armbian/linux-rockchip
0
0
Fork 0
mirror of https://github.com/armbian/linux-rockchip.git synced 2026-01-06 11:08:10 -08:00
Code Issues Packages Projects Releases Wiki Activity

ASoC: rockchip: Add support for Digital Loopback

Browse Source 
This patch add support for DMA-based digital loopback.

BACKGROUND
Audio Products with AEC require loopback for echo cancellation.
the hardware LP is not always available on some products, maybe
the HW limitation(such as internal acodec) or HW Cost-down.

This patch add support software DLP for such products.

Enable:

  CONFIG_SND_SOC_ROCKCHIP_DLP

  &i2s {
      rockchip,digital-loopback;
  };

Mode List:

  amixer contents
  numid=2,iface=MIXER,name='Software Digital Loopback Mode'
    ; type=ENUMERATED,access=rw------,values=1,items=7
    ; Item #0 'Disabled'
    ; Item #1 '2CH: 1 Loopback + 1 Mic'
    ; Item #2 '2CH: 1 Mic + 1 Loopback'
    ; Item #3 '2CH: 1 Mic + 1 Loopback-mixed'
    ; Item #4 '2CH: 2 Loopbacks'
    ; Item #5 '4CH: 2 Mics + 2 Loopbacks'
    ; Item #6 '4CH: 2 Mics + 1 Loopback-mixed'
    : values=0

Testenv:

wired SDO0 --> SDI0 directly to get external digital loopback
as reference.

Testcase: dlp.sh

  /#!/bin/sh

  item=0
  id=`amixer contents | grep "Software Digital Loopback" | \
      awk -F ',' '{print $1}'`

  items=`amixer contents | grep -A 1 "Software Digital Loopback" | \
         grep items | awk -F 'items=' '{print $2}'`

  echo "Software Digital Loopback: $id, items: $items"

  mode_chs() {
          case $1 in
          [0-4])
                  echo "2"
                  ;;
          [5-6])
                  echo "4"
                  ;;
          *)
                  echo "2"
                  ;;
          esac
  }

  while true
  do
          ch=`mode_chs $item`
          amixer -c 0 cset $id $item
          arecord -D hw:0,0 --period-size=1024 --buffer-size=4096 -r 48000 -c $ch -f s16_le \
                  -d 15 sine/dlp_$item.wav &
          sleep 2
          for i in $(seq 1 10)
          do
                  aplay -D hw:0,0 --period-size=1024 --buffer-size=8192 $((ch))ch.wav -d 1
          done
          pid=$(ps | egrep "aplay|arecord" | grep -v grep | awk '{print $1}' | sort -r)
          for p in $pid
          do
                  wait $p 2>/dev/null
          done
          item=$((item+1))
          if [ $item -ge $items ]; then
                  sleep 1
                  break
          fi
  done
  echo "Done"

Result:

do shell test and verify dlp_x.wav:

* Alignment: ~1 samples shift (loopback <-> mics).
* Integrity: no giltch, no data lost.
* AEC: align loopback and mics sample and do simple AEC, get clean
  waveform.

Logs:
...
numid=2,iface=MIXER,name='Software Digital Loopback Mode'
  ; type=ENUMERATED,access=rw------,values=1,items=7
  ; Item #0 'Disabled'
  ; Item #1 '2CH: 1 Loopback + 1 Mic'
  ; Item #2 '2CH: 1 Mic + 1 Loopback'
  ; Item #3 '2CH: 1 Mic + 1 Loopback-mixed'
  ; Item #4 '2CH: 2 Loopbacks'
  ; Item #5 '4CH: 2 Mics + 2 Loopbacks'
  ; Item #6 '4CH: 2 Mics + 1 Loopback-mixed'
  : values=2
Recording WAVE 'sine/dlp_2.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Playing WAVE '2ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
...
numid=2,iface=MIXER,name='Software Digital Loopback Mode'
  ; type=ENUMERATED,access=rw------,values=1,items=7
  ; Item #0 'Disabled'
  ; Item #1 '2CH: 1 Loopback + 1 Mic'
  ; Item #2 '2CH: 1 Mic + 1 Loopback'
  ; Item #3 '2CH: 1 Mic + 1 Loopback-mixed'
  ; Item #4 '2CH: 2 Loopbacks'
  ; Item #5 '4CH: 2 Mics + 2 Loopbacks'
  ; Item #6 '4CH: 2 Mics + 1 Loopback-mixed'
  : values=6
Recording WAVE 'sine/dlp_6.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Playing WAVE '4ch.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Channels 4
Done

