diff options
| -rw-r--r-- | drivers/pci/pci-acpi.c | 1 | ||||
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 21 | ||||
| -rw-r--r-- | include/linux/pci-aspm.h | 5 |
3 files changed, 22 insertions, 5 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index 24e19c594e57..d7ea699b8ddc 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -399,6 +399,7 @@ static int __init acpi_pci_init(void) if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); + pcie_clear_aspm(); pcie_no_aspm(); } diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 71222814c1ec..3188cd96b338 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -68,7 +68,7 @@ struct pcie_link_state { struct aspm_latency acceptable[8]; }; -static int aspm_disabled, aspm_force; +static int aspm_disabled, aspm_force, aspm_clear_state; static DEFINE_MUTEX(aspm_lock); static LIST_HEAD(link_list); @@ -139,7 +139,7 @@ static void pcie_set_clkpm(struct pcie_link_state *link, int enable) { /* Don't enable Clock PM if the link is not Clock PM capable */ if (!link->clkpm_capable && enable) - return; + enable = 0; /* Need nothing if the specified equals to current state */ if (link->clkpm_enabled == enable) return; @@ -498,6 +498,10 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev) struct pci_dev *child; int pos; u32 reg32; + + if (aspm_clear_state) + return -EINVAL; + /* * Some functions in a slot might not all be PCIe functions, * very strange. Disable ASPM for the whole slot @@ -563,12 +567,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev) struct pcie_link_state *link; int blacklist = !!pcie_aspm_sanity_check(pdev); - if (aspm_disabled || !pci_is_pcie(pdev) || pdev->link_state) + if (!pci_is_pcie(pdev) || pdev->link_state) return; if (pdev->pcie_type != PCI_EXP_TYPE_ROOT_PORT && pdev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM) return; + if (aspm_disabled && !aspm_clear_state) + return; + /* VIA has a strange chipset, root port is under a bridge */ if (pdev->pcie_type == PCI_EXP_TYPE_ROOT_PORT && pdev->bus->self) @@ -641,7 +648,7 @@ void pcie_aspm_exit_link_state(struct pci_dev *pdev) struct pci_dev *parent = pdev->bus->self; struct pcie_link_state *link, *root, *parent_link; - if (aspm_disabled || !pci_is_pcie(pdev) || + if ((aspm_disabled && !aspm_clear_state) || !pci_is_pcie(pdev) || !parent || !parent->link_state) return; if ((parent->pcie_type != PCI_EXP_TYPE_ROOT_PORT) && @@ -899,6 +906,12 @@ static int __init pcie_aspm_disable(char *str) __setup("pcie_aspm=", pcie_aspm_disable); +void pcie_clear_aspm(void) +{ + if (!aspm_force) + aspm_clear_state = 1; +} + void pcie_no_aspm(void) { if (!aspm_force) diff --git a/include/linux/pci-aspm.h b/include/linux/pci-aspm.h index 91ba0b338b47..ce6810512c66 100644 --- a/include/linux/pci-aspm.h +++ b/include/linux/pci-aspm.h @@ -27,6 +27,7 @@ extern void pcie_aspm_init_link_state(struct pci_dev *pdev); extern void pcie_aspm_exit_link_state(struct pci_dev *pdev); extern void pcie_aspm_pm_state_change(struct pci_dev *pdev); extern void pci_disable_link_state(struct pci_dev *pdev, int state); +extern void pcie_clear_aspm(void); extern void pcie_no_aspm(void); #else static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) @@ -41,7 +42,9 @@ static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) static inline void pci_disable_link_state(struct pci_dev *pdev, int state) { } - +static inline void pcie_clear_aspm(void) +{ +} static inline void pcie_no_aspm(void) { } |