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PCI fixes for Linux 6.13

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Merge tag 'pci-v6.13-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

Pull PCI fixes from Krzysztof Wilczyński:
 "Two small patches that are important for fixing boot time hang on
  Intel JHL7540 'Titan Ridge' platforms equipped with a Thunderbolt
  controller.

  The boot time issue manifests itself when a PCI Express bandwidth
  control is unnecessarily enabled on the Thunderbolt controller
  downstream ports, which only supports a link speed of 2.5 GT/s in
  accordance with USB4 v2 specification (p. 671, sec. 11.2.1, "PCIe
  Physical Layer Logical Sub-block").

  As such, there is no need to enable bandwidth control on such
  downstream port links, which also works around the issue.

  Both patches were tested by the original reporter on the hardware on
  which the failure origin golly manifested itself. Both fixes were
  proven to resolve the reported boot hang issue, and both patches have
  been in linux-next this week with no reported problems"

* tag 'pci-v6.13-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
  PCI/bwctrl: Enable only if more than one speed is supported
  PCI: Honor Max Link Speed when determining supported speeds
This commit is contained in:
Linus Torvalds 2024-12-21 10:51:04 -08:00
commit a99b4a369a
2 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/pci/pci.c
View File

@ -6232,12 +6232,14 @@ u8 pcie_get_supported_speeds(struct pci_dev *dev)
pcie_capability_read_dword(dev, PCI_EXP_LNKCAP2, &lnkcap2);
speeds = lnkcap2 & PCI_EXP_LNKCAP2_SLS;
/* Ignore speeds higher than Max Link Speed */
pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnkcap);
speeds &= GENMASK(lnkcap & PCI_EXP_LNKCAP_SLS, 0);
/* PCIe r3.0-compliant */
if (speeds)
return speeds;
pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &lnkcap);
/* Synthesize from the Max Link Speed field */
if ((lnkcap & PCI_EXP_LNKCAP_SLS) == PCI_EXP_LNKCAP_SLS_5_0GB)
speeds = PCI_EXP_LNKCAP2_SLS_5_0GB | PCI_EXP_LNKCAP2_SLS_2_5GB;

4
drivers/pci/pcie/portdrv.c
View File

@ -265,12 +265,14 @@ static int get_port_device_capability(struct pci_dev *dev)
(pcie_ports_dpc_native || (services & PCIE_PORT_SERVICE_AER)))
services |= PCIE_PORT_SERVICE_DPC;
/* Enable bandwidth control if more than one speed is supported. */
if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM ||
pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) {
u32 linkcap;
pcie_capability_read_dword(dev, PCI_EXP_LNKCAP, &linkcap);
if (linkcap & PCI_EXP_LNKCAP_LBNC)
if (linkcap & PCI_EXP_LNKCAP_LBNC &&
hweight8(dev->supported_speeds) > 1)
services |= PCIE_PORT_SERVICE_BWCTRL;
}