d916b1be94
The nvme pci driver prepares its devices for power loss during suspend by shutting down the controllers. The power setting is deferred to pci driver's power management before the platform removes power. The suspend-to-idle mode, however, does not remove power. NVMe devices that implement host managed power settings can achieve lower power and better transition latencies than using generic PCI power settings. Try to use this feature if the platform is not involved with the suspend. If successful, restore the previous power state on resume. Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Tested-by: Mario Limonciello <mario.limonciello@dell.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> [hch: fixed the compilation for the !CONFIG_PM_SLEEP case] Signed-off-by: Christoph Hellwig <hch@lst.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.