Re: period crossing page boundary

[Takashi Iwai <tiwai@suse.de>]

At 19 Mar 2003 12:24:30 +0000,
Giuliano Pochini wrote:
> 
> 
> 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:

do you mean pointer callback?

> 
> bufsize=substream->runtime->periods*substream->runtime->period_size;

you already have substream->runtime->buffer_size for this.

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

i suppose addr is updated in the interrupt handler, right?

> 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)

the logs seem fine.

did you set up page callback, too?

were the irqs issued correctly with the 1.5 page periods?
i mean, at the proper timing?


maybe it would be easier to debug if you show the actual code and the
hardware spec...


Takashi


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