From ac950278b0872c87bcef6153fd9c119265c8ba83 Mon Sep 17 00:00:00 2001 From: Bard Liao Date: Wed, 7 Jun 2023 11:12:41 +0800 Subject: ASoC: add N cpus to M codecs dai link support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Péter Ujfalusi Reviewed-by: Pierre-Louis Bossart Reviewed-by: Ranjani Sridharan Link: https://lore.kernel.org/r/20230607031242.1032060-2-yung-chuan.liao@linux.intel.com Signed-off-by: Mark Brown --- sound/soc/soc-dapm.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) (limited to 'sound/soc/soc-dapm.c') diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index b7b31d4e8ae8..3091e8160bad 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -4444,9 +4444,31 @@ void snd_soc_dapm_connect_dai_link_widgets(struct snd_soc_card *card) for_each_rtd_codec_dais(rtd, i, codec_dai) dapm_connect_dai_pair(card, rtd, codec_dai, asoc_rtd_to_cpu(rtd, i)); + } else if (rtd->dai_link->num_codecs > rtd->dai_link->num_cpus) { + int cpu_id; + + if (!rtd->dai_link->codec_ch_maps) { + dev_err(card->dev, "%s: no codec channel mapping table provided\n", + __func__); + continue; + } + + for_each_rtd_codec_dais(rtd, i, codec_dai) { + cpu_id = rtd->dai_link->codec_ch_maps[i].connected_cpu_id; + if (cpu_id >= rtd->dai_link->num_cpus) { + dev_err(card->dev, + "%s: dai_link %s cpu_id %d too large, num_cpus is %d\n", + __func__, rtd->dai_link->name, cpu_id, + rtd->dai_link->num_cpus); + continue; + } + dapm_connect_dai_pair(card, rtd, codec_dai, + asoc_rtd_to_cpu(rtd, cpu_id)); + } } else { dev_err(card->dev, - "N cpus to M codecs link is not supported yet\n"); + "%s: codec number %d < cpu number %d is not supported\n", + __func__, rtd->dai_link->num_codecs, rtd->dai_link->num_cpus); } } } -- cgit v1.2.3