forked from Minki/linux
9995c1d096
Commit 3aa1e96a2b ("ASoC: soc-pcm: fix BE handling of PAUSE_RELEASE")
did not modify the existing logic and kept the same logic for the following
transition
play FE1 -> BE state is START
pause FE1 -> BE state is PAUSED
play FE2 -> BE state is START
stop FE2 -> BE state is STOP <<< !!
release FE1 -> BE state is START
stop FE1 -> BE state is STOP
At the time it was identified by reviewers that a better solution
might consist in
play FE1 -> BE state is START
pause FE1 -> BE state is PAUSED
play FE2 -> BE state is START
stop FE2 -> BE state is PAUSE <<< !!
release FE1 -> BE state is START
stop FE1 -> BE state is STOP
This patch suggest a transition to PAUSE when all the 'active' streams
are paused. This would allow for a more consistent resource management
for platforms where PAUSE and STOP are handled differently.
To track the special case of an FE going from PAUSE_PUSH to STOP, we
add a state variable for each FE context. This 'fe_pause' boolean is
set on PAUSE_PUSH and cleared on either PAUSE_RELEASE and STOP
triggers.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20220406190056.233481-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
174 lines
5.5 KiB
C
174 lines
5.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* linux/sound/soc-dpcm.h -- ALSA SoC Dynamic PCM Support
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*
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* Author: Liam Girdwood <lrg@ti.com>
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*/
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#ifndef __LINUX_SND_SOC_DPCM_H
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#define __LINUX_SND_SOC_DPCM_H
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <sound/pcm.h>
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struct snd_soc_pcm_runtime;
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/*
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* Types of runtime_update to perform. e.g. originated from FE PCM ops
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* or audio route changes triggered by muxes/mixers.
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*/
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enum snd_soc_dpcm_update {
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SND_SOC_DPCM_UPDATE_NO = 0,
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SND_SOC_DPCM_UPDATE_BE,
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SND_SOC_DPCM_UPDATE_FE,
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};
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/*
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* Dynamic PCM Frontend -> Backend link management states.
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*/
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enum snd_soc_dpcm_link_state {
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SND_SOC_DPCM_LINK_STATE_NEW = 0, /* newly created link */
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SND_SOC_DPCM_LINK_STATE_FREE, /* link to be dismantled */
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};
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/*
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* Dynamic PCM Frontend -> Backend link PCM states.
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*/
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enum snd_soc_dpcm_state {
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SND_SOC_DPCM_STATE_NEW = 0,
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SND_SOC_DPCM_STATE_OPEN,
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SND_SOC_DPCM_STATE_HW_PARAMS,
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SND_SOC_DPCM_STATE_PREPARE,
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SND_SOC_DPCM_STATE_START,
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SND_SOC_DPCM_STATE_STOP,
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SND_SOC_DPCM_STATE_PAUSED,
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SND_SOC_DPCM_STATE_SUSPEND,
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SND_SOC_DPCM_STATE_HW_FREE,
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SND_SOC_DPCM_STATE_CLOSE,
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};
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/*
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* Dynamic PCM trigger ordering. Triggering flexibility is required as some
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* DSPs require triggering before/after their CPU platform and DAIs.
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*
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* i.e. some clients may want to manually order this call in their PCM
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* trigger() whilst others will just use the regular core ordering.
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*/
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enum snd_soc_dpcm_trigger {
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SND_SOC_DPCM_TRIGGER_PRE = 0,
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SND_SOC_DPCM_TRIGGER_POST,
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SND_SOC_DPCM_TRIGGER_BESPOKE,
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};
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/*
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* Dynamic PCM link
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* This links together a FE and BE DAI at runtime and stores the link
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* state information and the hw_params configuration.
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*/
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struct snd_soc_dpcm {
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/* FE and BE DAIs*/
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struct snd_soc_pcm_runtime *be;
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struct snd_soc_pcm_runtime *fe;
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/* link state */
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enum snd_soc_dpcm_link_state state;
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/* list of BE and FE for this DPCM link */
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struct list_head list_be;
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struct list_head list_fe;
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/* hw params for this link - may be different for each link */
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struct snd_pcm_hw_params hw_params;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *debugfs_state;
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#endif
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};
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/*
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* Dynamic PCM runtime data.
