diff options
Diffstat (limited to 'drivers/pci/quirks.c')
| -rw-r--r-- | drivers/pci/quirks.c | 43 |
1 files changed, 37 insertions, 6 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index a4d33619a7bb..10684b17d0bd 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * This file contains work-arounds for many known PCI hardware * bugs. Devices present only on certain architectures (host @@ -3365,6 +3366,13 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0032, quirk_no_bus_reset); DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x003c, quirk_no_bus_reset); DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0033, quirk_no_bus_reset); +/* + * Root port on some Cavium CN8xxx chips do not successfully complete a bus + * reset when used with certain child devices. After the reset, config + * accesses to the child may fail. + */ +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CAVIUM, 0xa100, quirk_no_bus_reset); + static void quirk_no_pm_reset(struct pci_dev *dev) { /* @@ -4211,17 +4219,32 @@ static int pci_quirk_amd_sb_acs(struct pci_dev *dev, u16 acs_flags) #endif } +static bool pci_quirk_cavium_acs_match(struct pci_dev *dev) +{ + /* + * Effectively selects all downstream ports for whole ThunderX 1 + * family by 0xf800 mask (which represents 8 SoCs), while the lower + * bits of device ID are used to indicate which subdevice is used + * within the SoC. + */ + return (pci_is_pcie(dev) && + (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) && + ((dev->device & 0xf800) == 0xa000)); +} + static int pci_quirk_cavium_acs(struct pci_dev *dev, u16 acs_flags) { /* - * Cavium devices matching this quirk do not perform peer-to-peer - * with other functions, allowing masking out these bits as if they - * were unimplemented in the ACS capability. + * Cavium root ports don't advertise an ACS capability. However, + * the RTL internally implements similar protection as if ACS had + * Request Redirection, Completion Redirection, Source Validation, + * and Upstream Forwarding features enabled. Assert that the + * hardware implements and enables equivalent ACS functionality for + * these flags. */ - acs_flags &= ~(PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR | - PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT); + acs_flags &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_SV | PCI_ACS_UF); - if (!((dev->device >= 0xa000) && (dev->device <= 0xa0ff))) + if (!pci_quirk_cavium_acs_match(dev)) return -ENOTTY; return acs_flags ? 0 : 1; @@ -4799,3 +4822,11 @@ static void quirk_no_ats(struct pci_dev *pdev) /* AMD Stoney platform GPU */ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_no_ats); #endif /* CONFIG_PCI_ATS */ + +/* Freescale PCIe doesn't support MSI in RC mode */ +static void quirk_fsl_no_msi(struct pci_dev *pdev) +{ + if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT) + pdev->no_msi = 1; +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, quirk_fsl_no_msi); |