Bug 87395

 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

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