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*/
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struct snd_soc_dpcm_runtime {
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struct list_head be_clients;
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struct list_head fe_clients;
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int users;
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struct snd_pcm_runtime *runtime;
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struct snd_pcm_hw_params hw_params;
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/* state and update */
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enum snd_soc_dpcm_update runtime_update;
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enum snd_soc_dpcm_state state;
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int trigger_pending; /* trigger cmd + 1 if pending, 0 if not */
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int be_start; /* refcount protected by BE stream pcm lock */
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int be_pause; /* refcount protected by BE stream pcm lock */
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bool fe_pause; /* used to track STOP after PAUSE */
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};
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#define for_each_dpcm_fe(be, stream, _dpcm) \
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list_for_each_entry(_dpcm, &(be)->dpcm[stream].fe_clients, list_fe)
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#define for_each_dpcm_be(fe, stream, _dpcm) \
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list_for_each_entry(_dpcm, &(fe)->dpcm[stream].be_clients, list_be)
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#define for_each_dpcm_be_safe(fe, stream, _dpcm, __dpcm) \
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list_for_each_entry_safe(_dpcm, __dpcm, &(fe)->dpcm[stream].be_clients, list_be)
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#define for_each_dpcm_be_rollback(fe, stream, _dpcm) \
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list_for_each_entry_continue_reverse(_dpcm, &(fe)->dpcm[stream].be_clients, list_be)
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/* can this BE stop and free */
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int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
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struct snd_soc_pcm_runtime *be, int stream);
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/* can this BE perform a hw_params() */
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int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
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struct snd_soc_pcm_runtime *be, int stream);
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/* is the current PCM operation for this FE ? */
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int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream);
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/* is the current PCM operation for this BE ? */
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int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
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struct snd_soc_pcm_runtime *be, int stream);
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/* get the substream for this BE */
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struct snd_pcm_substream *
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snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream);
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/* update audio routing between PCMs and any DAI links */
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int snd_soc_dpcm_runtime_update(struct snd_soc_card *card);
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#ifdef CONFIG_DEBUG_FS
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void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd);
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#else
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static inline void soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd)
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{
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}
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#endif
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int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
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int stream, struct snd_soc_dapm_widget_list **list_);
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void dpcm_path_put(struct snd_soc_dapm_widget_list **list);
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int dpcm_process_paths(struct snd_soc_pcm_runtime *fe,
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int stream, struct snd_soc_dapm_widget_list **list, int new);
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int dpcm_be_dai_startup(struct snd_soc_pcm_runtime *fe, int stream);
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void dpcm_be_dai_stop(struct snd_soc_pcm_runtime *fe, int stream,
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int do_hw_free, struct snd_soc_dpcm *last);
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void dpcm_be_disconnect(struct snd_soc_pcm_runtime *fe, int stream);
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void dpcm_clear_pending_state(struct snd_soc_pcm_runtime *fe, int stream);
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void dpcm_be_dai_hw_free(struct snd_soc_pcm_runtime *fe, int stream);
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int dpcm_be_dai_hw_params(struct snd_soc_pcm_runtime *fe, int tream);
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int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream, int cmd);
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int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream);
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int dpcm_dapm_stream_event(struct snd_soc_pcm_runtime *fe, int dir,
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int event);
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bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget, enum snd_soc_dapm_direction dir);
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#define dpcm_be_dai_startup_rollback(fe, stream, last) \
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dpcm_be_dai_stop(fe, stream, 0, last)
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#define dpcm_be_dai_startup_unwind(fe, stream) dpcm_be_dai_stop(fe, stream, 0, NULL)
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#define dpcm_be_dai_shutdown(fe, stream) dpcm_be_dai_stop(fe, stream, 1, NULL)
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#endif
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