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Subject[PATCH 3/4] ASoC: pcm: Export parameter intersection logic
Date
The logic to calculate the subset of stream parameters supported by all
DAIs associated with a PCM stream is nontrivial. Export a helper
function so it can be used to set up simple codec2codec DAI links.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
include/sound/soc.h | 3 +++
sound/soc/soc-pcm.c | 53 ++++++++++++++++++++++++++++++++-------------
2 files changed, 41 insertions(+), 15 deletions(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 262896799826..578a8e3e08ca 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -473,6 +473,9 @@ bool snd_soc_runtime_ignore_pmdown_time(struct snd_soc_pcm_runtime *rtd);
void snd_soc_runtime_activate(struct snd_soc_pcm_runtime *rtd, int stream);
void snd_soc_runtime_deactivate(struct snd_soc_pcm_runtime *rtd, int stream);

+int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
+ struct snd_pcm_hardware *hw, int stream);
+
int snd_soc_runtime_set_dai_fmt(struct snd_soc_pcm_runtime *rtd,
unsigned int dai_fmt);

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index bd7b3cfcfa62..562af1d3f24e 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -348,11 +348,18 @@ static void soc_pcm_apply_msb(struct snd_pcm_substream *substream)
soc_pcm_set_msb(substream, cpu_bits);
}

-static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
+/**
+ * snd_soc_runtime_calc_hw() - Calculate hw limits for a PCM stream
+ * @rtd: ASoC PCM runtime
+ * @hw: PCM hardware parameters (output)
+ * @stream: Direction of the PCM stream
+ *
+ * Calculates the subset of stream parameters supported by all DAIs
+ * associated with the PCM stream.
+ */
+int snd_soc_runtime_calc_hw(struct snd_soc_pcm_runtime *rtd,
+ struct snd_pcm_hardware *hw, int stream)
{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct snd_pcm_hardware *hw = &runtime->hw;
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *codec_dai;
struct snd_soc_dai_driver *cpu_dai_drv = rtd->cpu_dai->driver;
struct snd_soc_dai_driver *codec_dai_drv;
@@ -364,7 +371,7 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
u64 formats = ULLONG_MAX;
int i;

- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
cpu_stream = &cpu_dai_drv->playback;
else
cpu_stream = &cpu_dai_drv->capture;
@@ -377,16 +384,12 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
* Otherwise, since the rate, channel, and format values will
* zero in that case, we would have no usable settings left,
* causing the resulting setup to fail.
- * At least one CODEC should match, otherwise we should have
- * bailed out on a higher level, since there would be no
- * CODEC to support the transfer direction in that case.
*/
- if (!snd_soc_dai_stream_valid(codec_dai,
- substream->stream))
+ if (!snd_soc_dai_stream_valid(codec_dai, stream))
continue;

codec_dai_drv = codec_dai->driver;
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
codec_stream = &codec_dai_drv->playback;
else
codec_stream = &codec_dai_drv->capture;
@@ -398,6 +401,9 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
}

+ if (!chan_min)
+ return -EINVAL;
+
/*
* chan min/max cannot be enforced if there are multiple CODEC DAIs
* connected to a single CPU DAI, use CPU DAI's directly and let
@@ -410,10 +416,7 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)

hw->channels_min = max(chan_min, cpu_stream->channels_min);
hw->channels_max = min(chan_max, cpu_stream->channels_max);
- if (hw->formats)
- hw->formats &= formats & cpu_stream->formats;
- else
- hw->formats = formats & cpu_stream->formats;
+ hw->formats = formats & cpu_stream->formats;
hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_stream->rates);

snd_pcm_limit_hw_rates(hw);
@@ -422,6 +425,26 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
hw->rate_min = max(hw->rate_min, rate_min);
hw->rate_max = min_not_zero(hw->rate_max, cpu_stream->rate_max);
hw->rate_max = min_not_zero(hw->rate_max, rate_max);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_runtime_calc_hw);
+
+static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_hardware *hw = &substream->runtime->hw;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ u64 formats = hw->formats;
+
+ /*
+ * At least one CODEC should match, otherwise we should have
+ * bailed out on a higher level, since there would be no
+ * CODEC to support the transfer direction in that case.
+ */
+ snd_soc_runtime_calc_hw(rtd, hw, substream->stream);
+
+ if (formats)
+ hw->formats &= formats;
}

static int soc_pcm_components_open(struct snd_pcm_substream *substream,
--
2.24.1
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