W dniu 11.06.2015 o 22:08, Duc Dang pisze:> X-Gene v1 PCIe controller has a bug in Configuration Request Retry > Status (CRS) logic: > When CPU tries to read Vendor ID and Device ID of not-existed > remote device, the controller returns 0xFFFF0001 instead of > 0xFFFFFFFF; this will add significant delay in boot time as > pci_bus_read_dev_vendor_id will wait for 60 seconds before > giving up. > > So for X-Gene v1 PCIe controllers, disable CRS capability > advertisement by clearing CRS Software Visibility bit before > returning the Root Capability value to the callers. This is done > by implementing X-Gene PCIe specific xgene_pcie_config_read32 for > CFG read accesses to replace the generic default pci_generic_config_read32 > function. > > Signed-off-by: Duc Dang <dhdang@xxxxxxx> > --- > drivers/pci/host/pci-xgene.c | 48 +++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 47 insertions(+), 1 deletion(-) Tested-by: Marcin Juszkiewicz <mjuszkiewicz@xxxxxxxxxx> Confirmed. It fixed issue. [ 0.842339] pci_hotplug: PCI Hot Plug PCI Core version: 0.5 [ 0.848235] pciehp: PCI Express Hot Plug Controller Driver version: 0.4 [ 0.855255] PCI host bridge /soc/pcie@1f2b0000 ranges: [ 0.860678] No bus range found for /soc/pcie@1f2b0000, using [bus 00-ff] [ 0.867950] IO 0xe010000000..0xe01000ffff -> 0x00000000 [ 0.873753] MEM 0xe180000000..0xe1ffffffff -> 0x80000000 [ 0.879592] xgene-pcie 1f2b0000.pcie: (rc) x1 gen-1 link up [ 0.885529] xgene-pcie 1f2b0000.pcie: PCI host bridge to bus 0000:00 [ 0.892248] pci_bus 0000:00: root bus resource [bus 00-ff] [ 0.898036] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] [ 0.904556] pci_bus 0000:00: root bus resource [mem 0xe180000000-0xe1ffffffff] (bus address [0x80000000-0xffffffff]) [ 0.915741] pci 0000:00:00.0: IOMMU is currently not supported for PCI [ 0.922936] pci 0000:01:00.0: IOMMU is currently not supported for PCI [ 0.929937] pci 0000:01:00.0: of_irq_parse_pci() failed with rc=-19 [ 0.936616] pci 0000:01:00.0: disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force' [ 0.947422] pci 0000:02:00.0: IOMMU is currently not supported for PCI [ 0.954439] vgaarb: device added: PCI:0000:02:00.0,decodes=io+mem,owns=none,locks=none [ 0.962946] pci 0000:00:00.0: BAR 14: assigned [mem 0xe180000000-0xe182ffffff] [ 0.970593] pci 0000:01:00.0: BAR 14: assigned [mem 0xe180000000-0xe182ffffff] [ 0.978239] pci 0000:02:00.0: BAR 0: assigned [mem 0xe180000000-0xe181ffffff pref] [ 0.986260] pci 0000:02:00.0: BAR 2: assigned [mem 0xe182000000-0xe1827fffff] [ 0.993828] pci 0000:02:00.0: BAR 6: assigned [mem 0xe182800000-0xe18281ffff pref] [ 1.001852] pci 0000:02:00.0: BAR 1: assigned [mem 0xe182820000-0xe182823fff] [ 1.009397] pci 0000:01:00.0: PCI bridge to [bus 02] [ 1.014637] pci 0000:01:00.0: bridge window [mem 0xe180000000-0xe182ffffff] [ 1.022200] pci 0000:00:00.0: PCI bridge to [bus 01-02] [ 1.027713] pci 0000:00:00.0: bridge window [mem 0xe180000000-0xe182ffffff] [ 1.035344] pcieport 0000:00:00.0: Signaling PME through PCIe PME interrupt [ 1.042709] pci 0000:01:00.0: Signaling PME through PCIe PME interrupt [ 1.049577] pci 0000:02:00.0: Signaling PME through PCIe PME interrupt [ 1.056538] pci 0000:01:00.0: TI XIO2000a quirk detected; secondary bus fast back-to-back transfers disabled compared to [ 2040.117742] pci 0000:00:00.0: BAR 14: assigned [mem 0xe180000000-0xe182ffffff] Similar with Radeon card. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
