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PCI/ASPM: Remove struct aspm_register_info.l1ss_cap_ptr

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Save the L1 Substates Capability pointer in struct pci_dev.  Then we don't
have to keep track of it in the struct aspm_register_info and struct
pcie_link_state, which makes the code easier to read.  No functional change
intended.

[bhelgaas: split to a separate patch]
Link: https://lore.kernel.org/r/20201015193039.12585-8-helgaas@kernel.org
Signed-off-by: Saheed O. Bolarinwa <refactormyself@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Saheed O. Bolarinwa 2020-10-15 14:30:34 -05:00 committed by Bjorn Helgaas
parent 5f7875d651
commit ecdf57b4f6
3 changed files with 19 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/pci/pcie/aspm.c
View File

@ -77,8 +77,6 @@ struct pcie_link_state {
/* L1 PM Substate info */
struct {
u32 up_cap_ptr; /* L1SS cap ptr in upstream dev */
u32 dw_cap_ptr; /* L1SS cap ptr in downstream dev */
u32 ctl1; /* value to be programmed in ctl1 */
u32 ctl2; /* value to be programmed in ctl2 */
} l1ss;
@ -386,7 +384,6 @@ static void encode_l12_threshold(u32 threshold_us, u32 *scale, u32 *value)
struct aspm_register_info {
/* L1 substates */
u32 l1ss_cap_ptr;
u32 l1ss_cap;
u32 l1ss_ctl1;
u32 l1ss_ctl2;
@ -397,19 +394,20 @@ static void pcie_get_aspm_reg(struct pci_dev *pdev,
{
/* 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)
if (!pdev->l1ss)
return;
pci_read_config_dword(pdev, info->l1ss_cap_ptr + PCI_L1SS_CAP,
pci_read_config_dword(pdev, pdev->l1ss + PCI_L1SS_CAP,
&info->l1ss_cap);
if (!(info->l1ss_cap & PCI_L1SS_CAP_L1_PM_SS)) {
info->l1ss_cap = 0;
return;
}
pci_read_config_dword(pdev, info->l1ss_cap_ptr + PCI_L1SS_CTL1,
pci_read_config_dword(pdev, pdev->l1ss + PCI_L1SS_CTL1,
&info->l1ss_ctl1);
pci_read_config_dword(pdev, info->l1ss_cap_ptr + PCI_L1SS_CTL2,
pci_read_config_dword(pdev, pdev->l1ss + PCI_L1SS_CTL2,
&info->l1ss_ctl2);
}
@ -494,8 +492,6 @@ 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;
link->l1ss.up_cap_ptr = upreg->l1ss_cap_ptr;
link->l1ss.dw_cap_ptr = dwreg->l1ss_cap_ptr;
link->l1ss.ctl1 = link->l1ss.ctl2 = 0;
if (!(link->aspm_support & ASPM_STATE_L1_2_MASK))
@ -664,8 +660,6 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state)
{
u32 val, enable_req;
struct pci_dev *child = link->downstream, *parent = link->pdev;
u32 up_cap_ptr = link->l1ss.up_cap_ptr;
u32 dw_cap_ptr = link->l1ss.dw_cap_ptr;
enable_req = (link->aspm_enabled ^ state) & state;
@ -683,9 +677,9 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state)
*/
/* Disable all L1 substates */
pci_clear_and_set_dword(child, dw_cap_ptr + PCI_L1SS_CTL1,
pci_clear_and_set_dword(child, child->l1ss + PCI_L1SS_CTL1,
PCI_L1SS_CTL1_L1SS_MASK, 0);
pci_clear_and_set_dword(parent, up_cap_ptr + PCI_L1SS_CTL1,
pci_clear_and_set_dword(parent, parent->l1ss + PCI_L1SS_CTL1,
PCI_L1SS_CTL1_L1SS_MASK, 0);
/*
* If needed, disable L1, and it gets enabled later
@ -701,22 +695,22 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state)
if (enable_req & ASPM_STATE_L1_2_MASK) {
/* Program T_POWER_ON times in both ports */
pci_write_config_dword(parent, up_cap_ptr + PCI_L1SS_CTL2,
pci_write_config_dword(parent, parent->l1ss + PCI_L1SS_CTL2,
link->l1ss.ctl2);
pci_write_config_dword(child, dw_cap_ptr + PCI_L1SS_CTL2,
pci_write_config_dword(child, child->l1ss + PCI_L1SS_CTL2,
link->l1ss.ctl2);
/* Program Common_Mode_Restore_Time in upstream device */
pci_clear_and_set_dword(parent, up_cap_ptr + PCI_L1SS_CTL1,
pci_clear_and_set_dword(parent, parent->l1ss + PCI_L1SS_CTL1,
PCI_L1SS_CTL1_CM_RESTORE_TIME,
link->l1ss.ctl1);
/* Program LTR_L1.2_THRESHOLD time in both ports */
pci_clear_and_set_dword(parent, up_cap_ptr + PCI_L1SS_CTL1,
pci_clear_and_set_dword(parent, parent->l1ss + PCI_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,
pci_clear_and_set_dword(child, child->l1ss + PCI_L1SS_CTL1,
PCI_L1SS_CTL1_LTR_L12_TH_VALUE |
PCI_L1SS_CTL1_LTR_L12_TH_SCALE,
link->l1ss.ctl1);
@ -733,9 +727,9 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state)
val |= PCI_L1SS_CTL1_PCIPM_L1_2;
/* Enable what we need to enable */
pci_clear_and_set_dword(parent, up_cap_ptr + PCI_L1SS_CTL1,
pci_clear_and_set_dword(parent, parent->l1ss + PCI_L1SS_CTL1,
PCI_L1SS_CTL1_L1SS_MASK, val);
pci_clear_and_set_dword(child, dw_cap_ptr + PCI_L1SS_CTL1,
pci_clear_and_set_dword(child, child->l1ss + PCI_L1SS_CTL1,
PCI_L1SS_CTL1_L1SS_MASK, val);
}

3
drivers/pci/probe.c
View File

@ -2106,6 +2106,9 @@ static void pci_configure_ltr(struct pci_dev *dev)
if (!pci_is_pcie(dev))
return;
/* Read L1 PM substate capabilities */
dev->l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS);
pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap);
if (!(cap & PCI_EXP_DEVCAP2_LTR))
return;

1
include/linux/pci.h
View File

@ -380,6 +380,7 @@ 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; /* L1SS Capability pointer */
#endif
unsigned int eetlp_prefix_path:1; /* End-to-End TLP Prefix */