// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) // // 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) 2022 Intel Corporation //
/** * struct sof_ipc4_timestamp_info - IPC4 timestamp info * @host_copier: the host copier of the pcm stream * @dai_copier: the dai copier of the pcm stream * @stream_start_offset: reported by fw in memory window (converted to * frames at host_copier sampling rate) * @stream_end_offset: reported by fw in memory window (converted to * frames at host_copier sampling rate) * @llp_offset: llp offset in memory window * @delay: Calculated and stored in pointer callback. The stored value is * returned in the delay callback. Expressed in frames at host copier * sampling rate.
*/ struct sof_ipc4_timestamp_info { struct sof_ipc4_copier *host_copier; struct sof_ipc4_copier *dai_copier;
u64 stream_start_offset;
u64 stream_end_offset;
u32 llp_offset;
snd_pcm_sframes_t delay;
};
/** * struct sof_ipc4_pcm_stream_priv - IPC4 specific private data * @time_info: pointer to time info struct if it is supported, otherwise NULL * @chain_dma_allocated: indicates the ChainDMA allocation state
*/ struct sof_ipc4_pcm_stream_priv { struct sof_ipc4_timestamp_info *time_info;
bool chain_dma_allocated;
};
/* * Modulus to use to compare host and link position counters. The sampling * rates may be different, so the raw hardware counters will wrap * around at different times. To calculate differences, use * DELAY_BOUNDARY as a common modulus. This value must be smaller than * the wrap-around point of any hardware counter, and larger than any * valid delay measurement.
*/ #define DELAY_BOUNDARY U32_MAX
/* trigger multiple pipelines with a single IPC */
msg.extension = SOF_IPC4_GLB_PIPE_STATE_EXT_MULTI;
/* ipc_size includes the count and the pipeline IDs for the number of pipelines */
ipc_size = sizeof(u32) * (trigger_list->count + 1);
msg.data_size = ipc_size;
msg.data_ptr = trigger_list;
staticvoid sof_ipc4_add_pipeline_by_priority(struct ipc4_pipeline_set_state_data *trigger_list, struct snd_sof_widget *pipe_widget,
s8 *pipe_priority, bool ascend)
{ struct sof_ipc4_pipeline *pipeline = pipe_widget->private; int i, j;
for (i = 0; i < trigger_list->count; i++) { /* add pipeline from low priority to high */ if (ascend && pipeline->priority < pipe_priority[i]) break; /* add pipeline from high priority to low */ elseif (!ascend && pipeline->priority > pipe_priority[i]) break;
}
if (pipeline->skip_during_fe_trigger && state != SOF_IPC4_PIPE_RESET) return;
switch (state) { case SOF_IPC4_PIPE_RUNNING: /* * Trigger pipeline if all PCMs containing it are paused or if it is RUNNING * for the first time
*/ if (spipe->started_count == spipe->paused_count)
sof_ipc4_add_pipeline_by_priority(trigger_list, pipe_widget, pipe_priority, false); break; case SOF_IPC4_PIPE_RESET: /* RESET if the pipeline is neither running nor paused */ if (!spipe->started_count && !spipe->paused_count)
sof_ipc4_add_pipeline_by_priority(trigger_list, pipe_widget, pipe_priority, true); break; case SOF_IPC4_PIPE_PAUSED: /* Pause the pipeline only when its started_count is 1 more than paused_count */ if (spipe->paused_count == (spipe->started_count - 1))
sof_ipc4_add_pipeline_by_priority(trigger_list, pipe_widget, pipe_priority, true); break; default: break;
}
}
staticvoid
sof_ipc4_update_pipeline_state(struct snd_sof_dev *sdev, int state, int cmd, struct snd_sof_pipeline *spipe, struct ipc4_pipeline_set_state_data *trigger_list)
{ struct snd_sof_widget *pipe_widget = spipe->pipe_widget; struct sof_ipc4_pipeline *pipeline = pipe_widget->private; int i;
