target/linux/brcm2708/patches-4.19/950-0448-staging-bcm2835-audio-Fix-incorrect-draining-handlin.patch

   1 From 0938ad598509c19a256d5fc63b9002ad9cf59a14 Mon Sep 17 00:00:00 2001
   2 From: Takashi Iwai <tiwai@suse.de>
   3 Date: Tue, 4 Sep 2018 17:58:38 +0200
   4 Subject: [PATCH 448/703] staging: bcm2835-audio: Fix incorrect draining
   5  handling
   6
   7 commit 7d2a91f5f1bcf08ca257bcf1ed9721fcd341f834 upstream.
   8
   9 The handling of SNDRV_PCM_TRIGGER_STOP at the trigger callback is
  10 incorrect: when the STOP is issued, the driver is supposed to drop the
  11 stream immediately.  Meanwhile bcm2835 driver checks the DRAINING
  12 state and tries to issue some different command.
  13
  14 This patch straightens things a bit, dropping the incorrect state
  15 checks.  The draining behavior would be still not perfect at this
  16 point, but will be improved in a later patch.
  17
  18 Signed-off-by: Takashi Iwai <tiwai@suse.de>
  19 Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
  20 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  21 ---
  22  .../vc04_services/bcm2835-audio/bcm2835-pcm.c  | 18 ++++++------------
  23  1 file changed, 6 insertions(+), 12 deletions(-)
  24
  25 --- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
  26 +++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
  27 @@ -153,7 +153,6 @@ static int snd_bcm2835_playback_open_gen
  28         chip->alsa_stream[idx] = alsa_stream;
  29
  30         chip->opened |= (1 << idx);
  31 -       alsa_stream->draining = 1;
  32
  33  out:
  34         mutex_unlock(&chip->audio_mutex);
  35 @@ -268,6 +267,7 @@ static int snd_bcm2835_pcm_prepare(struc
  36         alsa_stream->buffer_size = snd_pcm_lib_buffer_bytes(substream);
  37         alsa_stream->period_size = snd_pcm_lib_period_bytes(substream);
  38         alsa_stream->pos = 0;
  39 +       alsa_stream->draining = false;
  40
  41         audio_debug("buffer_size=%d, period_size=%d pos=%d frame_bits=%d\n",
  42                 alsa_stream->buffer_size, alsa_stream->period_size,
  43 @@ -312,21 +312,15 @@ static int snd_bcm2835_pcm_trigger(struc
  44         switch (cmd) {
  45         case SNDRV_PCM_TRIGGER_START:
  46                 err = bcm2835_audio_start(alsa_stream);
  47 -               if (!err)
  48 -                       alsa_stream->draining = 1;
  49 -               else
  50 +               if (err)
  51                         audio_error(" Failed to START alsa device (%d)\n", err);
  52                 break;
  53 +       case SNDRV_PCM_TRIGGER_DRAIN:
  54 +               alsa_stream->draining = true;
  55 +               break;
  56         case SNDRV_PCM_TRIGGER_STOP:
  57 -               if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
  58 -                       audio_info("DRAINING\n");
  59 -                       alsa_stream->draining = 1;
  60 -               } else {
  61 -                       audio_info("DROPPING\n");
  62 -                       alsa_stream->draining = 0;
  63 -               }
  64                 err = bcm2835_audio_stop(alsa_stream);
  65 -               if (err != 0)
  66 +               if (err)
  67                         audio_error(" Failed to STOP alsa device (%d)\n", err);
  68                 break;
  69         default: