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Since this bridge is tied to the connector, it acts like a passthrough, so concerning the output & input bus formats, either pass the bus formats from the previous bridge or return fallback data like done in the bridge function: drm_atomic_bridge_chain_select_bus_fmts() & select_bus_fmt_recursive. This permits avoiding skipping the negociation if the remaining bridge chain has all the bits in place. Without this bus fmt negociation breaks on drm/meson HDMI pipeline when attaching dw-hdmi with DRM_BRIDGE_ATTACH_NO_CONNECTOR, because the last bridge of the display-connector doesn't implement buf fmt callbacks and MEDIA_BUS_FMT_FIXED is used leading to select an unsupported default bus format from dw-hdmi. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20211020123947.2585572-2-narmstrong@baylibre.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.