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PCI/ASPM: Remove struct aspm_register_info.latency_encoding 

Previously we stored L0s and L1 Exit Latency information from the Link
Capabilities register in the struct aspm_register_info.

We only need these latencies when we already have the Link Capabilities
values, so use those directly and remove the latencies from struct
aspm_register_info.  No functional change intended.

Link: https://lore.kernel.org/r/20201015193039.12585-7-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 14:30:33 -05:00 коммит произвёл Bjorn Helgaas
Родитель 67bcc9ad68
Коммит 5f7875d651
1 изменённых файлов: 10 добавлений и 14 удалений
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24
drivers/pci/pcie/aspm.c
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@ -308,8 +308,10 @@ static void pcie_aspm_configure_common_clock(struct pcie_link_state *link)
}
/* Convert L0s latency encoding to ns */
static u32 calc_l0s_latency(u32 encoding)
static u32 calc_l0s_latency(u32 lnkcap)
{
u32 encoding = (lnkcap & PCI_EXP_LNKCAP_L0SEL) >> 12;
if (encoding == 0x7)
return (5 * 1000); /* > 4us */
return (64 << encoding);
@ -324,8 +326,10 @@ static u32 calc_l0s_acceptable(u32 encoding)
}
/* Convert L1 latency encoding to ns */
static u32 calc_l1_latency(u32 encoding)
static u32 calc_l1_latency(u32 lnkcap)
{
u32 encoding = (lnkcap & PCI_EXP_LNKCAP_L1EL) >> 15;
if (encoding == 0x7)
return (65 * 1000); /* > 64us */
return (1000 << encoding);
@ -381,8 +385,6 @@ static void encode_l12_threshold(u32 threshold_us, u32 *scale, u32 *value)
}
struct aspm_register_info {
u32 latency_encoding_l0s;
u32 latency_encoding_l1;
/* L1 substates */
u32 l1ss_cap_ptr;
u32 l1ss_cap;
@ -393,12 +395,6 @@ struct aspm_register_info {
static void pcie_get_aspm_reg(struct pci_dev *pdev,
struct aspm_register_info *info)
{
u32 reg32;
pcie_capability_read_dword(pdev, PCI_EXP_LNKCAP, &reg32);
info->latency_encoding_l0s = (reg32 & PCI_EXP_LNKCAP_L0SEL) >> 12;
info->latency_encoding_l1 = (reg32 & PCI_EXP_LNKCAP_L1EL) >> 15;
/* 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);
@ -594,8 +590,8 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
link->aspm_enabled |= ASPM_STATE_L0S_UP;
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);
link->latency_up.l0s = calc_l0s_latency(parent_lnkcap);
link->latency_dw.l0s = calc_l0s_latency(child_lnkcap);
/* Setup L1 state */
if (parent_lnkcap & child_lnkcap & PCI_EXP_LNKCAP_ASPM_L1)
@ -603,8 +599,8 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
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);
link->latency_up.l1 = calc_l1_latency(parent_lnkcap);
link->latency_dw.l1 = calc_l1_latency(child_lnkcap);
/* Setup L1 substate
* If we don't have LTR for the entire path from the Root Complex