6.7-stable review patch. If anyone has any objections, please let me know.
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From: Chancel Liu chancel.liu@nxp.com
[ Upstream commit cdac6e1f716419ce307ad3e44a718557a5469c17 ]
There's a use case that playback stream of a loopback cable works on RW_INTERLEAVED mode while capture stream works on MMAP_INTERLEAVED mode:
aplay -Dhw:Loopback,0,0 S32_48K_2ch.wav; arecord -Dplughw:Loopback,1,0 -fS32_LE -r16000 -c2 cap.wav;
The plug plugin handles only slave PCM support MMAP mode. Not only plug plugin but also other plugins like direct plugins(dmix/dsnoop/dshare) work on MMAP access mode. In this case capture stream is the slave PCM works on MMAP_INTERLEAVED mode. However loopback_check_format() rejects this access setting and return:
arecord: pcm_read:2240: read error: Input/output error
To fix it a function called is_access_interleaved() is introduced to get if access is interleaved mode. If both access of capture stream and playback stream is interleaved mode loopback_check_format() will allow this kind of access setting.
Fixes: 462494565c27 ("ALSA: aloop: Add support for the non-interleaved access mode") Signed-off-by: Chancel Liu chancel.liu@nxp.com Link: https://lore.kernel.org/r/20240111025219.2678764-1-chancel.liu@nxp.com Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- sound/drivers/aloop.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c index e87dc67f33c6..1c65e0a3b13c 100644 --- a/sound/drivers/aloop.c +++ b/sound/drivers/aloop.c @@ -322,6 +322,17 @@ static int loopback_snd_timer_close_cable(struct loopback_pcm *dpcm) return 0; }
+static bool is_access_interleaved(snd_pcm_access_t access) +{ + switch (access) { + case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED: + case SNDRV_PCM_ACCESS_RW_INTERLEAVED: + return true; + default: + return false; + } +}; + static int loopback_check_format(struct loopback_cable *cable, int stream) { struct snd_pcm_runtime *runtime, *cruntime; @@ -341,7 +352,8 @@ static int loopback_check_format(struct loopback_cable *cable, int stream) check = runtime->format != cruntime->format || runtime->rate != cruntime->rate || runtime->channels != cruntime->channels || - runtime->access != cruntime->access; + is_access_interleaved(runtime->access) != + is_access_interleaved(cruntime->access); if (!check) return 0; if (stream == SNDRV_PCM_STREAM_CAPTURE) { @@ -369,7 +381,8 @@ static int loopback_check_format(struct loopback_cable *cable, int stream) &setup->channels_id); setup->channels = runtime->channels; } - if (setup->access != runtime->access) { + if (is_access_interleaved(setup->access) != + is_access_interleaved(runtime->access)) { snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &setup->access_id); setup->access = runtime->access; @@ -584,8 +597,7 @@ static void copy_play_buf(struct loopback_pcm *play, size = play->pcm_buffer_size - src_off; if (dst_off + size > capt->pcm_buffer_size) size = capt->pcm_buffer_size - dst_off; - if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED || - runtime->access == SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED) + if (!is_access_interleaved(runtime->access)) copy_play_buf_part_n(play, capt, size, src_off, dst_off); else memcpy(dst + dst_off, src + src_off, size); @@ -1544,8 +1556,7 @@ static int loopback_access_get(struct snd_kcontrol *kcontrol, mutex_lock(&loopback->cable_lock); access = loopback->setup[kcontrol->id.subdevice][kcontrol->id.device].access;
- ucontrol->value.enumerated.item[0] = access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED || - access == SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; + ucontrol->value.enumerated.item[0] = !is_access_interleaved(access);
mutex_unlock(&loopback->cable_lock); return 0;