From mboxrd@z Thu Jan  1 00:00:00 1970
From: Raymond Yau <superquad.vortex2@gmail.com>
Subject: Re: playback write error(DMA or IRQ trouble?)
Date: Fri, 20 May 2011 13:22:40 +0800
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References: <20110520051016.D9F781F68CF@c-in3ws--03-04.sv2.lotuslive.com>
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2011/5/20  <innoway@mymelody.com>:
> =A0I develop an embedded system on the Linux board with Freescale i.MX27
> (ARM processor). =A0 I succeed on sound, which is transferred using
> Synchronous Serial Interface (SSI). It,s fine and then I try to do test
> of inserting or pulling out a USB memory stick in the USB host connector
> while sounding. =A0 I get the following error message from
> snd_pcm_lib_write1() of <linux src>/sound /core/pcm_lib.c after waiting
> for a while (about 10sec). =A0 =A0=A0=A0 playback=A0 write error (DMA or =
IRQ
> trouble?) =A0 and then from snd_pcm_drain() of <linux
> src>/sound/core/pcm_native.c =A0 =A0=A0 playback drain error (DMA or IRQ
> trouble?) =A0 (No sound during this period)
>
> and then it is sounding again.
>
> I want to prevent the sound from stopping even if something happens
> suddenly such as the USB memory stick is plugged in or out.
>
> I try to fix the above programs, but I don't succeed.
>
> Can someone give me the clue? =A0 [13:21:38]:/proc# cat interrupts
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 CPU0
> =A012:=A0=A0=A0=A0=A0=A0 3456=A0=A0=A0=A0=A0=A0=A0=A0 -=A0 mxc_i2c
> =A016:=A0=A0=A0=A0=A0=A0=A0 141 =A0 =A0 =A0 =A0=A0 -=A0 CSPI_IRQ
> =A018:=A0=A0=A0=A0=A0=A0=A0 952=A0=A0=A0=A0=A0=A0=A0=A0=A0 -=A0 mxcintuart
> =A026:=A0=A0=A0 1051255=A0=A0=A0=A0 -=A0 MXC Timer Tick
> =A028:=A0=A0=A0=A0=A0 29446=A0=A0=A0=A0=A0=A0=A0 -=A0 PCMCIA IRQ, ide0
> =A050:=A0=A0=A0=A0=A0=A0=A0=A0 33=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 -=A0 fec
> =A054:=A0=A0=A0=A0=A0=A0=A0 793=A0=A0=A0=A0=A0=A0=A0=A0=A0 -=A0 ehci_hcd:=
usb1
> =A056:=A0=A0=A0=A0=A0=A0=A0=A0=A0 1=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 -=A0=
 arc_udc
> =A061:=A0=A0=A0=A0=A0=A0=A0=A0=A0 0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =A0 -=A0 L=
CDC
> 117:=A0=A0=A0=A0=A0=A0=A0=A0=A0 0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 -=A0 m662=
91_udc
> 147:=A0=A0=A0=A0=A0=A0=A0=A0=A0 0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 -=A0 PMIC=
_IRQ
> 157:=A0=A0=A0=A0 337179=A0=A0=A0=A0 -=A0 SMSC_LAN911x_ISR
> 176:=A0=A0=A0=A0=A0=A0=A0=A0=A0 0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 -=A0 fec(=
MII)
>
> [13:35:03]:/proc# cat dma
> dma channel=A0 0: unused
> dma channel=A0 1: unused
> dma channel=A0 2: unused
> dma channel=A0 3: unused
> dma channel=A0 4: unused
> dma channel=A0 5: unused
> dma channel=A0 6: unused
> dma channel=A0 7: unused
> dma channel=A0 8: unused
> dma channel=A0 9: unused
> dma channel 10: unused
> dma channel 11: unused
> dma channel 12: unused
> dma channel 13: unused
> dma channel 14: unused
> dma channel 15: unused =A0 Thank you
>
> Masanori Inoue
>

This error also occur in snd-hda-intel

echo 32768 > /proc/asound/Intel/pcm0p/sub0/prealloc

speaker-test which use maximum buffer size also have (DMA or IRQ error
in system log

THis seem to be related to the schedule_timeout

		tout =3D schedule_timeout(msecs_to_jiffies(10000));

I guess this is why PA server treat avail  > 10 seconds is invalid