Re: DMA disabled after lost interrupt (on ibook)
On Wed, 2005-08-03 at 23:00 +0200, Vivenzio Pagliari wrote:
> >> Yes, exactly same machine and same symptoms.
> >> i see these messages since a loooong time.
> >>
> >> it happens when i copy big files or when i do huge & fast files transfert
> >> via ftp/scp.
> >
> > Both of you are using Apple shipped hard disk or you replaced it ? We
> > might have to limit the timings to UDMA/4 on these machines it seems...
> >
> > Ben
>
> Hi,
>
> I had that "lost interrupt" another time today:
>
> Aug 3 21:51:56 garfield kernel: ide-pmac lost interrupt, \
> dma status: 8400
> Aug 3 21:51:56 garfield kernel: hda: lost interrupt
> Aug 3 21:51:56 garfield kernel: hda: dma_intr: status=0xd0 { Busy }
> Aug 3 21:51:56 garfield kernel:
> Aug 3 21:51:56 garfield kernel: ide: failed opcode was: unknown
> Aug 3 21:51:56 garfield kernel: hda: DMA disabled
> Aug 3 21:51:56 garfield kernel: ide0: reset: success
>
> Just in case that it may be of interest: I had configured my kernel
> (2.6.12.1) with CONFIG_PREEMPT=y.
> Several people on the list say that using PREEMPT is a bad idea on
> on ppc, so I've recompiled the kernel (now using 2.6.12.3) without it.
> But I guess this will not make any difference here, since I remember to
> have seen this problem already when I used a kernel from the Debian
> binary package (where PREEMPT is disabled).
Can you try tweaking the driver in drivers/ide/ppc/pmac.c, and put this
code in #if 0 :
/* Get cable type from device-tree */
if (pmif->kind == controller_kl_ata4 || pmif->kind == controller_un_ata6
|| pmif->kind == controller_k2_ata6
|| pmif->kind == controller_sh_ata6) {
char* cable = get_property(np, "cable-type", NULL);
if (cable && !strncmp(cable, "80-", 3))
pmif->cable_80 = 1;
}
/* G5's seem to have incorrect cable type in device-tree. Let's assume
* they have a 80 conductor cable, this seem to be always the case unless
* the user mucked around
*/
if (device_is_compatible(np, "K2-UATA") ||
device_is_compatible(np, "shasta-ata"))
pmif->cable_80 = 1;
(That is make sure cable_80 is never set to 1)
That will have the effect of slowing down your interface to U/DMA2. Let me know if
that helps.
Ben.
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