dfd2edccfd
Panel drivers can send DSI commands in panel's prepare(), which happens before the bridge's enable() is called. The OMAP DSI driver currently only sets up the DSI interface at bridge's enable(), so prepare() cannot be used to send DSI commands. This patch fixes the issue by making it possible to enable the DSI interface any time a command is about to be sent. Disabling the interface is be done via delayed work. Clarifications for the delayed disable work and the panel doing DSI transactions: bridge_enable: If the disable callback is called just before bridge_enable takes the dsi_bus_lock, no problem, bridge_enable just enables the interface again. If the callback is ran just after bridge_enable's dsi_bus_unlock, no problem, dsi->video_enabled == true so the callback does nothing. bridge_disable: similar to bridge-enable, the callback won't do anything if video_enabled == true, and after bridge-disable has turned the video and the interface off, there's nothing to do for the callback. omap_dsi_host_detach: this is called when the panel does mipi_dsi_detach(), and we expect the panel to _not_ do any DSI transactions after (or during) mipi_dsi_detatch(), so there are no race conditions. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201215104657.802264-85-tomi.valkeinen@ti.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.