diff options
Diffstat (limited to 'sound/soc/sof/intel/hda-pcm.c')
| -rw-r--r-- | sound/soc/sof/intel/hda-pcm.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/sound/soc/sof/intel/hda-pcm.c b/sound/soc/sof/intel/hda-pcm.c index 18f07364d219..9fb8521b896b 100644 --- a/sound/soc/sof/intel/hda-pcm.c +++ b/sound/soc/sof/intel/hda-pcm.c @@ -3,7 +3,7 @@ // This file is provided under a dual BSD/GPLv2 license. When using or // redistributing this file, you may do so under either license. // -// Copyright(c) 2018 Intel Corporation. All rights reserved. +// Copyright(c) 2018 Intel Corporation // // Authors: Liam Girdwood <liam.r.girdwood@linux.intel.com> // Ranjani Sridharan <ranjani.sridharan@linux.intel.com> @@ -142,6 +142,7 @@ int hda_dsp_pcm_hw_params(struct snd_sof_dev *sdev, return 0; } +EXPORT_SYMBOL_NS(hda_dsp_pcm_hw_params, SND_SOC_SOF_INTEL_HDA_COMMON); /* update SPIB register with appl position */ int hda_dsp_pcm_ack(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream) @@ -164,6 +165,7 @@ int hda_dsp_pcm_ack(struct snd_sof_dev *sdev, struct snd_pcm_substream *substrea return 0; } +EXPORT_SYMBOL_NS(hda_dsp_pcm_ack, SND_SOC_SOF_INTEL_HDA_COMMON); int hda_dsp_pcm_trigger(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream, int cmd) @@ -173,6 +175,7 @@ int hda_dsp_pcm_trigger(struct snd_sof_dev *sdev, return hda_dsp_stream_trigger(sdev, hext_stream, cmd); } +EXPORT_SYMBOL_NS(hda_dsp_pcm_trigger, SND_SOC_SOF_INTEL_HDA_COMMON); snd_pcm_uframes_t hda_dsp_pcm_pointer(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream) @@ -204,6 +207,7 @@ found: trace_sof_intel_hda_dsp_pcm(sdev, hstream, substream, pos); return pos; } +EXPORT_SYMBOL_NS(hda_dsp_pcm_pointer, SND_SOC_SOF_INTEL_HDA_COMMON); int hda_dsp_pcm_open(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream) @@ -259,10 +263,40 @@ int hda_dsp_pcm_open(struct snd_sof_dev *sdev, snd_pcm_hw_constraint_mask64(substream->runtime, SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_FMTBIT_S16 | SNDRV_PCM_FMTBIT_S32); + /* + * The dsp_max_burst_size_in_ms is the length of the maximum burst size + * of the host DMA in the ALSA buffer. + * + * On playback start the DMA will transfer dsp_max_burst_size_in_ms + * amount of data in one initial burst to fill up the host DMA buffer. + * Consequent DMA burst sizes are shorter and their length can vary. + * To make sure that userspace allocate large enough ALSA buffer we need + * to place a constraint on the buffer time. + * + * On capture the DMA will transfer 1ms chunks. + * + * Exact dsp_max_burst_size_in_ms constraint is racy, so set the + * constraint to a minimum of 2x dsp_max_burst_size_in_ms. + */ + if (spcm->stream[direction].dsp_max_burst_size_in_ms) + snd_pcm_hw_constraint_minmax(substream->runtime, + SNDRV_PCM_HW_PARAM_BUFFER_TIME, + spcm->stream[direction].dsp_max_burst_size_in_ms * USEC_PER_MSEC * 2, + UINT_MAX); + /* binding pcm substream to hda stream */ substream->runtime->private_data = &dsp_stream->hstream; + + /* + * Reset the llp cache values (they are used for LLP compensation in + * case the counter is not reset) + */ + dsp_stream->pplcllpl = 0; + dsp_stream->pplcllpu = 0; + return 0; } +EXPORT_SYMBOL_NS(hda_dsp_pcm_open, SND_SOC_SOF_INTEL_HDA_COMMON); int hda_dsp_pcm_close(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream) @@ -282,3 +316,4 @@ int hda_dsp_pcm_close(struct snd_sof_dev *sdev, substream->runtime->private_data = NULL; return 0; } +EXPORT_SYMBOL_NS(hda_dsp_pcm_close, SND_SOC_SOF_INTEL_HDA_COMMON); |