if (pipeline->skip_during_fe_trigger && state != SOF_IPC4_PIPE_RESET) return;
/* set state for pipeline if it was just triggered */ for (i = 0; i < trigger_list->count; i++) { if (trigger_list->pipeline_instance_ids[i] == pipe_widget->instance_id) {
pipeline->state = state; break;
}
}
switch (state) { case SOF_IPC4_PIPE_PAUSED: switch (cmd) { case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* * increment paused_count if the PAUSED is the final state during * the PAUSE trigger
*/
spipe->paused_count++; break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: /* * decrement started_count if PAUSED is the final state during the * STOP trigger
*/
spipe->started_count--; break; default: break;
} break; case SOF_IPC4_PIPE_RUNNING: switch (cmd) { case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* decrement paused_count for RELEASE */
spipe->paused_count--; break; case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: /* increment started_count for START/RESUME */
spipe->started_count++; break; default: break;
} break; default: break;
}
}
/* * The picture below represents the pipeline state machine wrt PCM actions corresponding to the * triggers and ioctls * +---------------+ * | | * | INIT | * | | * +-------+-------+ * | * | * | START * | * | * +----------------+ +------v-------+ +-------------+ * | | START | | HW_FREE | | * | RUNNING <-------------+ PAUSED +--------------> + RESET | * | | PAUSE | | | | * +------+---------+ RELEASE +---------+----+ +-------------+ * | ^ * | | * | | * | | * | PAUSE | * +---------------------------------+ * STOP/SUSPEND * * Note that during system suspend, the suspend trigger is followed by a hw_free in * sof_pcm_trigger(). So, the final state during suspend would be RESET. * Also, since the SOF driver doesn't support full resume, streams would be restarted with the * prepare ioctl before the START trigger.
*/
/* * Chained DMA is a special case where there is no processing on * DSP. The samples are just moved over by host side DMA to a single * buffer on DSP and directly from there to link DMA. However, the * model on SOF driver has two notional pipelines, one at host DAI, * and another at link DAI. They both shall have the use_chain_dma * attribute.
*/
staticint sof_ipc4_chain_dma_trigger(struct snd_sof_dev *sdev, struct snd_sof_pcm *spcm, int direction, struct snd_sof_pcm_stream_pipeline_list *pipeline_list, int state, int cmd)
{ struct sof_ipc4_fw_data *ipc4_data = sdev->private; struct sof_ipc4_pcm_stream_priv *stream_priv; bool allocate, enable, set_fifo_size; struct sof_ipc4_msg msg = {{ 0 }}; int ret, i;
stream_priv = spcm->stream[direction].private;
switch (state) { case SOF_IPC4_PIPE_RUNNING: /* Allocate and start chained dma */
allocate = true;
enable = true; /* * SOF assumes creation of a new stream from the presence of fifo_size * in the message, so we must leave it out in pause release case.
*/ if (cmd == SNDRV_PCM_TRIGGER_PAUSE_RELEASE)
set_fifo_size = false; else
set_fifo_size = true; break; case SOF_IPC4_PIPE_PAUSED: /* Disable chained DMA. */
allocate = true;
enable = false;
set_fifo_size = false; break; case SOF_IPC4_PIPE_RESET: /* Disable and free chained DMA. */
/* ChainDMA can only be reset if it has been allocated */ if (!stream_priv->chain_dma_allocated) return 0;
/* * To set-up the DMA chain, the host DMA ID and SCS setting * are retrieved from the host pipeline configuration. Likewise * the link DMA ID and fifo_size are retrieved from the link * pipeline configuration.
