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pci-v4.13-fixes-2

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Merge tag 'pci-v4.13-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI fix from Bjorn Helgaas:
 "Work around Renesas uPD72020x 32-bit DMA issue"

* tag 'pci-v4.13-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  xhci: Reset Renesas uPD72020x USB controller for 32-bit DMA issue
  PCI: Add pci_reset_function_locked()
This commit is contained in:
Linus Torvalds 2017-08-10 14:52:45 -07:00
commit 4e082e9ba7
5 changed files with 64 additions and 0 deletions
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35
drivers/pci/pci.c
View File

@ -4259,6 +4259,41 @@ int pci_reset_function(struct pci_dev *dev)
}
EXPORT_SYMBOL_GPL(pci_reset_function);
/**
* pci_reset_function_locked - quiesce and reset a PCI device function
* @dev: PCI device to reset
*
* Some devices allow an individual function to be reset without affecting
* other functions in the same device. The PCI device must be responsive
* to PCI config space in order to use this function.
*
* This function does not just reset the PCI portion of a device, but
* clears all the state associated with the device. This function differs
* from __pci_reset_function() in that it saves and restores device state
* over the reset. It also differs from pci_reset_function() in that it
* requires the PCI device lock to be held.
*
* Returns 0 if the device function was successfully reset or negative if the
* device doesn't support resetting a single function.
*/
int pci_reset_function_locked(struct pci_dev *dev)
{
int rc;
rc = pci_probe_reset_function(dev);
if (rc)
return rc;
pci_dev_save_and_disable(dev);
rc = __pci_reset_function_locked(dev);
pci_dev_restore(dev);
return rc;
}
EXPORT_SYMBOL_GPL(pci_reset_function_locked);
/**
* pci_try_reset_function - quiesce and reset a PCI device function
* @dev: PCI device to reset

20
drivers/usb/host/pci-quirks.c
View File

@ -1150,3 +1150,23 @@ static void quirk_usb_early_handoff(struct pci_dev *pdev)
}
DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
PCI_CLASS_SERIAL_USB, 8, quirk_usb_early_handoff);
bool usb_xhci_needs_pci_reset(struct pci_dev *pdev)
{
/*
* Our dear uPD72020{1,2} friend only partially resets when
* asked to via the XHCI interface, and may end up doing DMA
* at the wrong addresses, as it keeps the top 32bit of some
* addresses from its previous programming under obscure
* circumstances.
* Give it a good wack at probe time. Unfortunately, this
* needs to happen before we've had a chance to discover any
* quirk, or the system will be in a rather bad state.
*/
if (pdev->vendor == PCI_VENDOR_ID_RENESAS &&
(pdev->device == 0x0014 || pdev->device == 0x0015))
return true;
return false;
}
EXPORT_SYMBOL_GPL(usb_xhci_needs_pci_reset);

1
drivers/usb/host/pci-quirks.h
View File

@ -15,6 +15,7 @@ void usb_asmedia_modifyflowcontrol(struct pci_dev *pdev);
void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev);
void usb_disable_xhci_ports(struct pci_dev *xhci_pdev);
void sb800_prefetch(struct device *dev, int on);
bool usb_xhci_needs_pci_reset(struct pci_dev *pdev);
#else
struct pci_dev;
static inline void usb_amd_quirk_pll_disable(void) {}

7
drivers/usb/host/xhci-pci.c
View File

@ -284,6 +284,13 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
driver = (struct hc_driver *)id->driver_data;
/* For some HW implementation, a XHCI reset is just not enough... */
if (usb_xhci_needs_pci_reset(dev)) {
dev_info(&dev->dev, "Resetting\n");
if (pci_reset_function_locked(dev))
dev_warn(&dev->dev, "Reset failed");
}
/* Prevent runtime suspending between USB-2 and USB-3 initialization */
pm_runtime_get_noresume(&dev->dev);

1
include/linux/pci.h
View File

@ -1067,6 +1067,7 @@ void pcie_flr(struct pci_dev *dev);
int __pci_reset_function(struct pci_dev *dev);
int __pci_reset_function_locked(struct pci_dev *dev);
int pci_reset_function(struct pci_dev *dev);
int pci_reset_function_locked(struct pci_dev *dev);
int pci_try_reset_function(struct pci_dev *dev);
int pci_probe_reset_slot(struct pci_slot *slot);
int pci_reset_slot(struct pci_slot *slot);