diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 12ba6351c05b..71dd5d7cbded 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2608,12 +2608,24 @@ int pci_prepare_to_sleep(struct pci_dev *dev) if (target_state == PCI_POWER_ERROR) return -EIO; + /* + * There are systems (for example, Intel mobile chips since Coffee + * Lake) where the power drawn while suspended can be significantly + * reduced by disabling PTM on PCIe root ports as this allows the + * port to enter a lower-power PM state and the SoC to reach a + * lower-power idle state as a whole. + */ + if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) + pci_disable_ptm(dev); + pci_enable_wake(dev, target_state, wakeup); error = pci_set_power_state(dev, target_state); - if (error) + if (error) { pci_enable_wake(dev, target_state, false); + pci_restore_ptm_state(dev); + } return error; } @@ -2651,12 +2663,23 @@ int pci_finish_runtime_suspend(struct pci_dev *dev) dev->runtime_d3cold = target_state == PCI_D3cold; + /* + * There are systems (for example, Intel mobile chips since Coffee + * Lake) where the power drawn while suspended can be significantly + * reduced by disabling PTM on PCIe root ports as this allows the + * port to enter a lower-power PM state and the SoC to reach a + * lower-power idle state as a whole. + */ + if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) + pci_disable_ptm(dev); + __pci_enable_wake(dev, target_state, pci_dev_run_wake(dev)); error = pci_set_power_state(dev, target_state); if (error) { pci_enable_wake(dev, target_state, false); + pci_restore_ptm_state(dev); dev->runtime_d3cold = false; } |