*/ for (i = 0; i < pipeline_list->count; i++) { struct snd_sof_pipeline *spipe = pipeline_list->pipelines[i]; struct snd_sof_widget *pipe_widget = spipe->pipe_widget; struct sof_ipc4_pipeline *pipeline = pipe_widget->private;
if (!pipeline->use_chain_dma) {
spcm_err(spcm, direction, "All pipelines in chained DMA path should have use_chain_dma attribute set."); return -EINVAL;
}
msg.primary |= pipeline->msg.primary;
/* Add fifo_size (actually DMA buffer size) field to the message */ if (set_fifo_size)
msg.extension |= pipeline->msg.extension;
}
if (direction == SNDRV_PCM_STREAM_CAPTURE) { /* * For ChainDMA the DMA ids are unique with the following mapping: * playback: 0 - (num_playback_streams - 1) * capture: num_playback_streams - (num_playback_streams + * num_capture_streams - 1) * * Add the num_playback_streams offset to the DMA ids stored in * msg.primary in case capture
*/
msg.primary += SOF_IPC4_GLB_CHAIN_DMA_HOST_ID(ipc4_data->num_playback_streams);
msg.primary += SOF_IPC4_GLB_CHAIN_DMA_LINK_ID(ipc4_data->num_playback_streams);
}
if (allocate)
msg.primary |= SOF_IPC4_GLB_CHAIN_DMA_ALLOCATE_MASK;
if (enable)
msg.primary |= SOF_IPC4_GLB_CHAIN_DMA_ENABLE_MASK;
ret = sof_ipc_tx_message_no_reply(sdev->ipc, &msg, 0); /* Update the ChainDMA allocation state */ if (!ret)
stream_priv->chain_dma_allocated = allocate;
/* * If use_chain_dma attribute is set we proceed to chained DMA * trigger function that handles the rest for the substream.
*/ if (pipeline->use_chain_dma) { struct sof_ipc4_timestamp_info *time_info;
ret = sof_ipc4_chain_dma_trigger(sdev, spcm, substream->stream,
pipeline_list, state, cmd); if (ret || !time_info) return ret;
if (state == SOF_IPC4_PIPE_PAUSED) { /* * Record the DAI position for delay reporting * To handle multiple pause/resume/xrun we need to add * the positions to simulate how the firmware behaves
*/
u64 pos = snd_sof_pcm_get_dai_frame_counter(sdev, component,
substream);
time_info->stream_end_offset += pos;
} elseif (state == SOF_IPC4_PIPE_RESET) { /* Reset the end offset as the stream is stopped */
time_info->stream_end_offset = 0;
}
return 0;
}
/* allocate memory for the pipeline data */
trigger_list = kzalloc(struct_size(trigger_list, pipeline_instance_ids,
pipeline_list->count), GFP_KERNEL); if (!trigger_list) return -ENOMEM;
/* * IPC4 requires pipelines to be triggered in order starting at the sink and * walking all the way to the source. So traverse the pipeline_list in the order * sink->source when starting PCM's and in the reverse order to pause/stop PCM's. * Skip the pipelines that have their skip_during_fe_trigger flag set. If there is a fork * in the pipeline, the order of triggering between the left/right paths will be * indeterministic. But the sink->source trigger order sink->source would still be * guaranteed for each fork independently.
*/ if (state == SOF_IPC4_PIPE_RUNNING || state == SOF_IPC4_PIPE_RESET) for (i = pipeline_list->count - 1; i >= 0; i--) {
spipe = pipeline_list->pipelines[i];
sof_ipc4_add_pipeline_to_trigger_list(sdev, state, spipe, trigger_list,
pipe_priority);
} else for (i = 0; i < pipeline_list->count; i++) {
spipe = pipeline_list->pipelines[i];
sof_ipc4_add_pipeline_to_trigger_list(sdev, state, spipe, trigger_list,
pipe_priority);
}
/* return if all pipelines are in the requested state already */ if (!trigger_list->count) {
ret = 0; goto free;
}
/* no need to pause before reset or before pause release */ if (state == SOF_IPC4_PIPE_RESET || cmd == SNDRV_PCM_TRIGGER_PAUSE_RELEASE) goto skip_pause_transition;
/* * set paused state for pipelines if the final state is PAUSED or when the pipeline * is set to RUNNING for the first time after the PCM is started.
