From: "Rafael J. Wysocki" Subject: [PATCH 5/10] PCI / PCIe: Disable PCIe port services during port initialization Date: Fri, 6 Aug 2010 03:09:11 +0200 Message-ID: <201008060309.11255.rjw@sisk.pl> References: <201008060303.51224.rjw@sisk.pl> Mime-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <201008060303.51224.rjw@sisk.pl> Sender: linux-pci-owner@vger.kernel.org To: Hidetoshi Seto Cc: Kenji Kaneshige , Jesse Barnes , linux-pci@vger.kernel.org, ACPI Devel Maling List , linux-pm@lists.linux-foundation.org List-Id: linux-acpi@vger.kernel.org From: Rafael J. Wysocki In principle PCIe port services may be enabled by the BIOS, so it's better to disable them during port initialization to avoid spurious events from being generated. Signed-off-by: Rafael J. Wysocki Reviewed-by: Hidetoshi Seto --- drivers/pci/pcie/portdrv_core.c | 29 ++++++++++++++++++++++++++--- 1 file changed, 26 insertions(+), 3 deletions(-) Index: linux-2.6/drivers/pci/pcie/portdrv_core.c =================================================================== --- linux-2.6.orig/drivers/pci/pcie/portdrv_core.c +++ linux-2.6/drivers/pci/pcie/portdrv_core.c @@ -256,20 +256,43 @@ static int get_port_device_capability(st /* Hot-Plug Capable */ if ((cap_mask & PCIE_PORT_SERVICE_HP) && (reg16 & PCI_EXP_FLAGS_SLOT)) { pci_read_config_dword(dev, pos + PCI_EXP_SLTCAP, ®32); - if (reg32 & PCI_EXP_SLTCAP_HPC) + if (reg32 & PCI_EXP_SLTCAP_HPC) { services |= PCIE_PORT_SERVICE_HP; + /* + * Disable hot-plug interrupts in case they have been + * enabled by the BIOS and the hot-plug service driver + * is not loaded. + */ + pos += PCI_EXP_SLTCTL; + pci_read_config_word(dev, pos, ®16); + reg16 &= ~(PCI_EXP_SLTCTL_CCIE | PCI_EXP_SLTCTL_HPIE); + pci_write_config_word(dev, pos, reg16); + } } /* AER capable */ if ((cap_mask & PCIE_PORT_SERVICE_AER) - && pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR)) + && pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR)) { services |= PCIE_PORT_SERVICE_AER; + /* + * Disable AER on this port in case it's been enabled by the + * BIOS (the AER service driver will enable it when necessary). + */ + pci_disable_pcie_error_reporting(dev); + } /* VC support */ if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC)) services |= PCIE_PORT_SERVICE_VC; /* Root ports are capable of generating PME too */ if ((cap_mask & PCIE_PORT_SERVICE_PME) - && dev->pcie_type == PCI_EXP_TYPE_ROOT_PORT) + && dev->pcie_type == PCI_EXP_TYPE_ROOT_PORT) { services |= PCIE_PORT_SERVICE_PME; + /* + * Disable PME interrupt on this port in case it's been enabled + * by the BIOS (the PME service driver will enable it when + * necessary). + */ + pcie_pme_interrupt_enable(dev, false); + } return services; }