Re: [PATCH] EDAC, altera: wrap edac pm with a CONFIG_PM

[Thor Thayer]

Hi Boris,

On 06/05/2015 10:15 AM, Borislav Petkov wrote:
> On Fri, Jun 05, 2015 at 08:49:15AM -0500, dinguyen@xxxxxxxxxxxxxxxxxxxxx wrote:
> > From: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx>
> >
> > Suspend-to-RAM and EDAC support are mutually exclusive on
> > SOCFPGA.  If the EDAC is enabled, it will prevent the
> > platform from going into suspend.
>
> Btw, what is exactly the problem with EDAC being enabled and not being
> able to suspend? Is it a hardware issue?
>
> Because if it is sw one, we probably could change the EDAC core to
> accomodate power management. On x86 we don't need to do anything special
> to EDAC wrt PM though - we simply suspend.
>
> Thanks.

Yes, in our case, it is a hardware issue but I'm still gathering 
information.

The IRQ vectors for OCRAM reside on DDR and in Suspend-to-RAM mode we're 
executing out of OCRAM. If an ECC error occurs, we can't handle it so it 
was decided to make them mutually exclusive.

Thor

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