node *of_node;
of_node = pci_device_to_OF_node(dev);
if (of_node)
pmac_call_feature(PMAC_FTR_USB_ENABLE,
of_node, 0, 1);
}
#endif
pci_restore_state(dev);
hcd = pci_get_drvdata(dev);
if (hcd->state != HC_STATE_SUSPENDED) {
dev_dbg(hcd->self.controller,
"can't resume, not suspended!\n");
return 0;
}
pci_enable_wake(dev, PCI_D0, false);
retval = pci_enable_device(dev);
if (retval < 0) {
dev_err(&dev->dev, "can't re-enable after resume, %d!\n",
retval);
return retval;
}
pci_set_master(dev);
/* yes, ignore this result too... */
(void) pci_wake_from_d3(dev, 0);
clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
if (hcd->driver->pci_resume) {
retval = hcd->driver->pci_resume(hcd);
if (retval) {
dev_err(hcd->self.controller,
"PCI post-resume error %d!\n", retval);
usb_hc_died(hcd);
}
}
return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_resume);
#endif /* CONFIG_PM */
/**
* usb_hcd_pci_shutdown - shutdown host controller
* @dev: USB Host Controller being shutdown
*/
void usb_hcd_pci_shutdown(struct pci_dev *dev)
{
struct usb_hcd *hcd;
hcd = pci_get_drvdata(dev);
if (!hcd)
return;
if (hcd->driver->shutdown)
hcd->driver->shutdown(hcd);
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);