[alsa-devel] Problem bringing up new alsa driver

[Jon Smirl]

My new ALSA driver is playing the first three samples in a loop. It's
not progressing forward in the wav file.  It's behaving like I'm not
calling snd_pcm_period_elapsed() but I have a printk() in it so I'm
sure it is being called. Later samples are not getting copied into the
DMA buffer,

Can anyone give me a clue as to what to look for?

root at phyCORE-MPC5200B-tiny:~ aplay phone.wav
snd_pcm_playback_open
snd_pcm_open
snd_pcm_open_file
snd_pcm_open_substream
mpc5200-psc-ac97 f0002200.sound: psc_dma_startup(substream=c78bd800)
mpc5200-psc-ac97 f0002200.sound: psc_dma_pcm_open(substream=c78bd800)
Playing WAVE 'phone.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
mpc5200-psc-ac97 f0002200.sound:
psc_ac97_hw_analog_params(substream=c78bd800) p_size=5513
p_bytes=22052 periods=3 buffer_size=22050  buffer_bytes=88200
channels=2
snd_pcm_prepare
stac9766: ac97_analog_prepare rate 44100
mpc5200-psc-ac97 f0002200.sound: psc_dma_trigger(substream=c78bd800,
cmd=1) stream_id=0
snd_pcm_hwsync
snd_pcm_update_hw_ptr
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 5513
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 11026
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 0
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 5513
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 11026
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 0
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 5513
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 11026
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 0
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 5513
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 11026
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 0
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 5513
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 11026
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 0
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 5513
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 11026
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 0
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 5513
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 11026
snd_pcm_period_elapsed
snd_pcm_update_hw_ptr_interrupt 0
Aborted by signal Interrupt...
mpc5200-psc-ac97 f0002200.sound: psc_dma_trigger(substream=c78bd800,
cmd=0) stream_id=0
mpc5200-psc-ac97 f0002200.sound: psc_dma_shutdown(substream=c78bd800)
mpc5200-psc-ac97 f0002200.sound: psc_dma_pcm_close(substream=c78bd800)
root at phyCORE-MPC5200B-tiny:

-- 
Jon Smirl
jonsmirl at gmail.com
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