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672c473576
Rewrite the power.c code. For some reason this was doing locking + refcounting + state (suspended or not) bookkeeping all by itself. But there is no reason for this, this is all taken care of by the runtime-pm core, through pm_runtime_get()/_put(). Besides this not being necessary the DIY code is also quite weird/ buggy in some places. E.g. power_begin() would manually do a resume when not resumed already and force_on=true, followed by a pm_runtime_get(), which will cause a call to gma_power_resume() to get scheduled which would redo the entire resume again. Which can all be replaced by a single pm_runtime_get_sync() call. Note that this is just a cleanup, this does not actually fix the (disabled through #if 0) runtime-pm support. It does now call pm_runtime_enable(), but only after doing a pm_runtime_get() at probe-time, so the device is never runtime suspended. Doing this permanent get() + enable() instead of not calling enable() at all is necessary for the pm_runtime_get_if_in_use() call in gma_power_begin() to work properly. Note this also removes the gma_power_is_on() call a check like this without actually holding a reference is always racy, so it is a bad idea (and therefor has no pm_runtime_foo() equivalent). The 2 code paths which were using gma_power_is_on() are actually both guaranteed to only run when the device is powered-on so the 2 checks can simply be dropped. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220909115646.99920-6-hdegoede@redhat.com
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.