Introduce aspm_get_l1ss_cap() which is extracted from aspm_l1ss_init() to get the PCIe's L1SS capability. This does not change any behavior, but aspm_get_l1ss_cap() can be reused later. Link: https://bugzilla.kernel.org/show_bug.cgi?id=218394 Signed-off-by: Jian-Hong Pan <jhp@xxxxxxxxxxxxx> Reviewed-by: David E. Box <david.e.box@xxxxxxxxxxxxxxx> --- v6: - Skipped v7: - Pick back drivers/pci/pcie/aspm.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index bd0a8a05647e..5db1044c9895 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -611,6 +611,18 @@ static void pcie_aspm_check_latency(struct pci_dev *endpoint) } } +static u32 aspm_get_l1ss_cap(struct pci_dev *pdev) +{ + u32 l1ss_cap; + + pci_read_config_dword(pdev, pdev->l1ss + PCI_L1SS_CAP, &l1ss_cap); + + if (!(l1ss_cap & PCI_L1SS_CAP_L1_PM_SS)) + l1ss_cap = 0; + + return l1ss_cap; +} + /* Calculate L1.2 PM substate timing parameters */ static void aspm_calc_l12_info(struct pcie_link_state *link, u32 parent_l1ss_cap, u32 child_l1ss_cap) @@ -721,15 +733,8 @@ static void aspm_l1ss_init(struct pcie_link_state *link) return; /* Setup L1 substate */ - pci_read_config_dword(parent, parent->l1ss + PCI_L1SS_CAP, - &parent_l1ss_cap); - pci_read_config_dword(child, child->l1ss + PCI_L1SS_CAP, - &child_l1ss_cap); - - if (!(parent_l1ss_cap & PCI_L1SS_CAP_L1_PM_SS)) - parent_l1ss_cap = 0; - if (!(child_l1ss_cap & PCI_L1SS_CAP_L1_PM_SS)) - child_l1ss_cap = 0; + parent_l1ss_cap = aspm_get_l1ss_cap(parent); + child_l1ss_cap = aspm_get_l1ss_cap(child); /* * If we don't have LTR for the entire path from the Root Complex -- 2.45.2
