diff options
| author |   Kai Vehmanen <kai.vehmanen@linux.intel.com> | 2020-11-18 16:05:45 +0200 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2020-11-19 13:00:04 +0000 |
| commit | caebea04b9125c677e6e747793fbc7fab077727b (patch) | |
| tree | ebc7b8f65bbbc784df3aee16e3ad26e57a34c92d /sound/soc/sof | |
| parent | ASoC: SOF: relax PCM period and buffer size constraints (diff) | |
| download | linux-dev-caebea04b9125c677e6e747793fbc7fab077727b.tar.xz linux-dev-caebea04b9125c677e6e747793fbc7fab077727b.zip | |
ASoC: SOF: Intel: add hw specific PCM constraints
Part of PCM constraints are set based on DSP topology, but rest
should be set based on hardware capabilities. Add PCM constraints
for Intel platforms:
- Add constraint for the period count to be integer. This avoids
wrap-arounds of the DMA circular buffer in middle of a period.
- Align period size to dword/32bit as per HDA spec.
Both constraints are aligned with current implementation in snd-hda-intel
driver.
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20201118140545.2138895-2-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/sof')
| -rw-r--r-- | sound/soc/sof/intel/hda-pcm.c | 7 | ||||
| -rw-r--r-- | sound/soc/sof/intel/intel-ipc.c | 7 |
2 files changed, 14 insertions, 0 deletions
diff --git a/sound/soc/sof/intel/hda-pcm.c b/sound/soc/sof/intel/hda-pcm.c index b527d5958ae5..5d35bb18660a 100644 --- a/sound/soc/sof/intel/hda-pcm.c +++ b/sound/soc/sof/intel/hda-pcm.c @@ -225,6 +225,13 @@ int hda_dsp_pcm_open(struct snd_sof_dev *sdev, return -ENODEV; } + /* minimum as per HDA spec */ + snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4); + + /* avoid circular buffer wrap in middle of period */ + snd_pcm_hw_constraint_integer(substream->runtime, + SNDRV_PCM_HW_PARAM_PERIODS); + /* binding pcm substream to hda stream */ substream->runtime->private_data = &dsp_stream->hstream; return 0; diff --git a/sound/soc/sof/intel/intel-ipc.c b/sound/soc/sof/intel/intel-ipc.c index 310f9168c124..de66f8a82a07 100644 --- a/sound/soc/sof/intel/intel-ipc.c +++ b/sound/soc/sof/intel/intel-ipc.c @@ -73,6 +73,13 @@ int intel_pcm_open(struct snd_sof_dev *sdev, /* binding pcm substream to hda stream */ substream->runtime->private_data = stream; + /* align to DMA minimum transfer size */ + snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4); + + /* avoid circular buffer wrap in middle of period */ + snd_pcm_hw_constraint_integer(substream->runtime, + SNDRV_PCM_HW_PARAM_PERIODS); + return 0; } EXPORT_SYMBOL_NS(intel_pcm_open, SND_SOC_SOF_INTEL_HIFI_EP_IPC); |