5.15-stable review patch. If anyone has any objections, please let me know.
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From: LeoLiuoc LeoLiu-oc@zhaoxin.com
commit e367e3c765f5477b2e79da0f1399aed49e2d1e37 upstream.
Add more Root Port Device IDs to pci_quirk_zhaoxin_pcie_ports_acs() for some new Zhaoxin platforms.
Fixes: 299bd044a6f3 ("PCI: Add ACS quirk for Zhaoxin Root/Downstream Ports") Link: https://lore.kernel.org/r/20231211091543.735903-1-LeoLiu-oc@zhaoxin.com Signed-off-by: LeoLiuoc LeoLiu-oc@zhaoxin.com [bhelgaas: update subject, drop changelog, add Fixes, add stable tag, fix whitespace, wrap code comment] Signed-off-by: Bjorn Helgaas bhelgaas@google.com Cc: stable@vger.kernel.org # 5.7 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/quirks.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4577,17 +4577,21 @@ static int pci_quirk_xgene_acs(struct pc * But the implementation could block peer-to-peer transactions between them * and provide ACS-like functionality. */ -static int pci_quirk_zhaoxin_pcie_ports_acs(struct pci_dev *dev, u16 acs_flags) +static int pci_quirk_zhaoxin_pcie_ports_acs(struct pci_dev *dev, u16 acs_flags) { if (!pci_is_pcie(dev) || ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) && (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM))) return -ENOTTY;
+ /* + * Future Zhaoxin Root Ports and Switch Downstream Ports will + * implement ACS capability in accordance with the PCIe Spec. + */ switch (dev->device) { case 0x0710 ... 0x071e: case 0x0721: - case 0x0723 ... 0x0732: + case 0x0723 ... 0x0752: return pci_acs_ctrl_enabled(acs_flags, PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); }