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path: root/drivers/pci
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Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci-acpi.c1
-rw-r--r--drivers/pci/pcie/aspm.c21
2 files changed, 18 insertions, 4 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)