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Enable spdif-out #6

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Enable spdif-out #6

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eragefe
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@eragefe eragefe commented Sep 11, 2020

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@StephenInVamrs
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StephenInVamrs commented Sep 22, 2020 •
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Since your patch for rockpis-spdif-out is merged, I close this PR. Thanks.

RadxaStephen pushed a commit that referenced this pull request Oct 27, 2022
@rkhuangtao
ASoC: rockchip: Add support for Digital Loopback
9975bc5 
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 <[email protected]>
Change-Id: I5772f0694f7a14a0f0bd1f0777b6c4cdbd781a64
RadxaStephen pushed a commit that referenced this pull request Aug 3, 2024
@q2ven @gregkh
pipe: make poll_usage boolean and annotate its access
e6acf86 
commit f485922 upstream.

Patch series "Fix data-races around epoll reported by KCSAN."

This series suppresses a false positive KCSAN's message and fixes a real
data-race.


This patch (of 2):

pipe_poll() runs locklessly and assigns 1 to poll_usage.  Once poll_usage
is set to 1, it never changes in other places.  However, concurrent writes
of a value trigger KCSAN, so let's make KCSAN happy.

BUG: KCSAN: data-race in pipe_poll / pipe_poll

write to 0xffff8880042f6678 of 4 bytes by task 174 on cpu 3:
 pipe_poll (fs/pipe.c:656)
 ep_item_poll.isra.0 (./include/linux/poll.h:88 fs/eventpoll.c:853)
 do_epoll_wait (fs/eventpoll.c:1692 fs/eventpoll.c:1806 fs/eventpoll.c:2234)
 __x64_sys_epoll_wait (fs/eventpoll.c:2246 fs/eventpoll.c:2241 fs/eventpoll.c:2241)
 do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
 entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:113)

write to 0xffff8880042f6678 of 4 bytes by task 177 on cpu 1:
 pipe_poll (fs/pipe.c:656)
 ep_item_poll.isra.0 (./include/linux/poll.h:88 fs/eventpoll.c:853)
 do_epoll_wait (fs/eventpoll.c:1692 fs/eventpoll.c:1806 fs/eventpoll.c:2234)
 __x64_sys_epoll_wait (fs/eventpoll.c:2246 fs/eventpoll.c:2241 fs/eventpoll.c:2241)
 do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
 entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:113)

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 177 Comm: epoll_race Not tainted 5.17.0-58927-gf443e374ae13 #6
Hardware name: Red Hat KVM, BIOS 1.11.0-2.amzn2 04/01/2014

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 3b84482 ("pipe: avoid unnecessary EPOLLET wakeups under normal loads")
Signed-off-by: Kuniyuki Iwashima <[email protected]>
Cc: Alexander Duyck <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Kuniyuki Iwashima <[email protected]>
Cc: "Soheil Hassas Yeganeh" <[email protected]>
Cc: "Sridhar Samudrala" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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2 participants
@eragefe @StephenInVamrs