diff mbox

[RFC,1/7] pci: Create pci_reset_bridge_secondary_bus()

Message ID 20130731033135.31931.10896.stgit@bling.home (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Alex Williamson July 31, 2013, 3:31 a.m. UTC 
Move the secondary bus reset code from pci_parent_bus_reset() into its own
function.  Export it as we'll later be calling it from hotplug controllers.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 drivers/pci/pci.c   |   32 +++++++++++++++++++++++---------
 include/linux/pci.h |    1 +
 2 files changed, 24 insertions(+), 9 deletions(-)


--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index a599a6b..bfd629c 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3276,9 +3276,30 @@  static int pci_pm_reset(struct pci_dev *dev, int probe)
 	return 0;
 }
 
-static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
+/**
+ * pci_reset_bridge_secondary_bus - Reset the secondary bus on a PCI bridge.
+ * @dev: Bridge device
+ *
+ * Use the bridge control register to assert reset on the secondary bus.
+ * Devices on the secondary bus are left in power-on state.
+ */
+void pci_reset_bridge_secondary_bus(struct pci_dev *dev)
 {
 	u16 ctrl;
+
+	pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &ctrl);
+	ctrl |= PCI_BRIDGE_CTL_BUS_RESET;
+	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl);
+	msleep(100);
+
+	ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET;
+	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl);
+	msleep(100);
+}
+EXPORT_SYMBOL_GPL(pci_reset_bridge_secondary_bus);
+
+static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
+{
 	struct pci_dev *pdev;
 
 	if (pci_is_root_bus(dev->bus) || dev->subordinate || !dev->bus->self)
@@ -3291,14 +3312,7 @@  static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
 	if (probe)
 		return 0;
 
-	pci_read_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, &ctrl);
-	ctrl |= PCI_BRIDGE_CTL_BUS_RESET;
-	pci_write_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, ctrl);
-	msleep(100);
-
-	ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET;
-	pci_write_config_word(dev->bus->self, PCI_BRIDGE_CONTROL, ctrl);
-	msleep(100);
+	pci_reset_bridge_secondary_bus(dev->bus->self);
 
 	return 0;
 }
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0fd1f15..35c1bc4 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -924,6 +924,7 @@  int pcie_set_mps(struct pci_dev *dev, int mps);
 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);
+void pci_reset_bridge_secondary_bus(struct pci_dev *dev);
 void pci_update_resource(struct pci_dev *dev, int resno);
 int __must_check pci_assign_resource(struct pci_dev *dev, int i);
 int __must_check pci_reassign_resource(struct pci_dev *dev, int i, resource_size_t add_size, resource_size_t align);