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Change-Id: I5772f0694f7a14a0f0bd1f0777b6c4cdbd781a64
This commit is contained in:
Sugar Zhang
2022-07-04 18:49:47 +08:00
committed by Tao Huang
parent ba8a6e65a7
commit 9975bc50f3
4 changed files with 1116 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
sound/soc/rockchip/Kconfig
View File

@@ -7,6 +7,13 @@ config SND_SOC_ROCKCHIP
the Rockchip SoCs' Audio interfaces. You will also need to
select the audio interfaces to support below.
config SND_SOC_ROCKCHIP_DLP
tristate "Rockchip Digital Loopback Driver"
depends on SND_SOC_ROCKCHIP
help
Say Y or M if you want to add support for DLP driver for
Rockchip DMA-Based Digital Loopback.
config SND_SOC_ROCKCHIP_I2S
tristate "Rockchip I2S Device Driver"
depends on CLKDEV_LOOKUP && SND_SOC_ROCKCHIP

2
sound/soc/rockchip/Makefile
View File

@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
# ROCKCHIP Platform Support
snd-soc-rockchip-dlp-objs := rockchip_dlp.o
snd-soc-rockchip-i2s-objs := rockchip_i2s.o
snd-soc-rockchip-i2s-tdm-objs := rockchip_i2s_tdm.o
snd-soc-rockchip-multi-dais-objs := rockchip_multi_dais.o rockchip_multi_dais_pcm.o
@@ -14,6 +15,7 @@ snd-soc-rockchip-vad-$(CONFIG_ARM64) += vad_preprocess_arm64.o
snd-soc-rockchip-vad-$(CONFIG_ARM) += vad_preprocess_arm.o
endif
obj-$(CONFIG_SND_SOC_ROCKCHIP_DLP) += snd-soc-rockchip-dlp.o
obj-$(CONFIG_SND_SOC_ROCKCHIP_I2S) += snd-soc-rockchip-i2s.o
obj-$(CONFIG_SND_SOC_ROCKCHIP_I2S_TDM) += snd-soc-rockchip-i2s-tdm.o
obj-$(CONFIG_SND_SOC_ROCKCHIP_MULTI_DAIS) += snd-soc-rockchip-multi-dais.o

1079
sound/soc/rockchip/rockchip_dlp.c Normal file
View File

File diff suppressed because it is too large Load Diff

28
sound/soc/rockchip/rockchip_dlp.h Normal file
View File

@@ -0,0 +1,28 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Rockchip DLP (Digital Loopback) driver
*
* Copyright (C) 2022 Rockchip Electronics Co., Ltd
* Author: Sugar Zhang <sugar.zhang@rock-chips.com>
*
*/
#ifndef _ROCKCHIP_DLP_H
#define _ROCKCHIP_DLP_H
struct snd_dlp_config {
int (*get_fifo_count)(struct device *dev, int stream);
};
#if IS_REACHABLE(CONFIG_SND_SOC_ROCKCHIP_DLP)
int devm_snd_dmaengine_dlp_register(struct device *dev,
const struct snd_dlp_config *config);
#else
static inline int devm_snd_dmaengine_dlp_register(struct device *dev,
const struct snd_dlp_config *config)
{
return -ENOSYS;
}
#endif
#endif