diff options
| author | Saheed O. Bolarinwa <refactormyself@gmail.com> | 2020-10-15 22:30:32 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2020-10-16 19:20:59 +0300 |
| commit | 67bcc9ad6810c43195959f2fd7a202959860e5c8 (patch) | |
| tree | 67afcc264a007e1fdfb47d8463936b22603efd2d /drivers/pci | |
| parent | c6e5f02b5281a3166a9b7b4d66830cc234421ba5 (diff) | |
| download | linux-67bcc9ad6810c43195959f2fd7a202959860e5c8.tar.xz | |
PCI/ASPM: Remove struct aspm_register_info.enabled
Previously we stored the "ASPM Control" bits from the Link Control register
in the struct aspm_register_info.
Read PCI_EXP_LNKCTL directly when needed. This means we can use the
PCI_EXP_LNKCTL_ASPM_* bits directly instead of the similar but different
PCIE_LINK_STATE_* bits. No functional change intended.
[bhelgaas: drop get_aspm_enable() and read LNKCTL once directly]
Link: https://lore.kernel.org/r/20201015193039.12585-6-helgaas@kernel.org
Signed-off-by: Saheed O. Bolarinwa <refactormyself@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 82ce34e2ef53..36540879586b 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -381,10 +381,8 @@ static void encode_l12_threshold(u32 threshold_us, u32 *scale, u32 *value) } struct aspm_register_info { - u32 enabled:2; u32 latency_encoding_l0s; u32 latency_encoding_l1; - /* L1 substates */ u32 l1ss_cap_ptr; u32 l1ss_cap; @@ -395,14 +393,11 @@ struct aspm_register_info { static void pcie_get_aspm_reg(struct pci_dev *pdev, struct aspm_register_info *info) { - u16 reg16; u32 reg32; pcie_capability_read_dword(pdev, PCI_EXP_LNKCAP, ®32); info->latency_encoding_l0s = (reg32 & PCI_EXP_LNKCAP_L0SEL) >> 12; info->latency_encoding_l1 = (reg32 & PCI_EXP_LNKCAP_L1EL) >> 15; - pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, ®16); - info->enabled = reg16 & PCI_EXP_LNKCTL_ASPMC; /* Read L1 PM substate capabilities */ info->l1ss_cap = info->l1ss_ctl1 = info->l1ss_ctl2 = 0; @@ -549,6 +544,7 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist) { struct pci_dev *child = link->downstream, *parent = link->pdev; u32 parent_lnkcap, child_lnkcap; + u16 parent_lnkctl, child_lnkctl; struct pci_bus *linkbus = parent->subordinate; struct aspm_register_info upreg, dwreg; @@ -579,6 +575,8 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist) */ pcie_capability_read_dword(parent, PCI_EXP_LNKCAP, &parent_lnkcap); pcie_capability_read_dword(child, PCI_EXP_LNKCAP, &child_lnkcap); + pcie_capability_read_word(parent, PCI_EXP_LNKCTL, &parent_lnkctl); + pcie_capability_read_word(child, PCI_EXP_LNKCTL, &child_lnkctl); pcie_get_aspm_reg(parent, &upreg); pcie_get_aspm_reg(child, &dwreg); @@ -592,9 +590,9 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist) if (parent_lnkcap & child_lnkcap & PCI_EXP_LNKCAP_ASPM_L0S) link->aspm_support |= ASPM_STATE_L0S; - if (dwreg.enabled & PCIE_LINK_STATE_L0S) + if (child_lnkctl & PCI_EXP_LNKCTL_ASPM_L0S) link->aspm_enabled |= ASPM_STATE_L0S_UP; - if (upreg.enabled & PCIE_LINK_STATE_L0S) + if (parent_lnkctl & PCI_EXP_LNKCTL_ASPM_L0S) link->aspm_enabled |= ASPM_STATE_L0S_DW; link->latency_up.l0s = calc_l0s_latency(upreg.latency_encoding_l0s); link->latency_dw.l0s = calc_l0s_latency(dwreg.latency_encoding_l0s); @@ -603,7 +601,7 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist) if (parent_lnkcap & child_lnkcap & PCI_EXP_LNKCAP_ASPM_L1) link->aspm_support |= ASPM_STATE_L1; - if (upreg.enabled & dwreg.enabled & PCIE_LINK_STATE_L1) + if (parent_lnkctl & child_lnkctl & PCI_EXP_LNKCTL_ASPM_L1) link->aspm_enabled |= ASPM_STATE_L1; link->latency_up.l1 = calc_l1_latency(upreg.latency_encoding_l1); link->latency_dw.l1 = calc_l1_latency(dwreg.latency_encoding_l1); |