June 2008 - Alsa-devel - mailman.alsa-project.org

Re: [alsa-devel] [Alsa-user] Async behavior and -EAGAIN on write?
by Paul Adolph 02 Jun '08

02 Jun '08

>> For playback I am using the ALSA callback to wake up a thread that >> then feeds the ALSA ring buffer with a period-worth of samples using >> snd_pcm_writei(). I've set snd_pcm_sw_params_set_avail_min() to one >> period. The problem is that most of the time when my thread wakes up >> and tries to write the data, snd_pcm_writei() fails with -EAGAIN, and >> I must retry until it works. >> >> Presumably this write failure is because there is not enough space in >> the ring buffer, but then why did the ALSA callback fire in the first >> place? As it stands my retries are eating needless amounts of CPU. >> > > What does snd_pcm_avail_update return if you call it before > snd_pcm_writei in your callback? Taking the sleep out of my thread so I respond to the ALSA callback wakeups as often as possible, I found that snd_pcm_avail_update() returns very small values, usually less than 1/2 the period size and sometimes even 0! It seems as if I'm getting callbacks whenever ALSA feels like giving them. This behavior does not seem to change at all even with different settings of snd_pcm_sw_params_set_avail_min()! I must be missing some key thing in all this. Here are some of the readings. This is with snd_pcm_sw_params_set_avail_min(period_size) and period_size = 470 frames. avail = 68 avail = 202 avail = 336 avail = 0 avail = 134 >What period and buffer sizes do you use? I am using set_buffer/period_time_near and read back the actual values. I get the following with the settings I'm using. buffer_size : 7526 frames period_size : 470 frames I'm set to 22050 sampling rate, 16-bit signed interleaved samples. > FYI, you should seriously consider using poll() rather than the > async/callback interface. It's more efficient than signals and more > compatible with various IO plugins like pulseaudio. Yes - I'm looking into this for sure. This async mode has caused me lots of problems. My main issue is that I'm almost out of time to spend on this part of the project. :-( Thanks for your help.

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Re: [alsa-devel] [Alsa-user] Async behavior and -EAGAIN on write?
by Paul Adolph 02 Jun '08

02 Jun '08

>> For playback I am using the ALSA callback to wake up a thread that >> then feeds the ALSA ring buffer with a period-worth of samples using >> snd_pcm_writei(). I've set snd_pcm_sw_params_set_avail_min() to one >> period. The problem is that most of the time when my thread wakes up >> and tries to write the data, snd_pcm_writei() fails with -EAGAIN, and >> I must retry until it works. >> >> Presumably this write failure is because there is not enough space in >> the ring buffer, but then why did the ALSA callback fire in the first >> place? As it stands my retries are eating needless amounts of CPU. > No definitive help. I don't know the internals, but I have a guess. It > probably leads the > amount so that on busy systems, underruns don't occur. You could try > setting it to 2 buffer > min and still writing only a single buffer. That way, you have a buffer of > slack. It seems to make no difference what snd_pcm_sw_set_avail_min() value I use. I tried setting it from twice to many times the period size. I still get ALSA callbacks very often. When I check available space at each callback invocation using snd_pcm_avail_update(), I almost always get much less than this setting. Indeed most usually much less than a single period size. > You might have better luck trying this on the alsa-devel list. The > developers live there and they > know the internals. It is possible they will answer. Good idea. I am cross-posting this email. (Hopefully to no-one's annoyance...) > I went and looked at the function you are using. > (snip) > Are you using a buffer size compatible with your card. It is possible it is > using the closest one and that is less than the buffer size you have > defined. Just a thought. To set buffer sizes, I am using set_buffer/period_time_near() and taking whatever the card gives me - I read them back with the get functions. One weird thing I noticed is that my card give me a period size of 470 frames *always*, regardless of whatever desired buffer and period time I ask for. I don't think this issue is related to the async behavior weirdness though. Thanks for your help.

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[PATCH] Revert "wm9713: Expose the PLL configuration"
by Robert Jarzmik 01 Jun '08

01 Jun '08

This reverts commit 0d03f161680832984dd03f6bfc9a3423fc67501d. There's a bug in set_pll call from resume function. --- sound/soc/codecs/wm9713.c | 8 ++------ 1 files changed, 2 insertions(+), 6 deletions(-) diff --git a/sound/soc/codecs/wm9713.c b/sound/soc/codecs/wm9713.c index 5defac8..eae042c 100644 --- a/sound/soc/codecs/wm9713.c +++ b/sound/soc/codecs/wm9713.c @@ -659,7 +659,7 @@ struct pll_ { unsigned int k; }; -static struct pll_ pll[] = { +struct pll_ pll[] = { {13000000, 0, 1, 0, 0, 7, 0x23f488}, {2048000, 1, 0, 0, 0, 12, 0x0}, {4096000, 1, 0, 0, 0, 6, 0x0}, @@ -667,10 +667,9 @@ static struct pll_ pll[] = { /* liam - add more entries */ }; -static int wm9713_set_pll(struct snd_soc_dai *codec_dai, +static int wm9713_set_pll(struct snd_soc_codec *codec, int pll_id, unsigned int freq_in, unsigned int freq_out) { - struct snd_soc_codec *codec = codec_dai->codec; struct wm9713_data *wm9713 = codec->private_data; int i; u16 reg, reg2; @@ -1056,13 +1055,11 @@ static struct snd_soc_dai_caps wm9713_voice_playback = { static struct snd_soc_dai_ops wm9713_hifi_dai_ops = { /* alsa ops */ .prepare = ac97_hifi_prepare, - .set_pll = wm9713_set_pll, }; static struct snd_soc_dai_ops wm9713_aux_dai_ops = { /* alsa ops */ .prepare = ac97_aux_prepare, - .set_pll = wm9713_set_pll, }; static struct snd_soc_dai_ops wm9713_voice_dai_ops = { @@ -1074,7 +1071,6 @@ static struct snd_soc_dai_ops wm9713_voice_dai_ops = { .set_clkdiv = wm9713_set_dai_clkdiv, .set_fmt = wm9713_set_dai_fmt, .set_tristate = wm9713_set_dai_tristate, - .set_pll = wm9713_set_pll, }; /* for modprobe */ -- 1.5.5.3 --=-=-= Content-Type: application/octet-stream Content-Disposition: attachment; filename=sound_soc_pxa.tar.gz Content-Transfer-Encoding: base64 Content-Description: mioa701 board code H4sIALyrXkgAA+w8/XfaxrL9Ff8VG3riBw7GgO2ktROfSzB2aDBwALfNy8vRkUHYqoWkqw9/tM37 29/M7K60+gKcNr3vnltOG8PuzOzs7OzM7MxKvhPa871vvuqnAZ9Xh4f4t/nqsKH+lZ9vms1G69Vh 6/Cg1fqm0QSAl9+ww6/LFv+EfqB7jH3j/bIabl3/v+nHp/X3ndlX1IGnrf8hrv/LxuHf6/9XfOL1 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