*/
ret = sof_ipc4_set_multi_pipeline_state(sdev, SOF_IPC4_PIPE_PAUSED, trigger_list); if (ret < 0) {
spcm_err(spcm, substream->stream, "failed to pause all pipelines\n"); goto free;
}
/* update PAUSED state for all pipelines just triggered */ for (i = 0; i < pipeline_list->count ; i++) {
spipe = pipeline_list->pipelines[i];
sof_ipc4_update_pipeline_state(sdev, SOF_IPC4_PIPE_PAUSED, cmd, spipe,
trigger_list);
}
/* return if this is the final state */ if (state == SOF_IPC4_PIPE_PAUSED) { struct sof_ipc4_timestamp_info *time_info;
/* * Invalidate the stream_start_offset to make sure that it is * going to be updated if the stream resumes
*/
time_info = sof_ipc4_sps_to_time_info(&spcm->stream[substream->stream]); if (time_info)
time_info->stream_start_offset = SOF_IPC4_INVALID_STREAM_POSITION;
goto free;
}
skip_pause_transition: /* else set the RUNNING/RESET state in the DSP */
ret = sof_ipc4_set_multi_pipeline_state(sdev, state, trigger_list); if (ret < 0) {
spcm_err(spcm, substream->stream, "failed to set final state %d for all pipelines\n",
state); /* * workaround: if the firmware is crashed while setting the * pipelines to reset state we must ignore the error code and * reset it to 0. * Since the firmware is crashed we will not send IPC messages * and we are going to see errors printed, but the state of the * widgets will be correct for the next boot.
*/ if (sdev->fw_state != SOF_FW_CRASHED || state != SOF_IPC4_PIPE_RESET) goto free;
ret = 0;
}
/* update RUNNING/RESET state for all pipelines that were just triggered */ for (i = 0; i < pipeline_list->count; i++) {
spipe = pipeline_list->pipelines[i];
sof_ipc4_update_pipeline_state(sdev, state, cmd, spipe, trigger_list);
}
staticint sof_ipc4_pcm_trigger(struct snd_soc_component *component, struct snd_pcm_substream *substream, int cmd)
{ int state;
/* determine the pipeline state */ switch (cmd) { case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_START:
state = SOF_IPC4_PIPE_RUNNING; break; case SNDRV_PCM_TRIGGER_PAUSE_PUSH: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_STOP:
state = SOF_IPC4_PIPE_PAUSED; break; default:
dev_err(component->dev, "%s: unhandled trigger cmd %d\n", __func__, cmd); return -EINVAL;
}
/* set the pipeline state */ return sof_ipc4_trigger_pipelines(component, substream, state, cmd);
}
staticint sof_ipc4_pcm_hw_free(struct snd_soc_component *component, struct snd_pcm_substream *substream)
{ /* command is not relevant with RESET, so just pass 0 */ return sof_ipc4_trigger_pipelines(component, substream, SOF_IPC4_PIPE_RESET, 0);
}
/* * Find the first best matching hardware config: * rate + format + channels are matching * rate + channel are matching * * The copier cannot do rate and/or channel conversion.
*/ for (i = 0; i < slink->num_hw_configs; i++) { struct snd_soc_tplg_hw_config *hw_config = &slink->hw_configs[i];
if (params_rate(params) == le32_to_cpu(hw_config->fsync_rate) &&
params_width(params) == le32_to_cpu(hw_config->tdm_slot_width) &&
params_channels(params) <= le32_to_cpu(hw_config->tdm_slots)) {
current_config = le32_to_cpu(hw_config->id);
partial_match = false; /* best match found */ break;
} elseif (current_config < 0 &&
params_rate(params) == le32_to_cpu(hw_config->fsync_rate) &&
params_channels(params) <= le32_to_cpu(hw_config->tdm_slots)) {
current_config = le32_to_cpu(hw_config->id);
partial_match = true; /* keep looking for better match */
}
}
if (current_config < 0) {
dev_err(sdev->dev, "%s: No suitable hw_config found for %s (num_hw_configs: %d)\n",
__func__, slink->link->name, slink->num_hw_configs); return -EINVAL;
}
dev_dbg(sdev->dev, "hw_config for %s: %d (num_hw_configs: %d) with %s match\n",
slink->link->name, current_config, slink->num_hw_configs,
partial_match ? "partial" : "full");
list_for_each_entry(dai, &sdev->dai_list, list) if (!strcmp(slink->link->name, dai->name))
dai->current_config = current_config;
return 0;
}
/* * Fixup DAI link parameters for sampling rate based on * DAI copier configuration.
