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| author | Bjorn Helgaas <bhelgaas@google.com> | 2017-11-13 08:36:40 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-11-14 08:32:47 -0600 |
| commit | a48f3d5b197494d903c97ff7bc0909dac65740f8 (patch) | |
| tree | 96cda0b6c952870e9d7614169b9caaebb673688e /drivers | |
| parent | 7f88ba4a19b91d310eca836b647edeb100c61c8d (diff) | |
| download | linux-stable-a48f3d5b197494d903c97ff7bc0909dac65740f8.tar.gz linux-stable-a48f3d5b197494d903c97ff7bc0909dac65740f8.tar.bz2 linux-stable-a48f3d5b197494d903c97ff7bc0909dac65740f8.zip | |
PCI/ASPM: Add L1 Substates definitions
Add and use #defines for L1 Substate register fields instead of hard-coding
the masks. Also update comments to use names from the spec. No functional
change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index a378dd9d2473..d240ffab24c1 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -450,24 +450,25 @@ static void aspm_calc_l1ss_info(struct pcie_link_state *link, if (!(link->aspm_support & ASPM_STATE_L1_2_MASK)) return; - /* Choose the greater of the two T_cmn_mode_rstr_time */ - val1 = (upreg->l1ss_cap >> 8) & 0xFF; - val2 = (dwreg->l1ss_cap >> 8) & 0xFF; + /* 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; if (val1 > val2) link->l1ss.ctl1 |= val1 << 8; else link->l1ss.ctl1 |= val2 << 8; + /* * We currently use LTR L1.2 threshold to be fixed constant picked from * Intel's coreboot. */ link->l1ss.ctl1 |= LTR_L1_2_THRESHOLD_BITS; - /* Choose the greater of the two T_pwr_on */ - val1 = (upreg->l1ss_cap >> 19) & 0x1F; - scale1 = (upreg->l1ss_cap >> 16) & 0x03; - val2 = (dwreg->l1ss_cap >> 19) & 0x1F; - scale2 = (dwreg->l1ss_cap >> 16) & 0x03; + /* 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; if (calc_l1ss_pwron(link->pdev, scale1, val1) > calc_l1ss_pwron(link->downstream, scale2, val2)) @@ -646,21 +647,26 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) if (enable_req & ASPM_STATE_L1_2_MASK) { - /* Program T_pwr_on in both ports */ + /* Program T_POWER_ON times in both ports */ pci_write_config_dword(parent, up_cap_ptr + PCI_L1SS_CTL2, link->l1ss.ctl2); pci_write_config_dword(child, dw_cap_ptr + PCI_L1SS_CTL2, link->l1ss.ctl2); - /* Program T_cmn_mode in parent */ + /* Program Common_Mode_Restore_Time in upstream device */ pci_clear_and_set_dword(parent, up_cap_ptr + PCI_L1SS_CTL1, - 0xFF00, link->l1ss.ctl1); + PCI_L1SS_CTL1_CM_RESTORE_TIME, + link->l1ss.ctl1); - /* Program LTR L1.2 threshold in both ports */ + /* Program LTR_L1.2_THRESHOLD time in both ports */ pci_clear_and_set_dword(parent, up_cap_ptr + PCI_L1SS_CTL1, - 0xE3FF0000, link->l1ss.ctl1); + PCI_L1SS_CTL1_LTR_L12_TH_VALUE | + PCI_L1SS_CTL1_LTR_L12_TH_SCALE, + link->l1ss.ctl1); pci_clear_and_set_dword(child, dw_cap_ptr + PCI_L1SS_CTL1, - 0xE3FF0000, link->l1ss.ctl1); + PCI_L1SS_CTL1_LTR_L12_TH_VALUE | + PCI_L1SS_CTL1_LTR_L12_TH_SCALE, + link->l1ss.ctl1); } val = 0; |