ASoC: fsl_asrc_dma: get codec or cpu dai from backend

JIRA: https://issues.redhat.com/browse/RHEL-80657

commit ef5c23a
Author: Shengjiu Wang <shengjiu.wang@nxp.com>
Date: Wed Mar 19 11:35:04 2025 +0800

    ASoC: fsl_asrc_dma: get codec or cpu dai from backend

    With audio graph card, original cpu dai is changed to codec device in
    backend, so if cpu dai is dummy device in backend, get the codec dai
    device, which is the real hardware device connected.

    The specific case is ASRC->SAI->AMIX->CODEC.

    Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
    Link: https://patch.msgid.link/20250319033504.2898605-1-shengjiu.wang@nxp.com
    Signed-off-by: Mark Brown <broonie@kernel.org>

Signed-off-by: Jaroslav Kysela <jkysela@redhat.com>

Author: jkysela-rh

sound/soc/fsl/fsl_asrc_dma.c

@@ -156,11 +156,24 @@ static int fsl_asrc_dma_hw_params(struct snd_soc_component *component,
 	for_each_dpcm_be(rtd, stream, dpcm) {
 		struct snd_soc_pcm_runtime *be = dpcm->be;
 		struct snd_pcm_substream *substream_be;
-		struct snd_soc_dai *dai = snd_soc_rtd_to_cpu(be, 0);
+		struct snd_soc_dai *dai_cpu = snd_soc_rtd_to_cpu(be, 0);
+		struct snd_soc_dai *dai_codec = snd_soc_rtd_to_codec(be, 0);
+		struct snd_soc_dai *dai;
 
 		if (dpcm->fe != rtd)
 			continue;
 
+		/*
+		 * With audio graph card, original cpu dai is changed to codec
+		 * device in backend, so if cpu dai is dummy device in backend,
+		 * get the codec dai device, which is the real hardware device
+		 * connected.
+		 */
+		if (!snd_soc_dai_is_dummy(dai_cpu))
+			dai = dai_cpu;
+		else
+			dai = dai_codec;
+
 		substream_be = snd_soc_dpcm_get_substream(be, stream);
 		dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be);
 		dev_be = dai->dev;