From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
This reverts commit 4ff116d0d5fd8a025604b0802d93a2d5f4e465d1.
Thomas Witt reported that 5e85eba6f50d ("PCI/ASPM: Refactor L1 PM Substates
Control Register programming") broke suspend/resume.
4ff116d0d5fd ("PCI/ASPM: Save L1 PM Substates Capability for
suspend/resume") uses a function added by 5e85eba6f50d, so revert it first.
Note that reverting 4ff116d0d5fd means L1 Substates config will be lost on
suspend/resume. As far as we know the box will use more power but will
still *work* correctly.
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=216877
Reported-by: Thomas Witt <kernel@xxxxxxxxx>
Tested-by: Thomas Witt <kernel@xxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Vidya Sagar <vidyas@xxxxxxxxxx>
---
drivers/pci/pci.c | 7 -------
drivers/pci/pci.h | 4 ----
drivers/pci/pcie/aspm.c | 37 -------------------------------------
3 files changed, 48 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index fba95486caaf..5641786bd020 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1665,7 +1665,6 @@ int pci_save_state(struct pci_dev *dev)
return i;
pci_save_ltr_state(dev);
- pci_save_aspm_l1ss_state(dev);
pci_save_dpc_state(dev);
pci_save_aer_state(dev);
pci_save_ptm_state(dev);
@@ -1772,7 +1771,6 @@ void pci_restore_state(struct pci_dev *dev)
* LTR itself (in the PCIe capability).
*/
pci_restore_ltr_state(dev);
- pci_restore_aspm_l1ss_state(dev);
pci_restore_pcie_state(dev);
pci_restore_pasid_state(dev);
@@ -3465,11 +3463,6 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev)
if (error)
pci_err(dev, "unable to allocate suspend buffer for LTR\n");
- error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS,
- 2 * sizeof(u32));
- if (error)
- pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n");
-
pci_allocate_vc_save_buffers(dev);
}
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 9ed3b5550043..9049d07d3aae 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -566,14 +566,10 @@ bool pcie_wait_for_link(struct pci_dev *pdev, bool active);
void pcie_aspm_init_link_state(struct pci_dev *pdev);
void pcie_aspm_exit_link_state(struct pci_dev *pdev);
void pcie_aspm_powersave_config_link(struct pci_dev *pdev);
-void pci_save_aspm_l1ss_state(struct pci_dev *dev);
-void pci_restore_aspm_l1ss_state(struct pci_dev *dev);
#else
static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { }
static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { }
static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { }
-static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { }
-static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { }
#endif
#ifdef CONFIG_PCIE_ECRC
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 53a1fa306e1e..915cbd939dd9 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -757,43 +757,6 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state)
PCI_L1SS_CTL1_L1SS_MASK, val);
}
-void pci_save_aspm_l1ss_state(struct pci_dev *dev)
-{
- struct pci_cap_saved_state *save_state;
- u16 l1ss = dev->l1ss;
- u32 *cap;
-
- if (!l1ss)
- return;
-
- save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS);
- if (!save_state)
- return;
-
- cap = (u32 *)&save_state->cap.data[0];
- pci_read_config_dword(dev, l1ss + PCI_L1SS_CTL2, cap++);
- pci_read_config_dword(dev, l1ss + PCI_L1SS_CTL1, cap++);
-}
-
-void pci_restore_aspm_l1ss_state(struct pci_dev *dev)
-{
- struct pci_cap_saved_state *save_state;
- u32 *cap, ctl1, ctl2;
- u16 l1ss = dev->l1ss;
-
- if (!l1ss)
- return;
-
- save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS);
- if (!save_state)
- return;
-
- cap = (u32 *)&save_state->cap.data[0];
- ctl2 = *cap++;
- ctl1 = *cap;
- aspm_program_l1ss(dev, ctl1, ctl2);
-}
-
static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val)
{
pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL,
--
2.25.1
