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The atomisp does not use standard PCI power-management through the PCI config space. Instead this driver directly tells the P-Unit to disable the ISP over the IOSF. The standard PCI subsystem pm_ops will try to access the config space before (resume) / after (suspend) this driver has turned the ISP on / off, resulting in the following errors: Unable to change power state from D0 to D3hot, device inaccessible Unable to change power state from D3cold to D0, device inaccessible Getting logged into dmesg a whole bunch of time during boot as well as every time the camera is used. To avoid these errors use a custom pm_domain instead of standard driver pm-callbacks so that all the PCI subsys suspend / resume handling is skipped and call pci_save_state() / pci_restore_state() ourselves. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
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.