diff options
| author | Bard Liao <yung-chuan.liao@linux.intel.com> | 2023-06-07 11:12:41 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-06-13 12:11:15 +0100 |
| commit | ac950278b0872c87bcef6153fd9c119265c8ba83 (patch) | |
| tree | fba11f9cc381cd193afc6053bdaf54d313268220 /include/sound | |
| parent | 597d364cd7b447aff5668639b90ec33ea420eaa2 (diff) | |
ASoC: add N cpus to M codecs dai link support
Currently, ASoC supports dailinks with the following mappings:
1 cpu DAI to N codec DAIs
N cpu DAIs to N codec DAIs
But the mapping between N cpu DAIs and M codec DAIs is not supported.
The reason is that we didn't have a mechanism to map cpu and codec DAIs
This patch suggests a new snd_soc_dai_link_codec_ch_map struct in
struct snd_soc_dai_link{} which provides codec DAI to cpu DAI mapping
information used to implement N cpu DAIs to M codec DAIs
support.
When a dailink contains two or more cpu DAIs, we should set channel
number of cpus based on its channel mask. The new struct also provides
channel mask information for each codec and we can construct the cpu
channel mask by combining all codec channel masks which map to the cpu.
The N:M mapping is however restricted to the N <= M case due to physical
restrictions on a time-multiplexed bus such as I2S/TDM, AC97, SoundWire
and HDaudio.
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.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/20230607031242.1032060-2-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/sound')
| -rw-r--r-- | include/sound/soc.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/sound/soc.h b/include/sound/soc.h index 10e4ea0664af..1e48a1135844 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -645,6 +645,11 @@ struct snd_soc_dai_link_component { const char *dai_name; }; +struct snd_soc_dai_link_codec_ch_map { + unsigned int connected_cpu_id; + unsigned int ch_mask; +}; + struct snd_soc_dai_link { /* config - must be set by machine driver */ const char *name; /* Codec name */ @@ -673,6 +678,7 @@ struct snd_soc_dai_link { struct snd_soc_dai_link_component *codecs; unsigned int num_codecs; + struct snd_soc_dai_link_codec_ch_map *codec_ch_maps; /* * You MAY specify the link's platform/PCM/DMA driver, either by * device name, or by DT/OF node, but not both. Some forms of link |