summaryrefslogtreecommitdiffstats
path: root/drivers/pci/pcie/aspm.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci/pcie/aspm.c')
-rw-r--r--drivers/pci/pcie/aspm.c71
1 files changed, 38 insertions, 33 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 419f1f3697c..fdb3b7da738 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -41,9 +41,10 @@ struct pcie_link_state {
struct list_head link;
/* ASPM state */
- unsigned int support_state;
- unsigned int enabled_state;
- unsigned int bios_aspm_state;
+ u32 aspm_support:2; /* Supported ASPM state */
+ u32 aspm_enabled:2; /* Enabled ASPM state */
+ u32 aspm_default:2; /* Default ASPM state by BIOS */
+
/* upstream component */
unsigned int l0s_upper_latency;
unsigned int l1_upper_latency;
@@ -88,9 +89,9 @@ static int policy_to_aspm_state(struct pci_dev *pdev)
return 0;
case POLICY_POWERSAVE:
/* Enable ASPM L0s/L1 */
- return PCIE_LINK_STATE_L0S|PCIE_LINK_STATE_L1;
+ return PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1;
case POLICY_DEFAULT:
- return link_state->bios_aspm_state;
+ return link_state->aspm_default;
}
return 0;
}
@@ -311,6 +312,7 @@ static void pcie_aspm_get_cap_device(struct pci_dev *pdev, u32 *state,
u32 reg32;
unsigned int latency;
+ *l0s = *l1 = *enabled = 0;
pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
pci_read_config_dword(pdev, pos + PCI_EXP_LNKCAP, &reg32);
*state = (reg32 & PCI_EXP_LNKCAP_ASPMS) >> 10;
@@ -333,26 +335,29 @@ static void pcie_aspm_get_cap_device(struct pci_dev *pdev, u32 *state,
static void pcie_aspm_cap_init(struct pci_dev *pdev)
{
struct pci_dev *child_dev;
- u32 state, tmp;
+ u32 support, l0s, l1, enabled;
struct pcie_link_state *link_state = pdev->link_state;
/* upstream component states */
- pcie_aspm_get_cap_device(pdev, &link_state->support_state,
- &link_state->l0s_upper_latency,
- &link_state->l1_upper_latency,
- &link_state->enabled_state);
+ pcie_aspm_get_cap_device(pdev, &support, &l0s, &l1, &enabled);
+ link_state->aspm_support = support;
+ link_state->l0s_upper_latency = l0s;
+ link_state->l1_upper_latency = l1;
+ link_state->aspm_enabled = enabled;
+
/* downstream component states, all functions have the same setting */
child_dev = list_entry(pdev->subordinate->devices.next, struct pci_dev,
bus_list);
- pcie_aspm_get_cap_device(child_dev, &state,
- &link_state->l0s_down_latency,
- &link_state->l1_down_latency,
- &tmp);
- link_state->support_state &= state;
- if (!link_state->support_state)
+ pcie_aspm_get_cap_device(child_dev, &support, &l0s, &l1, &enabled);
+ link_state->aspm_support &= support;
+ link_state->l0s_down_latency = l0s;
+ link_state->l1_down_latency = l1;
+
+ if (!link_state->aspm_support)
return;
- link_state->enabled_state &= link_state->support_state;
- link_state->bios_aspm_state = link_state->enabled_state;
+
+ link_state->aspm_enabled &= link_state->aspm_support;
+ link_state->aspm_default = link_state->aspm_enabled;
/* ENDPOINT states*/
list_for_each_entry(child_dev, &pdev->subordinate->devices, bus_list) {
@@ -371,7 +376,7 @@ static void pcie_aspm_cap_init(struct pci_dev *pdev)
latency = (reg32 & PCI_EXP_DEVCAP_L0S) >> 6;
latency = calc_L0S_latency(latency, 1);
ep_state->l0s_acceptable_latency = latency;
- if (link_state->support_state & PCIE_LINK_STATE_L1) {
+ if (link_state->aspm_support & PCIE_LINK_STATE_L1) {
latency = (reg32 & PCI_EXP_DEVCAP_L1) >> 9;
latency = calc_L1_latency(latency, 1);
ep_state->l1_acceptable_latency = latency;
@@ -389,7 +394,7 @@ static unsigned int __pcie_aspm_check_state_one(struct pci_dev *pdev,
parent_dev = pdev->bus->self;
link_state = parent_dev->link_state;
- state &= link_state->support_state;
+ state &= link_state->aspm_support;
