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ALSA: docs: Extend module parameters description

Common ALSA module parameters look a little bit confusing because of the
description lacking, and it took me a while to understand the purpose of
their existence. To figure it out I asked the question about them to the
"alsa-devel" mailing list, and Takashi Iwai answered me with the text I
appended to the ALSA documentation in this patch.

These common module parameters aren't used a lot nowadays, but as I
understand they are important for providing compatibility with some
existing user-space apps. So in my opinion it is a good idea to document
why we need them.

Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Link: https://lore.kernel.org/r/20230501101634.476297-1-ivan.orlov0322@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

authored by

Ivan Orlov and committed by
Takashi Iwai 1604f51b 7e2d0662

+13
+13
Documentation/sound/alsa-configuration.rst
··· 133 133 enable card; 134 134 Default: enabled, for PCI and ISA PnP cards 135 135 136 + These options are used for either specifying the order of instances or 137 + controlling enabling and disabling of each one of the devices if there 138 + are multiple devices bound with the same driver. For example, there are 139 + many machines which have two HD-audio controllers (one for HDMI/DP 140 + audio and another for onboard analog). In most cases, the second one is 141 + in primary usage, and people would like to assign it as the first 142 + appearing card. They can do it by specifying "index=1,0" module 143 + parameter, which will swap the assignment slots. 144 + 145 + Today, with the sound backend like PulseAudio and PipeWire which 146 + supports dynamic configuration, it's of little use, but that was a 147 + help for static configuration in the past. 148 + 136 149 Module snd-adlib 137 150 ---------------- 138 151