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This patch make it possible for non-acomp codecs to set dyn_pcm_assign/dp_mst and get DP-MST audio support. Document change notification HDA040-A for the Intel High Definition Audio 1.0a specification introduces a Device Select verb for Digital Display Pin Widgets that are multi-stream capable. This verb selects a Device Entry that is used by subsequent Pin Widget verbs. Once the Device Entry is selected, all subsequent Pin Widget verbs controlling the sink device will be directed to the selected Device Entry until the Device Select verb is updated with a new value. These Pin Widget verbs include: * Connection Select * Get Connection List Entry * Amplifier Gain/Mute * Power State * Pin Widget Control * ELD Data * DIP-Size * DIP-Index * DIP-Data * DIP-XmitCtrl * Content Protection Control * ASP Channel Mapping This patch adds calls to snd_hda_set_dev_select() to direct each of these Pin Widget control verbs to the correct Device Entry. snd_hda_get_connections() does not return per-device connection list, therefore make use snd_hda_get_raw_connections() instead of snd_hda_get_connections(). Signed-off-by: Nikhil Mahale <nmahale@nvidia.com> Reviewed-by: Aaron Plattner <aplattner@nvidia.com> Link: https://lore.kernel.org/r/20191119084710.29267-4-nmahale@nvidia.com Signed-off-by: Takashi Iwai <tiwai@suse.de> |
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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.