- Add l1ss_cap and l1ss_cap_ptr to struct pci_dev
- In pci_configure_ltr(), compute the value of pci_dev.l1ss_cap
and pci_dev.l1ss_cap_ptr
- Replace all references to aspm_register_info.(l1ss_cap && l1ss_cap_ptr)
with pci_dev.(l1ss_cap && l1ss_cap_ptr)
- Remove the now redundant parameters of aspm_calc_l1ss_info()
- Change callers of aspm_calc_l1ss_info() to use the new signature
- In pcie_get_aspm_reg() remove reference to aspm_register_info.l1ss_cap*
- In pcie_get_aspm_reg() remove reading of l1ss_cap_ptr and l1ss_cap
- Remove aspm_register_info.(l1ss_cap && l1ss_cap_ptr)
Signed-off-by: Saheed O. Bolarinwa <refactormyself@xxxxxxxxx>
---
drivers/pci/pcie/aspm.c | 62 +++++++++++++----------------------------
drivers/pci/probe.c | 6 ++++
include/linux/pci.h | 2 ++
3 files changed, 28 insertions(+), 42 deletions(-)
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 321b328347c1..e7bb7d069361 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -386,8 +386,6 @@ struct aspm_register_info {
u32 enabled:2;
/* L1 substates */
- u32 l1ss_cap_ptr;
- u32 l1ss_cap;
u32 l1ss_ctl1;
u32 l1ss_ctl2;
};
@@ -400,26 +398,6 @@ static void pcie_get_aspm_reg(struct pci_dev *pdev,
pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &ctl);
info->enabled = ctl & PCI_EXP_LNKCTL_ASPMC;
- /* Read L1 PM substate capabilities */
- info->l1ss_cap = info->l1ss_ctl1 = info->l1ss_ctl2 = 0;
- info->l1ss_cap_ptr = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_L1SS);
- if (!info->l1ss_cap_ptr)
- return;
- pci_read_config_dword(pdev, info->l1ss_cap_ptr + PCI_L1SS_CAP,
- &info->l1ss_cap);
- if (!(info->l1ss_cap & PCI_L1SS_CAP_L1_PM_SS)) {
- info->l1ss_cap = 0;
- return;
- }
-
- /*
- * If we don't have LTR for the entire path from the Root Complex
- * to this device, we can't use ASPM L1.2 because it relies on the
- * LTR_L1.2_THRESHOLD. See PCIe r4.0, secs 5.5.4, 6.18.
- */
- if (!pdev->ltr_path)
- info->l1ss_cap &= ~PCI_L1SS_CAP_ASPM_L1_2;
-
pci_read_config_dword(pdev, info->l1ss_cap_ptr + PCI_L1SS_CTL1,
&info->l1ss_ctl1);
pci_read_config_dword(pdev, info->l1ss_cap_ptr + PCI_L1SS_CTL2,
@@ -488,38 +466,38 @@ static struct pci_dev *pci_function_0(struct pci_bus *linkbus)
}
/* Calculate L1.2 PM substate timing parameters */
-static void aspm_calc_l1ss_info(struct pcie_link_state *link,
- struct aspm_register_info *upreg,
- struct aspm_register_info *dwreg)
+static void aspm_calc_l1ss_info(struct pcie_link_state *link)
{
u32 val1, val2, scale1, scale2;
u32 t_common_mode, t_power_on, l1_2_threshold, scale, value;
+ struct pci_dev *dw_pdev = link->downstream;
+ struct pci_dev *up_pdev = link->pdev;
- link->l1ss.up_cap_ptr = upreg->l1ss_cap_ptr;
- link->l1ss.dw_cap_ptr = dwreg->l1ss_cap_ptr;
+ link->l1ss.up_cap_ptr = up_pdev->l1ss_cap_ptr;
+ link->l1ss.dw_cap_ptr = dw_pdev->l1ss_cap_ptr;
link->l1ss.ctl1 = link->l1ss.ctl2 = 0;
if (!(link->aspm_support & ASPM_STATE_L1_2_MASK))
return;
/* Choose the greater of the two Port Common_Mode_Restore_Times */
- val1 = (upreg->l1ss_cap & PCI_L1SS_CAP_CM_RESTORE_TIME) >> 8;
- val2 = (dwreg->l1ss_cap & PCI_L1SS_CAP_CM_RESTORE_TIME) >> 8;
+ val1 = (up_pdev->l1ss_cap & PCI_L1SS_CAP_CM_RESTORE_TIME) >> 8;
+ val2 = (dw_pdev->l1ss_cap & PCI_L1SS_CAP_CM_RESTORE_TIME) >> 8;
t_common_mode = max(val1, val2);
/* Choose the greater of the two Port T_POWER_ON times */
