PCM access type */
typedef enum _snd_pcm_access {
	/** mmap access with simple interleaved channels */
	SND_PCM_ACCESS_MMAP_INTERLEAVED = 0,
	/** mmap access with simple non interleaved channels */
	SND_PCM_ACCESS_MMAP_NONINTERLEAVED,
	/** mmap access with complex placement */
	SND_PCM_ACCESS_MMAP_COMPLEX,
	/** snd_pcm_readi/snd_pcm_writei access */
	SND_PCM_ACCESS_RW_INTERLEAVED,
	/** snd_pcm_readn/snd_pcm_writen access */
	SND_PCM_ACCESS_RW_NONINTERLEAVED,
	SND_PCM_ACCESS_LAST = SND_PCM_ACCESS_RW_NONINTERLEAVED
} snd_pcm_access_t;


which access type do your sound card support ?

aplay -D hw:0,0 --dump-hw-params any.wav

-    if (!_use_mmap)
-        _use_tsched = false;
-

pulseaudio only support SND_PCM_ACCESS_MMAP_INTERLEAVED  and SND_PCM_ACCESS_RW_INTERLEAVED

it fallback to use SND_PCM_ACCESS_RW_INTERLEAVED when driver only support SND_PCM_ACCESS_MMAP_COMPLEX and SND_PCM_ACCESS_RW_INTERLEAVED since pulseaudio does not support SND_PCM_ACCESS_MMAP_COMPLEX

# cat /proc/asound/card0/pcm1p/sub0/hw_params
cat hw_params 
access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 4096
buffer_size: 4096

Sorry my aplay couldn't recognize '--dump-hw-params', but my pulse running on SND_PCM_ACCESS_RW_INTERLEAVED mode.

Thanks,
KimJeongYeon

period_size: 4096
buffer_size: 4096

do your sound card really support one period per buffer ?

In case of my card with test patch, 'mmap=0 tsched=1' configured one period per buffer due to enabling tsched mode. Is this general scenario while use tsched mode?

If I tried to disable tsched mode, it configured half of 4095 period x 2 periods automatically.

do your sound card work with aplay since aplay don't like period size == buffer size ?

http://git.alsa-project.org/?p=alsa-utils.git;a=commitdiff;h=946078f8c4cefcd99b20c155c0d38a1e23058395;hp=65dde04e4efa13a955199dcba94a58997eb0ec20

Sorry for confusing, it was executed via paplay, (not a aplay)

period_size: 4096
buffer_size: 4096

were shown when I run 'paplay test.wav'.

1) alsa-sink with non-mmap + enable tshced (applied test patch)

# paplay test.wav &

# cat /proc/asound/card0/pcm1p/sub0/hw_params
access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 4096
buffer_size: 4096


2) alsa-sink with non-mmap + enable tshced but it became turned-off (original code)

# paplay test.wav &

# cat /proc/asound/card0/pcm1p/sub0/hw_params
access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 2048
buffer_size: 4096

you have to provide pulseaudio log with and without your patch ?

did you change any paraemeter in daemon.conf and default.pa ?

do you mean that module-udev-detect missing parameter to change mmap ?

http://lists.freedesktop.org/archives/pulseaudio-discuss/2014-October/022018.html

for irq mode, default fragment is 4 and 25 ms fragment time 

do your driver 's hardware constraints

periods_min = 1
periods_max =2

timer scheduling is disabled when

http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa?id=826c8f69d34ef49e86fe0ab6c93c1ffba8916131

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/soc/soc-generic-dmaengine-pcm.c?id=478028e088d6a94666d8a776be2cd2291faf3bbd

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/include/linux/dmaengine.h



DMA_RESIDUE_GRANULARITY_BURST: Residue is updated after each transferred
 *  burst. This is typically only supported if the hardware has a progress
 *  register of some sort (E.g. a register with the current read/write address
 *  or a register with the amount of bursts/beats/bytes that have been
 *  transferred or still need to be transferred).
 */
enum dma_residue_granularity {
	DMA_RESIDUE_GRANULARITY_DESCRIPTOR = 0,
	DMA_RESIDUE_GRANULARITY_SEGMENT = 1,
	DMA_RESIDUE_GRANULARITY_BURST = 2,
};

it was disabled by this patch 


http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa-util.c?id=045c1d602dcba57868845ba3270510593c39480f

+    if (!_use_mmap)
+        _use_tsched = FALSE;
+


access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 4096
buffer_size: 4096


if your sound card support one period per buffer , do it support disable period wakeup ?

http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa?id=051d82133f0ae6a57bf66fd200bc8e3591a7d5ca

-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/issues/320.