*/ staticint sof_ipc4_pcm_dai_link_fixup_rate(struct snd_sof_dev *sdev, struct snd_pcm_hw_params *params, struct sof_ipc4_copier *ipc4_copier)
{ struct sof_ipc4_pin_format *pin_fmts = ipc4_copier->available_fmt.input_pin_fmts; struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); int num_input_formats = ipc4_copier->available_fmt.num_input_formats; unsignedint fe_rate = params_rate(params); bool fe_be_rate_match = false; bool single_be_rate = true; unsignedint be_rate; int i;
if (WARN_ON_ONCE(!num_input_formats)) return -EINVAL;
/* * Copier does not change sampling rate, so we * need to only consider the input pin information.
*/
be_rate = pin_fmts[0].audio_fmt.sampling_frequency; for (i = 0; i < num_input_formats; i++) { unsignedint val = pin_fmts[i].audio_fmt.sampling_frequency;
/* * If rate is different than FE rate, topology must * contain an SRC. But we do require topology to * define a single rate in the DAI copier config in * this case (FE rate may be variable).
*/ if (!fe_be_rate_match) { if (!single_be_rate) {
dev_err(sdev->dev, "Unable to select sampling rate for DAI link\n"); return -EINVAL;
}
if (WARN_ON_ONCE(!num_input_formats)) return -EINVAL;
/* * Copier does not change channels, so we * need to only consider the input pin information.
*/
be_channels = SOF_IPC4_AUDIO_FORMAT_CFG_CHANNELS_COUNT(pin_fmts[0].audio_fmt.fmt_cfg); for (i = 0; i < num_input_formats; i++) {
val = SOF_IPC4_AUDIO_FORMAT_CFG_CHANNELS_COUNT(pin_fmts[i].audio_fmt.fmt_cfg);
if (val != be_channels)
single_be_channels = false;
/* * If channels is different than FE channels, topology must contain a * module which can change the number of channels. But we do require * topology to define a single channels in the DAI copier config in * this case (FE channels may be variable).
*/ if (!fe_be_match) { if (!single_be_channels) {
dev_err(sdev->dev, "Unable to select channels for DAI link\n"); return -EINVAL;
}
if (!dai) {
dev_err(component->dev, "%s: No DAI found with name %s\n", __func__,
rtd->dai_link->name); return -EINVAL;
}
ipc4_copier = dai->private; if (!ipc4_copier) {
dev_err(component->dev, "%s: No private data found for DAI %s\n",
__func__, rtd->dai_link->name); return -EINVAL;
}
ret = sof_ipc4_pcm_dai_link_fixup_rate(sdev, params, ipc4_copier); if (ret) return ret;
ret = sof_ipc4_pcm_dai_link_fixup_channels(sdev, params, ipc4_copier); if (ret) return ret;
if (single_bitdepth) {
snd_mask_none(fmt);
valid_bits = SOF_IPC4_AUDIO_FORMAT_CFG_V_BIT_DEPTH(ipc4_fmt->fmt_cfg);
dev_dbg(component->dev, "Set %s to %d bit format\n", dai->name, valid_bits);
}
/* Set format if it is specified */ switch (valid_bits) { case 16:
snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE); break; case 24:
snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S24_LE); break; case 32:
snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S32_LE); break; default: break;
}
if (ipc4_copier->dai_type == SOF_DAI_INTEL_SSP) return ipc4_ssp_dai_config_pcm_params_match(sdev,
(char *)rtd->dai_link->name,
params);
if (abi_version < SOF_IPC4_FW_REGS_ABI_VER)
support_info = false;
/* For delay reporting the get_host_byte_counter callback is needed */ if (!sof_ops(sdev) || !sof_ops(sdev)->get_host_byte_counter)
