From 39850ed51062f89cd46214a16aaafba5ca49fd6c Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Mon, 7 Dec 2020 14:39:50 -0800 Subject: PCI/PTM: Save/restore Precision Time Measurement Capability for suspend/resume The PCI subsystem does not currently save and restore the configuration space for the Precision Time Measurement (PTM) Extended Capability leading to the possibility of the feature returning disabled on S3 resume. This has been observed on Intel Coffee Lake desktops. Add save/restore of the PTM control register. This saves the PTM Enable, Root Select, and Effective Granularity bits. Suggested-by: Rafael J. Wysocki Link: https://lore.kernel.org/r/20201207223951.19667-1-david.e.box@linux.intel.com Signed-off-by: David E. Box Signed-off-by: Bjorn Helgaas --- drivers/pci/pcie/ptm.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) (limited to 'drivers/pci/pcie') diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c index 357a454cafa0..6b24a1c9327a 100644 --- a/drivers/pci/pcie/ptm.c +++ b/drivers/pci/pcie/ptm.c @@ -29,6 +29,47 @@ static void pci_ptm_info(struct pci_dev *dev) dev->ptm_root ? " (root)" : "", clock_desc); } +void pci_save_ptm_state(struct pci_dev *dev) +{ + int ptm; + struct pci_cap_saved_state *save_state; + u16 *cap; + + if (!pci_is_pcie(dev)) + return; + + ptm = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); + if (!ptm) + return; + + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_PTM); + if (!save_state) { + pci_err(dev, "no suspend buffer for PTM\n"); + return; + } + + cap = (u16 *)&save_state->cap.data[0]; + pci_read_config_word(dev, ptm + PCI_PTM_CTRL, cap); +} + +void pci_restore_ptm_state(struct pci_dev *dev) +{ + struct pci_cap_saved_state *save_state; + int ptm; + u16 *cap; + + if (!pci_is_pcie(dev)) + return; + + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_PTM); + ptm = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); + if (!save_state || !ptm) + return; + + cap = (u16 *)&save_state->cap.data[0]; + pci_write_config_word(dev, ptm + PCI_PTM_CTRL, *cap); +} + void pci_ptm_init(struct pci_dev *dev) { int pos; @@ -65,6 +106,8 @@ void pci_ptm_init(struct pci_dev *dev) if (!pos) return; + pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_PTM, sizeof(u16)); + pci_read_config_dword(dev, pos + PCI_PTM_CAP, &cap); local_clock = (cap & PCI_PTM_GRANULARITY_MASK) >> 8; -- cgit v1.2.3-59-g8ed1b From a697f072f5da8d75467be81bec918eb479405615 Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Mon, 7 Dec 2020 14:39:51 -0800 Subject: PCI: Disable PTM during suspend to save power There are systems (for example, Intel based mobile platforms since Coffee Lake) where the power drawn while suspended can be significantly reduced by disabling Precision Time Measurement (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. To save this power, disable the PTM feature on root ports during pci_prepare_to_sleep() and pci_finish_runtime_suspend(). The feature will be returned to its previous state during restore and error recovery. Suggested-by: Rafael J. Wysocki Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209361 Link: https://lore.kernel.org/r/20201207223951.19667-2-david.e.box@linux.intel.com Reported-by: Len Brown Signed-off-by: David E. Box Signed-off-by: Bjorn Helgaas --- drivers/pci/pci.c | 25 ++++++++++++++++++++++++- drivers/pci/pci.h | 2 ++ drivers/pci/pcie/ptm.c | 17 +++++++++++++++++ 3 files changed, 43 insertions(+), 1 deletion(-) (limited to 'drivers/pci/pcie') 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; } diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index e0f9e7259e47..f38ba693c69a 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -519,9 +519,11 @@ static inline int pci_iov_bus_range(struct pci_bus *bus) #ifdef CONFIG_PCIE_PTM void pci_save_ptm_state(struct pci_dev *dev); void pci_restore_ptm_state(struct pci_dev *dev); +void pci_disable_ptm(struct pci_dev *dev); #else static inline void pci_save_ptm_state(struct pci_dev *dev) { } static inline void pci_restore_ptm_state(struct pci_dev *dev) { } +static inline void pci_disable_ptm(struct pci_dev *dev) { } #endif unsigned long pci_cardbus_resource_alignment(struct resource *); diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c index 6b24a1c9327a..95d4eef2c9e8 100644 --- a/drivers/pci/pcie/ptm.c +++ b/drivers/pci/pcie/ptm.c @@ -29,6 +29,23 @@ static void pci_ptm_info(struct pci_dev *dev) dev->ptm_root ? " (root)" : "", clock_desc); } +void pci_disable_ptm(struct pci_dev *dev) +{ + int ptm; + u16 ctrl; + + if (!pci_is_pcie(dev)) + return; + + ptm = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); + if (!ptm) + return; + + 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); +} + void pci_save_ptm_state(struct pci_dev *dev) { int ptm; -- cgit v1.2.3-59-g8ed1b