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ASoC: SOF: Intel: Read the LLP via the associated Link DMA channel #5539

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Merged
bardliao merged 1 commit into from
Sep 22, 2025
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ASoC: SOF: Intel: Read the LLP via the associated Link DMA channel #5539

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29 changes: 27 additions & 2 deletions sound/soc/sof/intel/hda-stream.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1129,10 +1129,35 @@ u64 hda_dsp_get_stream_llp(struct snd_sof_dev *sdev,
struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct hdac_stream *hstream = substream->runtime->private_data;
struct hdac_ext_stream *hext_stream = stream_to_hdac_ext_stream(hstream);
struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
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@ranj063 ranj063 Sep 18, 2025

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@ujfalusi this makes perfect sense. You just have a minor typo in the commit message, otherwise good to go: "fro"

struct snd_soc_pcm_runtime *be_rtd = NULL;
struct hdac_ext_stream *hext_stream;
struct snd_soc_dai *cpu_dai;
struct snd_soc_dpcm *dpcm;
u32 llp_l, llp_u;

/*
* The LLP needs to be read from the Link DMA used for this FE as it is
* allowed to use any combination of Link and Host channels
*/
for_each_dpcm_be(rtd, substream->stream, dpcm) {
if (dpcm->fe != rtd)
continue;

be_rtd = dpcm->be;
}

if (!be_rtd)
return 0;

cpu_dai = snd_soc_rtd_to_cpu(be_rtd, 0);
if (!cpu_dai)
return 0;

hext_stream = snd_soc_dai_get_dma_data(cpu_dai, substream);
if (!hext_stream)
return 0;

/*
* The pplc_addr have been calculated during probe in
* hda_dsp_stream_init():
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