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@xxxxxxxxxxxx>
---
include/sound/soc.h | 3 +++
sound/soc/soc-pcm.c | 59 ++++++++++++++++++++++++++++++---------------
2 files changed, 42 insertions(+), 20 deletions(-)
diff --git a/include/sound/soc.h b/include/sound/soc.h
index 81e5d17be935..9543d9246ca4 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -471,6 +471,9 @@ 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 90857138c823..2ad501aaa4f9 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -587,11 +587,18 @@ 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 *cpu_dai;
struct snd_soc_pcm_stream *codec_stream;
@@ -602,7 +609,6 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
unsigned int cpu_rate_min = 0, cpu_rate_max = UINT_MAX;
unsigned int rates = UINT_MAX, cpu_rates = UINT_MAX;
u64 formats = ULLONG_MAX;
- int stream = substream->stream;
int i;
/* first calculate min/max only for CPUs in the DAI link */
@@ -613,12 +619,8 @@ 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 CPU should match, otherwise we should have
- * bailed out on a higher level, since there would be no
- * CPU to support the transfer direction in that case.
*/
- if (!snd_soc_dai_stream_valid(cpu_dai,
- substream->stream))
+ if (!snd_soc_dai_stream_valid(cpu_dai, stream))
continue;
cpu_stream = snd_soc_dai_get_pcm_stream(cpu_dai, stream);
@@ -640,12 +642,8 @@ 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_stream = snd_soc_dai_get_pcm_stream(codec_dai, stream);
@@ -658,6 +656,10 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
rates = snd_pcm_rate_mask_intersect(codec_stream->rates, rates);
}
+ /* Verify both a valid CPU DAI and a valid CODEC DAI were found */
+ if (!chan_min || !cpu_chan_min)
+ return -EINVAL;
+
/*
* chan min/max cannot be enforced if there are multiple CODEC DAIs
* connected to CPU DAI(s), use CPU DAI's directly and let
@@ -671,18 +673,35 @@ static void soc_pcm_init_runtime_hw(struct snd_pcm_substream *substream)
/* finally find a intersection between CODECs and CPUs */
hw->channels_min = max(chan_min, cpu_chan_min);
hw->channels_max = min(chan_max, cpu_chan_max);
- if (hw->formats)
- hw->formats &= formats;
- else
- hw->formats = formats;
+ hw->formats = formats;
hw->rates = snd_pcm_rate_mask_intersect(rates, cpu_rates);
- snd_pcm_limit_hw_rates(runtime);
+ snd_pcm_hw_limit_rates(hw);
hw->rate_min = max(hw->rate_min, cpu_rate_min);
hw->rate_min = max(hw->rate_min, rate_min);
hw->rate_max = min_not_zero(hw->rate_max, cpu_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 CPU and one CODEC should match. Otherwise, we should
+ * have bailed out on a higher level, since there would be no CPU or
+ * 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