- val1 = (upreg->l1ss_cap & PCI_L1SS_CAP_P_PWR_ON_VALUE) >> 19;
- scale1 = (upreg->l1ss_cap & PCI_L1SS_CAP_P_PWR_ON_SCALE) >> 16;
- val2 = (dwreg->l1ss_cap & PCI_L1SS_CAP_P_PWR_ON_VALUE) >> 19;
- scale2 = (dwreg->l1ss_cap & PCI_L1SS_CAP_P_PWR_ON_SCALE) >> 16;
+ val1 = (up_pdev->l1ss_cap & PCI_L1SS_CAP_P_PWR_ON_VALUE) >> 19;
+ scale1 = (up_pdev->l1ss_cap & PCI_L1SS_CAP_P_PWR_ON_SCALE) >> 16;
+ val2 = (dw_pdev->l1ss_cap & PCI_L1SS_CAP_P_PWR_ON_VALUE) >> 19;
+ scale2 = (dw_pdev->l1ss_cap & PCI_L1SS_CAP_P_PWR_ON_SCALE) >> 16;
- if (calc_l1ss_pwron(link->pdev, scale1, val1) >
- calc_l1ss_pwron(link->downstream, scale2, val2)) {
+ if (calc_l1ss_pwron(up_pdev, scale1, val1) >
+ calc_l1ss_pwron(dw_pdev, scale2, val2)) {
link->l1ss.ctl2 |= scale1 | (val1 << 3);
- t_power_on = calc_l1ss_pwron(link->pdev, scale1, val1);
+ t_power_on = calc_l1ss_pwron(up_pdev, scale1, val1);
} else {
link->l1ss.ctl2 |= scale2 | (val2 << 3);
- t_power_on = calc_l1ss_pwron(link->downstream, scale2, val2);
+ t_power_on = calc_l1ss_pwron(dw_pdev, scale2, val2);
}
/*
@@ -603,13 +581,13 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
link->latency_dw.l1 = calc_l1_latency(child);
/* Setup L1 substate */
- if (upreg.l1ss_cap & dwreg.l1ss_cap & PCI_L1SS_CAP_ASPM_L1_1)
+ if (parent->l1ss_cap & child->l1ss_cap & PCI_L1SS_CAP_ASPM_L1_1)
link->aspm_support |= ASPM_STATE_L1_1;
- if (upreg.l1ss_cap & dwreg.l1ss_cap & PCI_L1SS_CAP_ASPM_L1_2)
+ if (parent->l1ss_cap & child->l1ss_cap & PCI_L1SS_CAP_ASPM_L1_2)
link->aspm_support |= ASPM_STATE_L1_2;
- if (upreg.l1ss_cap & dwreg.l1ss_cap & PCI_L1SS_CAP_PCIPM_L1_1)
+ if (parent->l1ss_cap & child->l1ss_cap & PCI_L1SS_CAP_PCIPM_L1_1)
link->aspm_support |= ASPM_STATE_L1_1_PCIPM;
- if (upreg.l1ss_cap & dwreg.l1ss_cap & PCI_L1SS_CAP_PCIPM_L1_2)
+ if (parent->l1ss_cap & child->l1ss_cap & PCI_L1SS_CAP_PCIPM_L1_2)
link->aspm_support |= ASPM_STATE_L1_2_PCIPM;
if (upreg.l1ss_ctl1 & dwreg.l1ss_ctl1 & PCI_L1SS_CTL1_ASPM_L1_1)
@@ -622,7 +600,7 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
link->aspm_enabled |= ASPM_STATE_L1_2_PCIPM;
if (link->aspm_support & ASPM_STATE_L1SS)
- aspm_calc_l1ss_info(link, &upreg, &dwreg);
+ aspm_calc_l1ss_info(link);
/* Save default state */
link->aspm_default = link->aspm_enabled;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 2d5898f05f89..71a714065e14 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2107,6 +2107,12 @@ static void pci_configure_ltr(struct pci_dev *dev)
if (!pci_is_pcie(dev))
return;
+ /* Read L1 PM substate capabilities */
+ dev->l1ss_cap_ptr = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS);
+ if (dev->l1ss_cap_ptr)
+ pci_read_config_dword(dev, dev->l1ss_cap_ptr + PCI_L1SS_CAP,
+ &dev->l1ss_cap);
+
pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap);
if (!(cap & PCI_EXP_DEVCAP2_LTR))
return;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 5b305cfeb1dc..60b82e255738 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -381,6 +381,8 @@ struct pci_dev {
struct pcie_link_state *link_state; /* ASPM link state */
unsigned int ltr_path:1; /* Latency Tolerance Reporting
supported from root to here */
+ int l1ss_cap_ptr; /* L1SS cap ptr, 0 if not supported */
+ u32 l1ss_cap; /* L1 PM substate Capabilities */
#endif
unsigned int eetlp_prefix_path:1; /* End-to-End TLP Prefix */
--
2.18.4
