Re: [2.6.0-test4] IDE power management

[Benjamin Herrenschmidt]

> hda: start_power_step(step: 0)
> hda: start_power_step(step: 1)
> hda: complete_power_step(step: 1, stat: 50, err:0)
> hda: completing PM request, suspend
> hda: a request made it's way while we are power managing
> --- power down/up occurs here
> hda: Wakeup request inited, waiting for !BSY...
> hda: start_power_step(step: 1000)
> hda: completing PM request, resume
> ...
> hda: lost interrupt
> 
> The hard disk won't allow any accesses any more.
> 
> APM suspend to RAM doesn't work properly on this machine, so I haven't
> tested that.

I'm afraid we may have APM junk getting in our way. It would be
interesting to check out what is the request that made its way while
power managing, though I usually consider this is harmless...

The lost interrupt problem may or may not be related, it could well
be an IRQ routing problem as well. Did you have DMA enabled ? What
happens if you disable that before suspend ? You can also add some
printk to piix_config_drive_xfer_rate() in piix.c to check if that
is properly getting called and doesn't fail.

Ben.


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