From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> This is some rework of David's series to preserve ASPM L1 substate configuration across suspend/resume. We've had several attempts to make this work: (unlabeled): https://lore.kernel.org/r/20240128233212.1139663-1-david.e.box@xxxxxxxxxxxxxxx v5: https://lore.kernel.org/r/20231221011250.191599-1-david.e.box@xxxxxxxxxxxxxxx v4: https://lore.kernel.org/all/20231002070044.2299644-1-mika.westerberg@xxxxxxxxxxxxxxx/ v3: https://lore.kernel.org/linux-pci/20230925074636.2893747-1-mika.westerberg@xxxxxxxxxxxxxxx/ v2: https://lore.kernel.org/linux-pci/20230911073352.3472918-1-mika.westerberg@xxxxxxxxxxxxxxx/ v1: https://lore.kernel.org/linux-pci/20230627062442.54008-1-mika.westerberg@xxxxxxxxxxxxxxx/ The most recent posting is the unlabeled one mentioned above, and I'm calling it v6 and this rework v7. Changes since the unlabeled v6: - Rename pci_save_aspm_state() to pci_save_aspm_l1ss_state() (this is the reason for opening this again, because Vidya's patch [1] had to do some incidental renaming). - Rename pcie_restore_aspm_l1ss() to pci_restore_aspm_l1ss_state() to match. - Move the PCI_EXP_LNKCTL_ASPMC from pci_restore_aspm_state() to pci_restore_pcie_state() so both writes are in the same place. - Rename pci_aspm_get_l1ss() to pci_configure_aspm_l1ss() and add the save_buffer there as well. - Split [1/5] into two patches: move pci_configure_ltr() and pci_bridge_reconfigure_ltr() to aspm.c, and build aspm.c unconditionally. - Squash [2/5] and [3/5] since [2/5] didn't add any functionality itself so they seem like a single logical change. [1] https://lore.kernel.org/r/20230125133830.20620-1-vidyas@xxxxxxxxxx David E. Box (5): PCI/ASPM: Move pci_configure_ltr() to aspm.c PCI/ASPM: Always build aspm.c PCI/ASPM: Move pci_save_ltr_state() to aspm.c PCI/ASPM: Save L1 PM Substates Capability for suspend/resume PCI/ASPM: Call pci_save_ltr_state() from pci_save_pcie_state() drivers/pci/pci.c | 89 ++++------------ drivers/pci/pci.h | 13 ++- drivers/pci/pcie/Makefile | 2 +- drivers/pci/pcie/aspm.c | 215 ++++++++++++++++++++++++++++++++++++++ drivers/pci/probe.c | 62 +---------- include/linux/pci.h | 2 +- 6 files changed, 252 insertions(+), 131 deletions(-) -- 2.34.1
