ARM diagnostic register across suspend/resume

[Russell King - ARM Linux]

On Tue, Jun 17, 2014 at 11:21:23AM +0100, Will Deacon wrote:
> I think that actually works ok, because writing zeroes doesn't actually
> do anything as far as I understand. The problem with suspend/resume is
> that the suspend/resume cycle could well clear the internal state and
> writing zeroes won't re-enable the workaround bits.
> 
> I'll double-check this with the hardware guys, since this register really
> is undocumented.

Are you saying that it is write one to set, and writing zero is ignored?
If that's true, we should simplify the work-around code to get rid of the
read-modify-write.

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