52be9464aa
Currently we try to keep PCIe ports runtime suspended over system suspend if possible. This mostly happens when entering suspend-to-idle because there is no need to re-configure wake settings. This causes problems if the parent port goes into D3cold and it gets resumed upon exit from system suspend. This may happen for example if the port is part of PCIe switch and the same switch is connected to a PCIe endpoint that needs to be resumed. The way exit from D3cold works according PCIe 4.0 spec 5.3.1.4.2 is that power is restored and cold reset is signaled. After this the device is in D0unitialized state keeping PME context if it supports wake from D3cold. The problem occurs when a PCIe hotplug port is left suspended and the parent port goes into D3cold and back to D0: the port keeps its PME context but since everything else is reset back to defaults (D0unitialized) it is not set to detect hotplug events anymore. For this reason change the PCIe portdrv power management logic so that it is fine to keep the port runtime suspended over system suspend but it needs to be resumed upon exit to make sure it gets properly re-initialized. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> |
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| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.