1e0465eb16
As talked about in commit d2aacaf07395 ("drm/panel: Check for already
prepared/enabled in drm_panel"), we want to remove needless code from
panel drivers that was storing and double-checking the
prepared/enabled state. Even if someone was relying on the
double-check before, that double-check is now in the core and not
needed in individual drivers.
For the "otm8009a" driver we fully remove the storing of the "enabled"
state and we remove the double-checking, but we still keep the storing
of the "prepared" state since the backlight code in the driver checks
it. This backlight code may not be perfectly safe since there doesn't
appear to be sufficient synchronization between the backlight driver
(which userspace can call into directly) and the code that's
unpreparing the panel. However, this lack of safety is not new and can
be addressed in a future patch.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230804140605.RFC.3.I6a4a3c81c78acf5acdc2e5b5d936e19bf57ec07a@changeid
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.