Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756234Ab3EHC5p (ORCPT ); Tue, 7 May 2013 22:57:45 -0400 Received: from mx1.redhat.com ([209.132.183.28]:21651 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752539Ab3EHC5n (ORCPT ); Tue, 7 May 2013 22:57:43 -0400 Subject: [PATCH v2 1/8] pci: Create pci_reset_bridge_secondary_bus() To: bhelgaas@google.com, linux-pci@vger.kernel.org From: Alex Williamson Cc: linux-kernel@vger.kernel.org Date: Tue, 07 May 2013 20:57:40 -0600 Message-ID: <20130508025740.30771.50033.stgit@bling.home> In-Reply-To: <20130508025339.30771.61937.stgit@bling.home> References: <20130508025339.30771.61937.stgit@bling.home> User-Agent: StGit/0.16 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2862 Lines: 79 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 --- drivers/pci/pci.c | 32 +++++++++++++++++++++++--------- include/linux/pci.h | 1 + 2 files changed, 24 insertions(+), 9 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b099e00..d0f313f 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3210,9 +3210,30 @@ 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) @@ -3225,14 +3246,7 @@ 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 710067f..695620c 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -905,6 +905,7 @@ 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/