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According to the include/drm/drm_bridge.h, the following functions
are mandatory in atomic mode:
&drm_bridge_funcs.atomic_reset()
&drm_bridge_funcs.atomic_duplicate_state()
&drm_bridge_funcs.atomic_destroy_state()
For some bridge drivers that have not supported atomic mode yet:
drivers/gpu/drm/bridge/sii902x.c
drivers/gpu/drm/bridge/rk630-tve.c
......
The drm_atomic_get_bridge_state() should not be called to get the
bridge state by the global atomic state. Without this patch, the null
pointer exception will occur.
Fixes: 3558926745 ("drm/rockchip: logo: call drm_atomic_bridge_chain_check() bridge in mode fixup")
Change-Id: I68c953db21a95bf5454fc47c65958dee9d13a8ce
Signed-off-by: Damon Ding <damon.ding@rock-chips.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.