Quelle hda-pcm.c
Sprache: C
// 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) 2018 Intel Corporation
//
// Authors: Liam Girdwood <liam.r.girdwood@linux.intel.com>
// Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
// Rander Wang <rander.wang@intel.com>
// Keyon Jie <yang.jie@linux.intel.com>
//
/*
* Hardware interface for generic Intel audio DSP HDA IP
*/
#include <linux/moduleparam.h>
#include <sound/hda_register.h>
#include <sound/pcm_params.h>
#include <trace/events/sof_intel.h>
#include "../sof-audio.h"
#include "../ops.h"
#include "hda.h"
#define SDnFMT_BASE(x) ((x) << 14 )
#define SDnFMT_MULT(x) (((x) - 1 ) << 11 )
#define SDnFMT_DIV(x) (((x) - 1 ) << 8 )
#define SDnFMT_BITS(x) ((x) << 4 )
#define SDnFMT_CHAN(x) ((x) << 0 )
#define HDA_MAX_PERIOD_TIME_HEADROOM 10
static bool hda_always_enable_dmi_l1;
module_param_named(always_enable_dmi_l1, hda_always_enable_dmi_l1, bool , 0444 );
MODULE_PARM_DESC(always_enable_dmi_l1, "SOF HDA always enable DMI l1" );
static bool hda_disable_rewinds;
module_param_named(disable_rewinds, hda_disable_rewinds, bool , 0444 );
MODULE_PARM_DESC(disable_rewinds, "SOF HDA disable rewinds" );
static int hda_force_pause_support = -1 ;
module_param_named(force_pause_support, hda_force_pause_support, int , 0444 );
MODULE_PARM_DESC(force_pause_support,
"Pause support: -1: Use default, 0: Disable, 1: Enable (default -1)" );
u32 hda_dsp_get_mult_div(struct snd_sof_dev *sdev, int rate)
{
switch (rate) {
case 8000 :
return SDnFMT_DIV(6 );
case 9600 :
return SDnFMT_DIV(5 );
case 11025 :
return SDnFMT_BASE(1 ) | SDnFMT_DIV(4 );
case 16000 :
return SDnFMT_DIV(3 );
case 22050 :
return SDnFMT_BASE(1 ) | SDnFMT_DIV(2 );
case 32000 :
return SDnFMT_DIV(3 ) | SDnFMT_MULT(2 );
case 44100 :
return SDnFMT_BASE(1 );
case 48000 :
return 0 ;
case 88200 :
return SDnFMT_BASE(1 ) | SDnFMT_MULT(2 );
case 96000 :
return SDnFMT_MULT(2 );
case 176400 :
return SDnFMT_BASE(1 ) | SDnFMT_MULT(4 );
case 192000 :
return SDnFMT_MULT(4 );
default :
dev_warn(sdev->dev, "can't find div rate %d using 48kHz\n" ,
rate);
return 0 ; /* use 48KHz if not found */
}
};
u32 hda_dsp_get_bits(struct snd_sof_dev *sdev, int sample_bits)
{
switch (sample_bits) {
case 8 :
return SDnFMT_BITS(0 );
case 16 :
return SDnFMT_BITS(1 );
case 20 :
return SDnFMT_BITS(2 );
case 24 :
return SDnFMT_BITS(3 );
case 32 :
return SDnFMT_BITS(4 );
default :
dev_warn(sdev->dev, "can't find %d bits using 16bit\n" ,
sample_bits);
return SDnFMT_BITS(1 ); /* use 16bits format if not found */
}
};
int hda_dsp_pcm_hw_params(struct snd_sof_dev *sdev,
struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_sof_platform_stream_params *platform_params)
{
struct hdac_stream *hstream = substream->runtime->private_data;
struct hdac_ext_stream *hext_stream = stream_to_hdac_ext_stream(hstream);
struct sof_intel_hda_dev *hda = sdev->pdata->hw_pdata;
struct snd_dma_buffer *dmab;
int ret;
hstream->substream = substream;
dmab = substream->runtime->dma_buffer_p;
/*
* Use the codec required format val ( which is link_bps adjusted ) when
* the DSP is not in use
*/
if (!sdev->dspless_mode_selected) {
u32 rate = hda_dsp_get_mult_div(sdev, params_rate(params));
u32 bits = hda_dsp_get_bits(sdev, params_width(params));
hstream->format_val = rate | bits | (params_channels(params) - 1 );
}
hstream->bufsize = params_buffer_bytes(params);
hstream->period_bytes = params_period_bytes(params);
hstream->no_period_wakeup =
(params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
(params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
ret = hda_dsp_stream_hw_params(sdev, hext_stream, dmab, params);
if (ret < 0 ) {
dev_err(sdev->dev, "error: hdac prepare failed: %d\n" , ret);
return ret;
}
/* enable SPIB when rewinds are disabled */
if (hda_disable_rewinds)
hda_dsp_stream_spib_config(sdev, hext_stream, HDA_DSP_SPIB_ENABLE, 0 );
else
hda_dsp_stream_spib_config(sdev, hext_stream, HDA_DSP_SPIB_DISABLE, 0 );
if (hda)
platform_params->no_ipc_position = hda->no_ipc_position;
platform_params->stream_tag = hstream->stream_tag;
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)
{
struct hdac_stream *hstream = substream->runtime->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
ssize_t appl_pos, buf_size;
u32 spib;
appl_pos = frames_to_bytes(runtime, runtime->control->appl_ptr);
buf_size = frames_to_bytes(runtime, runtime->buffer_size);
spib = appl_pos % buf_size;
/* Allowable value for SPIB is 1 byte to max buffer size */
if (!spib)
spib = buf_size;
sof_io_write(sdev, hstream->spib_addr, spib);
