Here's the second installment of this series, based on feedback from Rafael. (Thanks!) To reiterate, these refinements are meant to speed up and reduce power consumption when entering and leaving system sleep and when shutting down the system. For details, please refer to the cover letter of v1: http://www.spinics.net/lists/linux-pci/msg53702.html As usual I've pushed the patches to GitHub in case anyone prefers reviewing in a GUI: https://github.com/l1k/linux/commits/pci_pm_refinements_v2 Changes since v1: * Patch [1/5] now sports an ack by Rafael. * Patch [2/5]: * In acpi_pci_get_power_state(), only check for ACPI_STATE_UNKNOWN instead of ACPI_STATE_D0 and ACPI_STATE_D3_COLD. * Move the change to pci_update_current_state() to new patch [3/5]. * Patch [3/5]: * Instead of solely relying on the platform firmware to report D3cold, also probe the vendor ID and assume D3cold if it can't be read. This should ensure proper detection of D3cold on pre-ACPI 4.0 platforms (which will never report anything deeper than D3hot) as well as for devices with nonstandard PM mechanisms. * The two existing workarounds for D3cold are removed from pci_update_current_state(), as explained in the commit message. * Patch [5/5]: * Disable runtime PM on the device to prevent it from being runtime resumed during the remainder of the shutdown process. Thanks, Lukas Lukas Wunner (5): PCI: Afford direct-complete to devices with nonstandard PM PCI: Query platform firmware for device power state PCI: Recognize D3cold in pci_update_current_state() PCI: Avoid unnecessary resume after direct-complete PCI: Avoid unnecessary resume on shutdown drivers/pci/pci-acpi.c | 22 ++++++++++++++++++++ drivers/pci/pci-driver.c | 24 ++++++++++++++++++++-- drivers/pci/pci.c | 52 ++++++++++++++++++++++++++++++++---------------- drivers/pci/pci.h | 3 +++ 4 files changed, 82 insertions(+), 19 deletions(-) -- 2.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
