781bf4cee3
Fix probe()/remove() power-management: -Currently the driver uses pm_runtime_put_noidle() and relies on userspace to open + close the /dev/video# node at least once to actually turn the ISP off. Replace the pm_runtime_put_noidle() with pm_runtime_put_sync() to make sure that the device is turned off without relying on userspace for this. This also ensures that atomisp_css_init() is run (by atomisp_power_on()) if the first userspace process opening /dev/video# wants to do more then just query the v4l2-caps. As part of this change move the pm setup code in probe() to just before calling v4l2_async_nf_register() which registers the /dev/* nodes, so that the device is left on for the entirety of the probe() function. -Remove the turning off of the atomisp from the exit-error path, the PCI subsystem and subsequent probe() attempts expect the device to be in the on state when probe() fails. This also fixes the atomisp driver causing the system to hang / freeze when its firmware is missing. This freeze is caused by an unidentified bug in the power-off on exit-error code which is now removed. -Make sure that remove() properly powers on the device by replacing pm_runtime_get_noresume() with pm_runtime_get_sync. The PCI subsystem and subsequent probe() attempts expect the device to be in the on state after unbinding the driver. -Note this also swaps the order of put()/allow() and forbid()/get() so that the sync versions actually work by calling allow() before put() and forbid() after get() 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.