period crossing page boundary

[Giuliano Pochini <pochini@shiny.it>]

I'm facing another *£%@ problem. When period size is a multiple or
submultiple of PAGE_SIZE, it works fine, but when it isn't, sound
clicks, pops, repeapeapeats, skps :(( And since the period never crosses
physically the page boundary because I split it when it happens, I can't
imagine what's wrong. Perhaps some of you had the same problem.

.period callback does this:

bufsize=substream->runtime->periods*substream->runtime->period_size;
//addr==number of bytes transferred.
pos=bytes_to_frames(substream->runtime, addr);
return(pos%bufsize);

Here is a log of sg list construction:

AddX=period n
pa=page addr
phy=snd_sgbuf_get_addr(sgbuf, offs)
sz=sub-period size

aplay -B139319 -F69660 (OK)
pcm_hw_params (bufsize=24576 periods=2 persize=12288)
pcm_hw_params table size=131072 pages=32
pcm_hw_params Add0 (off=0 pa=f3ff000 phy=f3ff000 sz=4096)
pcm_hw_params Add0 (off=4096 pa=f3fe000 phy=f3fe000 sz=4096)
pcm_hw_params Add0 (off=8192 pa=f3fd000 phy=f3fd000 sz=4096)irq
pcm_hw_params Add1 (off=12288 pa=f3fc000 phy=f3fc000 sz=4096)
pcm_hw_params Add1 (off=16384 pa=f417000 phy=f417000 sz=4096)
pcm_hw_params Add1 (off=20480 pa=f416000 phy=f416000 sz=4096)irq
pcm_hw_params End (off=24576 rest=0)

aplay -B139319 -F34830 (noise-party)
pcm_hw_params (bufsize=24576 periods=4 persize=6144)
pcm_hw_params table size=131072 pages=32
pcm_hw_params Add0 (off=0 pa=f3ff000 phy=f3ff000 sz=4096)
pcm_hw_params Add0 (off=4096 pa=f3fe000 phy=f3fe000 sz=2048)irq
pcm_hw_params Add1 (off=6144 pa=f3fe000 phy=f3fe800 sz=2048)
pcm_hw_params Add1 (off=8192 pa=f3fd000 phy=f3fd000 sz=4096)irq
pcm_hw_params Add2 (off=12288 pa=f3fc000 phy=f3fc000 sz=4096)
pcm_hw_params Add2 (off=16384 pa=f417000 phy=f417000 sz=2048)irq
pcm_hw_params Add3 (off=18432 pa=f417000 phy=f417800 sz=2048)
pcm_hw_params Add3 (off=20480 pa=f416000 phy=f416000 sz=4096)irq
pcm_hw_params End (off=24576 rest=0)


Bye.




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