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If we focus to soc_bind_dai_link() at snd_soc_instantiate_card(),
we will notice very complex operation.
static int snd_soc_instantiate_card(...)
{
...
/*
* (1) Bind dai_link via card pre-linked dai_link
*
* Bind dai_link via card pre-linked.
* 1 dai_link will be 1 rtd, and connected to card.
* for_each_card_prelinks() is for card pre-linked dai_link.
*
* Image
*
* card
* - rtd(A)
* - rtd(A)
*/
for_each_card_prelinks(card, i, dai_link) {
ret = soc_bind_dai_link(card, dai_link);
...
}
...
/*
* (2) Connect card pre-linked dai_link to card list
*
* Connect all card pre-linked dai_link to *card list*.
* Here, (A) means from card pre-linked.
*
* Image
*
* card card list
* - rtd(A) - dai_link(A)
* - rtd(A) - dai_link(A)
* - ... - ...
*/
for_each_card_prelinks(card, i, dai_link) {
ret = snd_soc_add_dai_link(card, dai_link);
...
}
...
/*
* (3) Probe binded component
*
* Each rtd has many components.
* Here probes each rtd connected components.
* rtd(A) in Image is the probe target.
*
* During this component probe, topology may add new dai_link to
* *card list* by using snd_soc_add_dai_link() which is
* used at (2).
* Here, (B) means from topology
*
* Image
*
* card card list
* - rtd(A) - dai_link(A)
* - rtd(A) - dai_link(A)
* - ... - ...
* - dai_link(B)
* - dai_link(B)
*/
ret = soc_probe_link_components(card);
...
/*
* (4) Bind dai_link again
*
* Bind dai_link again for topology.
* Note, (1) used for_each_card_prelinks(),
* here is using for_each_card_links()
*
* This means from card list.
* As Image indicating, it has dai_link(A) (from card pre-link)
* and dai_link(B) (from topology).
* main target here is dai_link(B).
* soc_bind_dai_link() ignores already used
* dai_link (= dai_link(A))
*
* Image
*
* card card list
* - rtd(A) - dai_link(A)
* - rtd(A) - dai_link(A)
* - ... - ...
* - rtd(B) - dai_link(B)
* - rtd(B) - dai_link(B)
*/
for_each_card_links(card, dai_link) {
ret = soc_bind_dai_link(card, dai_link);
...
}
...
}
As you see above, it is doing very complex method.
The problem is binding dai_link via "card pre-linked" (= (1)) and
"topology added dai_link" (= (3)) are separated.
The code can be simple if we can bind dai_link when dai_link
is connected to *card list*.
This patch do it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/878sou3jnn.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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.