support_info = false;
/* allocate memory for max number of pipeline IDs */
pipeline_list->pipelines = kcalloc(ipc4_data->max_num_pipelines, sizeof(*pipeline_list->pipelines),
GFP_KERNEL); if (!pipeline_list->pipelines) {
sof_ipc4_pcm_free(sdev, spcm); return -ENOMEM;
}
/* find host & dai to locate info in memory window */
for_each_dapm_widgets(sps->list, i, widget) { struct snd_sof_widget *swidget = widget->dobj.private;
if (!swidget) continue;
if (WIDGET_IS_AIF(swidget->widget->id)) {
host_copier = swidget->private;
} elseif (WIDGET_IS_DAI(swidget->widget->id)) {
dai = swidget->private;
dai_copier = dai->private;
}
}
/* both host and dai copier must be valid for time_info */ if (!host_copier || !dai_copier) {
dev_err(sdev->dev, "host or dai copier are not found\n"); return;
}
/* find llp slot used by current dai */ for (i = 0; i < SOF_IPC4_MAX_LLP_GPDMA_READING_SLOTS; i++) {
sof_mailbox_read(sdev, time_info->llp_offset, &llp_slot, sizeof(llp_slot)); if (llp_slot.node_id == dai_copier->data.gtw_cfg.node_id) break;
time_info->llp_offset += sizeof(llp_slot);
}
if (i < SOF_IPC4_MAX_LLP_GPDMA_READING_SLOTS) return;
/* if no llp gpdma slot is used, check aggregated sdw slot */
time_info->llp_offset = offsetof(struct sof_ipc4_fw_registers,
llp_sndw_reading_slots) + sdev->fw_info_box.offset; for (i = 0; i < SOF_IPC4_MAX_LLP_SNDW_READING_SLOTS; i++) {
sof_mailbox_read(sdev, time_info->llp_offset, &llp_slot, sizeof(llp_slot)); if (llp_slot.node_id == dai_copier->data.gtw_cfg.node_id) break;
time_info->llp_offset += sizeof(llp_slot);
}
if (i < SOF_IPC4_MAX_LLP_SNDW_READING_SLOTS) return;
spcm = snd_sof_find_spcm_dai(component, rtd); if (!spcm) return -EINVAL;
time_info = sof_ipc4_sps_to_time_info(&spcm->stream[substream->stream]); /* delay calculation is not supported by current fw_reg ABI */ if (!time_info) return 0;
if (!time_info->dai_copier || !time_info->host_copier) return value;
/* * copiers do not change sampling rate, so we can use the * out_format independently of stream direction
*/
dai_rate = time_info->dai_copier->data.out_format.sampling_frequency;
host_rate = time_info->host_copier->data.out_format.sampling_frequency;
if (!dai_rate || !host_rate || dai_rate == host_rate) return value;
/* take care not to overflow u64, rates can be up to 768000 */ if (value > U32_MAX) {
value = div64_u64(value, dai_rate);
value *= host_rate;
} else {
value *= host_rate;
value = div64_u64(value, dai_rate);
}
if (host_copier->data.gtw_cfg.node_id == SOF_IPC4_INVALID_NODE_ID) { return -EINVAL;
} elseif (host_copier->data.gtw_cfg.node_id == SOF_IPC4_CHAIN_DMA_NODE_ID) { /* * While the firmware does not support time_info reporting for * streams using ChainDMA, it is granted that ChainDMA can only * be used on Host+Link pairs where the link position is * accessible from the host side. * * Enable delay calculation in case of ChainDMA via host * accessible registers. * * The ChainDMA prefills the link DMA with a preamble * of zero samples. Set the stream start offset based * on size of the preamble (driver provided fifo size * multiplied by 2.5). We add 1ms of margin as the FW * will align the buffer size to DMA hardware * alignment that is not known to host.
