The state of the device is saved during pci_pm_suspend_noirq(), if it
has not already been saved, regardless of the skip_bus_pm flag value. So
skip_bus_pm check is removed before saving the device state.
Signed-off-by: Rajvi Jingar <[email protected]>
Reviewed-by: Rafael J. Wysocki <[email protected]>
---
v1->v2: no change
v2->v3: no change
---
drivers/pci/pci-driver.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 49238ddd39ee..1f64de3e5280 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -867,20 +867,14 @@ static int pci_pm_suspend_noirq(struct device *dev)
}
}
- if (pci_dev->skip_bus_pm) {
+ if (!pci_dev->state_saved) {
+ pci_save_state(pci_dev);
/*
- * Either the device is a bridge with a child in D0 below it, or
- * the function is running for the second time in a row without
- * going through full resume, which is possible only during
- * suspend-to-idle in a spurious wakeup case. The device should
- * be in D0 at this point, but if it is a bridge, it may be
- * necessary to save its state.
+ * If the device is a bridge with a child in D0 below it, it needs to
+ * stay in D0, so check skip_bus_pm to avoid putting it into a
+ * low-power state in that case.
*/
- if (!pci_dev->state_saved)
- pci_save_state(pci_dev);
- } else if (!pci_dev->state_saved) {
- pci_save_state(pci_dev);
- if (pci_power_manageable(pci_dev))
+ if (!pci_dev->skip_bus_pm && pci_power_manageable(pci_dev))
pci_prepare_to_sleep(pci_dev);
}
--
2.25.1
pci_dev->ptm_enabled needs to be maintained to reflect the current PTM
state of the device. In pci_ptm_disable(), clear ptm_enabled from
'struct pci_dev' on disabling PTM state for the device.
In pci_restore_ptm_state(), set dev->ptm_enabled based on the restored
PTM state of the device.
In pci_ptm_disable(), perform ptm_enabled check to avoid config space
access in case if PTM is already disabled for the device. ptm_enabled
won't be set for non-PCIe devices so pci_is_pcie(dev) check is not
needed anymore.
Signed-off-by: Rajvi Jingar <[email protected]>
Reviewed-by: Rafael J. Wysocki <[email protected]>
---
v1->v2:
- add ptm_enabled check in pci_ptm_disable().
- set the dev->ptm_enabled value in pci_restore_ptm_state().
v2->v3:
- remove pci_is_pcie(dev) check in pci_ptm_disable().
- add Reviewed-by tag in commit message
---
drivers/pci/pcie/ptm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c
index 368a254e3124..1ce241d4538f 100644
--- a/drivers/pci/pcie/ptm.c
+++ b/drivers/pci/pcie/ptm.c
@@ -34,7 +34,7 @@ void pci_disable_ptm(struct pci_dev *dev)
int ptm;
u16 ctrl;
- if (!pci_is_pcie(dev))
+ if (!dev->ptm_enabled)
return;
ptm = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM);
@@ -44,6 +44,7 @@ void pci_disable_ptm(struct pci_dev *dev)
pci_read_config_word(dev, ptm + PCI_PTM_CTRL, &ctrl);
ctrl &= ~(PCI_PTM_CTRL_ENABLE | PCI_PTM_CTRL_ROOT);
pci_write_config_word(dev, ptm + PCI_PTM_CTRL, ctrl);
+ dev->ptm_enabled = 0;
}
void pci_save_ptm_state(struct pci_dev *dev)
@@ -83,6 +84,7 @@ void pci_restore_ptm_state(struct pci_dev *dev)
cap = (u16 *)&save_state->cap.data[0];
pci_write_config_word(dev, ptm + PCI_PTM_CTRL, *cap);
+ dev->ptm_enabled = !!(*cap & PCI_PTM_CTRL_ENABLE);
}
void pci_ptm_init(struct pci_dev *dev)
--
2.25.1