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authorJohn W. Linville <linville@tuxdriver.com>2005-07-27 10:19:44 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2005-09-08 14:57:24 -0700
commit064b53dbcc977dbf2753a67c2b8fc1c061d74f21 (patch)
tree39efa08fb7b0b7991bbfc4772f4fc3de0e8d11fa /drivers/pci/pci.c
parent1248d636122e4ec9d7802b850904e3bb48a0da23 (diff)
[PATCH] PCI: restore BAR values after D3hot->D0 for devices that need it
Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration (including BARs) when transitioning from D3hot->D0. This leaves such a device in an inaccessible state. The patch below causes the BARs to be restored when enabling such a device, so that its driver will be able to access it. The patch also adds pci_restore_bars as a new global symbol, and adds a correpsonding EXPORT_SYMBOL_GPL for that. Some firmware (e.g. Thinkpad T21) leaves devices in D3hot after a (re)boot. Most drivers call pci_enable_device very early, so devices left in D3hot that lose configuration during the D3hot->D0 transition will be inaccessible to their drivers. Drivers could be modified to account for this, but it would be difficult to know which drivers need modification. This is especially true since often many devices are covered by the same driver. It likely would be necessary to replicate code across dozens of drivers. The patch below should trigger only when transitioning from D3hot->D0 (or at boot), and only for devices that have the "no soft reset" bit cleared in the PM control register. I believe it is safe to include this patch as part of the PCI infrastructure. The cleanest implementation of pci_restore_bars was to call pci_update_resource. Unfortunately, that does not currently exist for the sparc64 architecture. The patch below includes a null implemenation of pci_update_resource for sparc64. Some have expressed interest in making general use of the the pci_restore_bars function, so that has been exported to GPL licensed modules. Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c59
1 files changed, 55 insertions, 4 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index c62d2f043397..93ec158d06c1 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -222,6 +222,37 @@ pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
}
/**
+ * pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
+ * @dev: PCI device to have its BARs restored
+ *
+ * Restore the BAR values for a given device, so as to make it
+ * accessible by its driver.
+ */
+void
+pci_restore_bars(struct pci_dev *dev)
+{
+ int i, numres;
+
+ switch (dev->hdr_type) {
+ case PCI_HEADER_TYPE_NORMAL:
+ numres = 6;
+ break;
+ case PCI_HEADER_TYPE_BRIDGE:
+ numres = 2;
+ break;
+ case PCI_HEADER_TYPE_CARDBUS:
+ numres = 1;
+ break;
+ default:
+ /* Should never get here, but just in case... */
+ return;
+ }
+
+ for (i = 0; i < numres; i ++)
+ pci_update_resource(dev, &dev->resource[i], i);
+}
+
+/**
* pci_set_power_state - Set the power state of a PCI device
* @dev: PCI device to be suspended
* @state: PCI power state (D0, D1, D2, D3hot, D3cold) we're entering
@@ -239,7 +270,7 @@ int (*platform_pci_set_power_state)(struct pci_dev *dev, pci_power_t t);
int
pci_set_power_state(struct pci_dev *dev, pci_power_t state)
{
- int pm;
+ int pm, need_restore = 0;
u16 pmcsr, pmc;
/* bound the state we're entering */
@@ -278,14 +309,17 @@ pci_set_power_state(struct pci_dev *dev, pci_power_t state)
return -EIO;
}
+ pci_read_config_word(dev, pm + PCI_PM_CTRL, &pmcsr);
+
/* If we're in D3, force entire word to 0.
* This doesn't affect PME_Status, disables PME_En, and
* sets PowerState to 0.
*/
- if (dev->current_state >= PCI_D3hot)
+ if (dev->current_state >= PCI_D3hot) {
+ if (!(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET))
+ need_restore = 1;
pmcsr = 0;
- else {
- pci_read_config_word(dev, pm + PCI_PM_CTRL, &pmcsr);
+ } else {
pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
pmcsr |= state;
}
@@ -308,6 +342,22 @@ pci_set_power_state(struct pci_dev *dev, pci_power_t state)
platform_pci_set_power_state(dev, state);
dev->current_state = state;
+
+ /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
+ * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
+ * from D3hot to D0 _may_ perform an internal reset, thereby
+ * going to "D0 Uninitialized" rather than "D0 Initialized".
+ * For example, at least some versions of the 3c905B and the
+ * 3c556B exhibit this behaviour.
+ *
+ * At least some laptop BIOSen (e.g. the Thinkpad T21) leave
+ * devices in a D3hot state at boot. Consequently, we need to
+ * restore at least the BARs so that the device will be
+ * accessible to its driver.
+ */
+ if (need_restore)
+ pci_restore_bars(dev);
+
return 0;
}
@@ -809,6 +859,7 @@ struct pci_dev *isa_bridge;
EXPORT_SYMBOL(isa_bridge);
#endif
+EXPORT_SYMBOL_GPL(pci_restore_bars);
EXPORT_SYMBOL(pci_enable_device_bars);
EXPORT_SYMBOL(pci_enable_device);
EXPORT_SYMBOL(pci_disable_device);