On Fri, 3 Feb 2006, Bartlomiej Zolnierkiewicz wrote:
> On 2/3/06, Matthew Garrett <[email protected]> wrote:
> > Bartlomiej Zolnierkiewicz <[email protected]> wrote:
> >
> > > This is untrue as Linux has support for setting IDE controller
> > > and drives. It was added by Benjamin Herrenschmidt in late
> > > 2.5.x or early 2.6.x (I don't remember exact kernel version).
> >
> > In generic_ide_resume, rqpm.pm_step gets set to
> > ide_pm_state_start_resume and ide_do_drive_cmd gets called. This ends up
> > being passed through to start_request. start_request waits for the BSY
> > bit to go away. On the affected hardware I've seen, this never happens
> > unless the ACPI calls are made. As far as I can tell, there's nothing in
> > the current driver code that does anything to make sure that the bus is
> > in a state to accept commands at this point - the pci drivers don't (for
> > the most part) seem to have any resume methods. Calling the ACPI _STM
> > method before attempting to do this magically makes everything work.
>
> I don't see anything that prevents addition of ->suspend and ->resume
> for IDE PCI host drivers (not IDE core issue) if some special sequence
> is needed.
>
> I see that we may be doing PIO/DMA setup too late (IDE core issue)
> for some controllers.
>
> Could you fill a bug at kernel bugzilla with data as much data about
> affected hardware as possible (dmesg, kernel config, lspci -vvv -xxx
> before susped and if possible PCI configuration dumped from kernel
> after suspend)?
>
> What is the current state of IDE ACPI patches?
> Were the issues raised on linux-ide addressed?
I haven't seen any updates to the drivers/ide/ patch from
Shaohua Li <[email protected]>. I'm beginning to work on
PATA ACPI object support that is similar to the current SATA ACPI
patches -- all for libata. Is this the right or wrong thing
to do?
Thanks,
--
~Randy
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