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)
{
struct hdac_stream *hstream = substream->runtime->private_data;
struct hdac_ext_stream *hext_stream = stream_to_hdac_ext_stream(hstream);
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)
{
struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
struct snd_soc_component *scomp = sdev->component;
struct hdac_stream *hstream = substream->runtime->private_data;
struct sof_intel_hda_dev *hda = sdev->pdata->hw_pdata;
struct snd_sof_pcm *spcm;
snd_pcm_uframes_t pos;
spcm = snd_sof_find_spcm_dai(scomp, rtd);
if (!spcm) {
dev_warn_ratelimited(sdev->dev, "warn: can't find PCM with DAI ID %d\n" ,
rtd->dai_link->id);
return 0 ;
}
if (hda && !hda->no_ipc_position) {
/* read position from IPC position */
pos = spcm->stream[substream->stream].posn.host_posn;
goto found;
}
pos = hda_dsp_stream_get_position(hstream, substream->stream, true );
found:
pos = bytes_to_frames(substream->runtime, pos);
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)
{
struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_component *scomp = sdev->component;
struct hdac_ext_stream *dsp_stream;
struct snd_sof_pcm *spcm;
int direction = substream->stream;
u32 flags = 0 ;
spcm = snd_sof_find_spcm_dai(scomp, rtd);
if (!spcm) {
dev_err(sdev->dev, "error: can't find PCM with DAI ID %d\n" , rtd->dai_link->id);
return -EINVAL;
}
/*
* if we want the . ack to work , we need to prevent the control from being mapped .
* The status can still be mapped .
*/
if (hda_disable_rewinds)
runtime->hw.info |= SNDRV_PCM_INFO_NO_REWINDS | SNDRV_PCM_INFO_SYNC_APPLPTR;
/*
* All playback streams are DMI L1 capable , capture streams need
* pause push / release to be disabled
*/
if (hda_always_enable_dmi_l1 && direction == SNDRV_PCM_STREAM_CAPTURE)
runtime->hw.info &= ~SNDRV_PCM_INFO_PAUSE;
/*
* Do not advertise the PAUSE support if it is forced to be disabled via
* module parameter or if the pause_supported is false for the PCM
* device
*/
if (hda_force_pause_support == 0 ||
(hda_force_pause_support == -1 &&
!spcm->stream[substream->stream].pause_supported))
runtime->hw.info &= ~SNDRV_PCM_INFO_PAUSE;
if (hda_always_enable_dmi_l1 ||
direction == SNDRV_PCM_STREAM_PLAYBACK ||
spcm->stream[substream->stream].d0i3_compatible)
flags |= SOF_HDA_STREAM_DMI_L1_COMPATIBLE;
dsp_stream = hda_dsp_stream_get(sdev, direction, flags);
if (!dsp_stream) {
dev_err(sdev->dev, "error: no stream available\n" );
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);
/* Limit the maximum number of periods to not exceed the BDL entries count */
if (runtime->hw.periods_max > HDA_DSP_MAX_BDL_ENTRIES)
snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
runtime->hw.periods_min,
HDA_DSP_MAX_BDL_ENTRIES);
/* Only S16 and S32 supported by HDA hardware when used without DSP */
if (sdev->dspless_mode_selected)
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 avoid immediate xrun by the initial burst we need to place
* constraint on the period size ( via PERIOD_TIME ) to cover the size of
* the host buffer .
* We need to add headroom of max 10 ms as the firmware needs time to
* settle to the 1 ms pacing and initially it can run faster for few
* internal periods .
*
* On capture the DMA will transfer 1 ms chunks .
*/
if (spcm->stream[direction].dsp_max_burst_size_in_ms) {
unsigned int period_time = spcm->stream[direction].dsp_max_burst_size_in_ms;
/*
* add headroom over the maximum burst size to cover the time
* needed for the DMA pace to settle .
* Limit the headroom time to HDA_MAX_PERIOD_TIME_HEADROOM
*/
period_time += min(period_time, HDA_MAX_PERIOD_TIME_HEADROOM);
snd_pcm_hw_constraint_minmax(substream->runtime,
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
period_time * USEC_PER_MSEC,
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)
{
struct hdac_stream *hstream = substream->runtime->private_data;
int direction = substream->stream;
int ret;
ret = hda_dsp_stream_put(sdev, direction, hstream->stream_tag);
if (ret) {
dev_dbg(sdev->dev, "stream %s not opened!\n" , substream->name);
return -ENODEV;
}
/* unbinding pcm substream to hda stream */
substream->runtime->private_data = NULL;
return 0 ;
}
EXPORT_SYMBOL_NS(hda_dsp_pcm_close, "SND_SOC_SOF_INTEL_HDA_COMMON" );
Messung V0.5 in Prozent C=92 H=99 G=95
¤ Dauer der Verarbeitung: 0.11 Sekunden
(vorverarbeitet am 2026-09-28)
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*© Formatika GbR, Deutschland
2026-10-10
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