*/ int pre_ms = SOF_IPC4_CHAIN_DMA_BUF_SIZE_MS * 5 / 2 + 1;
spcm = snd_sof_find_spcm_dai(component, rtd); if (!spcm) return -EOPNOTSUPP;
sps = &spcm->stream[substream->stream];
time_info = sof_ipc4_sps_to_time_info(sps); if (!time_info) return -EOPNOTSUPP;
/* * stream_start_offset is updated to memory window by FW based on * pipeline statistics and it may be invalid if host query happens before * the statistics is complete. And it will not change after the first initiailization.
*/ if (time_info->stream_start_offset == SOF_IPC4_INVALID_STREAM_POSITION) {
ret = sof_ipc4_get_stream_start_offset(sdev, substream, sps, time_info); if (ret < 0) return -EOPNOTSUPP;
}
/* For delay calculation we need the host counter */
host_cnt = snd_sof_pcm_get_host_byte_counter(sdev, component, substream);
/* Store the original value to host_ptr */
host_ptr = host_cnt;
/* convert the host_cnt to frames */
host_cnt = div64_u64(host_cnt, frames_to_bytes(substream->runtime, 1));
/* * If the LLP counter is not reported by firmware in the SRAM window * then read the dai (link) counter via host accessible means if * available.
*/ if (!time_info->llp_offset) {
dai_cnt = snd_sof_pcm_get_dai_frame_counter(sdev, component, substream); if (!dai_cnt) return -EOPNOTSUPP;
} else {
sof_mailbox_read(sdev, time_info->llp_offset, &llp, sizeof(llp));
dai_cnt = ((u64)llp.reading.llp_u << 32) | llp.reading.llp_l;
}
/* In two cases dai dma counter is not accurate * (1) dai pipeline is started before host pipeline * (2) multiple streams mixed into one. Each stream has the same dai dma * counter * * Firmware calculates correct stream_start_offset for all cases * including above two. * Driver subtracts stream_start_offset from dai dma counter to get * accurate one
*/
/* * On stream start the dai counter might not yet have reached the * stream_start_offset value which means that no frames have left the * DSP yet from the audio stream (on playback, capture streams have * offset of 0 as we start capturing right away). * In this case we need to adjust the distance between the counters by * increasing the host counter by (offset - dai_counter). * Otherwise the dai_counter needs to be adjusted to reflect the number * of valid frames passed on the DAI side. * * The delay is the difference between the counters on the two * sides of the DSP.
*/ if (dai_cnt < time_info->stream_start_offset) {
host_cnt += time_info->stream_start_offset - dai_cnt;
dai_cnt = 0;
} else {
dai_cnt -= time_info->stream_start_offset;
}
/* Convert to a common base before comparisons */
dai_cnt &= DELAY_BOUNDARY;
host_cnt &= DELAY_BOUNDARY;
/* * Convert the host byte counter to PCM pointer which wraps in buffer * and it is in frames
*/
div64_u64_rem(host_ptr, snd_pcm_lib_buffer_bytes(substream), &host_ptr);
*pointer = bytes_to_frames(substream->runtime, host_ptr);
spcm = snd_sof_find_spcm_dai(component, rtd); if (!spcm) return 0;
time_info = sof_ipc4_sps_to_time_info(&spcm->stream[substream->stream]); /* * Report the stored delay value calculated in the pointer callback. * In the unlikely event that the calculation was skipped/aborted, the * default 0 delay returned.
*/ if (time_info) return time_info->delay;
/* No delay information available, report 0 as delay */ return 0;
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