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PCI: loongson: Fix supported link speeds for Loongson 3c19/3c29 PCIe devices proper dynamic speed negotiation. #2

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Merged
merged 1 commit into from
Jun 4, 2025
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PCI: loongson: Fix supported link speeds for Loongson 3c19/3c29 PCIe devices proper dynamic speed negotiation. #2

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24 changes: 24 additions & 0 deletions drivers/pci/quirks.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1988,6 +1988,30 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7525_MCH, quir

DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_HUAWEI, 0x1610, PCI_CLASS_BRIDGE_PCI, 8, quirk_pcie_mch);

/*
* Older steppings of the Loongson 3C6000 series incorrectly report the
* supported link speeds on their PCIe bridges (device IDs 3c19, 3c29) as
* only 2.5 GT/s, despite the upstream bus supporting speeds from 2.5 GT/s
* up to 16 GT/s.
*/
static void quirk_loongson_pci_bridge_supported_speeds(struct pci_dev *pdev)
{
switch (pdev->bus->max_bus_speed) {
case PCIE_SPEED_16_0GT:
pdev->supported_speeds |= PCI_EXP_LNKCAP2_SLS_16_0GB;
case PCIE_SPEED_8_0GT:
pdev->supported_speeds |= PCI_EXP_LNKCAP2_SLS_8_0GB;
case PCIE_SPEED_5_0GT:
pdev->supported_speeds |= PCI_EXP_LNKCAP2_SLS_5_0GB;
case PCIE_SPEED_2_5GT:
pdev->supported_speeds |= PCI_EXP_LNKCAP2_SLS_2_5GB;
default:
break;
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON, 0x3c19, quirk_loongson_secondary_bridge_supported_speeds);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON, 0x3c29, quirk_loongson_secondary_bridge_supported_speeds);

/*
* HiSilicon KunPeng920 and KunPeng930 have devices appear as PCI but are
* actually on the AMBA bus. These fake PCI devices can support SVA via
Expand Down