CS46xx oddness

[Glenn Maynard <g_sf@zewt.org>]

(2.6.0 test11)

I'm seeing something odd with a CS46xx chip: if I don't set a buffer
size, or if I set it to 4k or 8k, then sound isn't played.  The buffer
fills up, and the device stays in SND_PCM_STATE_RUNNING.  If I set it
to 16k or 32k, it works.

I'm testing remotely on a user's machine, so I can't do much to
troubleshoot this (I'm not going to mess with his kernel).  In case
anyone's feeling brave, the relevant code is at

   http://cvs.sf.net/viewcvs.py/*checkout*/stepmania/stepmania/src/arch/Sound/ALSA9Helpers.cpp?rev=1.12

For reference, samplerate is 44100, channels is 2, and all dsnd* are
just pointers to snd*.  Sorry for not making a test case; it's 4am, so
I can't do it tonight, and this is a drop-in on IRC so I may not get
access to this machine again.  If nobody feels like looking at that
at all, I'll understand. :)

If it helps, here's /proc/asound/card0/pcm0p/sub0/* with an 8k, full buffer:

access: MMAP_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 8
buffer_size: 8192
tick_time: 1000
card: 0
device: 0
subdevice: 0
stream: PLAYBACK
id: CS46xx
name: CS46xx
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 31
subdevices_avail: 30
64
state: RUNNING
trigger_time: 1072258017.688694000
tstamp      : 1072258028.517208000
delay       : 512
avail       : 7680
avail_max   : 7680
-----
hw_ptr      : 0
appl_ptr    : 512
tstamp_mode: NONE
period_step: 1
sleep_min: 0
avail_min: 8
xfer_align: 8
start_threshold: 0
stop_threshold: 1073741824
silence_threshold: 0
silence_size: 0
boundary: 1073741824


-- 
Glenn Maynard


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