if (state == 0)
return 0;
ep_state = &link_state->endpoints[PCI_FUNC(pdev->devfn)];
@@ -519,7 +524,7 @@ static void __pcie_aspm_config_link(struct pci_dev *pdev, unsigned int state)
if (!(state & PCIE_LINK_STATE_L1))
__pcie_aspm_config_one_dev(pdev, state);
- link_state->enabled_state = state;
+ link_state->aspm_enabled = state;
}
static struct pcie_link_state *get_root_port_link(struct pcie_link_state *link)
@@ -550,7 +555,7 @@ static void __pcie_aspm_configure_link_state(struct pci_dev *pdev,
/* check root port link too in case it hasn't children */
state = pcie_aspm_check_state(root_port_link->pdev, state);
- if (link_state->enabled_state == state)
+ if (link_state->aspm_enabled == state)
return;
/*
@@ -675,10 +680,11 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
pcie_aspm_configure_common_clock(pdev);
pcie_aspm_cap_init(pdev);
} else {
- link_state->enabled_state = PCIE_LINK_STATE_L0S|PCIE_LINK_STATE_L1;
- link_state->bios_aspm_state = 0;
+ link_state->aspm_enabled =
+ (PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
+ link_state->aspm_default = 0;
/* Set support state to 0, so we will disable ASPM later */
- link_state->support_state = 0;
+ link_state->aspm_support = 0;
}
link_state->pdev = pdev;
@@ -690,7 +696,7 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
* initialization will config the whole hierarchy. but we must
* make sure BIOS doesn't set unsupported link state
**/
- state = pcie_aspm_check_state(pdev, link_state->bios_aspm_state);
+ state = pcie_aspm_check_state(pdev, link_state->aspm_default);
__pcie_aspm_config_link(pdev, state);
} else
__pcie_aspm_configure_link_state(pdev,
@@ -753,7 +759,7 @@ void pcie_aspm_pm_state_change(struct pci_dev *pdev)
* devices changed PM state, we should recheck if latency meets all
* functions' requirement
*/
- pcie_aspm_configure_link_state(pdev, link_state->enabled_state);
+ pcie_aspm_configure_link_state(pdev, link_state->aspm_enabled);
}
/*
@@ -776,12 +782,11 @@ void pci_disable_link_state(struct pci_dev *pdev, int state)
down_read(&pci_bus_sem);
mutex_lock(&aspm_lock);
link_state = parent->link_state;
- link_state->support_state &=
- ~(state & (PCIE_LINK_STATE_L0S|PCIE_LINK_STATE_L1));
+ link_state->aspm_support &= ~state;
if (state & PCIE_LINK_STATE_CLKPM)
link_state->clk_pm_capable = 0;
- __pcie_aspm_configure_link_state(parent, link_state->enabled_state);
+ __pcie_aspm_configure_link_state(parent, link_state->aspm_enabled);
if (!link_state->clk_pm_capable && link_state->clk_pm_enabled)
pcie_set_clock_pm(parent, 0);
mutex_unlock(&aspm_lock);
@@ -842,7 +847,7 @@ static ssize_t link_state_show(struct device *dev,
struct pci_dev *pci_device = to_pci_dev(dev);
struct pcie_link_state *link_state = pci_device->link_state;
- return sprintf(buf, "%d\n", link_state->enabled_state);
+ return sprintf(buf, "%d\n", link_state->aspm_enabled);
}
static ssize_t link_state_store(struct device *dev,
@@ -908,7 +913,7 @@ void pcie_aspm_create_sysfs_dev_files(struct pci_dev *pdev)
pdev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM) || !link_state)
return;
- if (link_state->support_state)
+ if (link_state->aspm_support)
sysfs_add_file_to_group(&pdev->dev.kobj,
&dev_attr_link_state.attr, power_group);
if (link_state->clk_pm_capable)
@@ -924,7 +929,7 @@ void pcie_aspm_remove_sysfs_dev_files(struct pci_dev *pdev)
pdev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM) || !link_state)
return;
- if (link_state->support_state)
+ if (link_state->aspm_support)
sysfs_remove_file_from_group(&pdev->dev.kobj,
&dev_attr_link_state.attr, power_group);
if (link_state->clk_pm_capable)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-23 12:01:27 +0000