From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: ARM diagnostic register across suspend/resume
Date: Tue, 17 Jun 2014 11:25:20 +0100 [thread overview]
Message-ID: <20140617102519.GC13808@arm.com> (raw)
In-Reply-To: <20140617102344.GG23430@n2100.arm.linux.org.uk>
On Tue, Jun 17, 2014 at 11:23:44AM +0100, Russell King - ARM Linux wrote:
> 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.
That's my understanding for the diagnostic register, but I've asked for
clarification internally.
Will
next prev parent reply other threads:[~2014-06-17 10:25 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-17 8:31 ARM diagnostic register across suspend/resume Shawn Guo
2014-06-17 9:57 ` Will Deacon
2014-06-17 10:16 ` Russell King - ARM Linux
2014-06-17 10:21 ` Will Deacon
2014-06-17 10:23 ` Russell King - ARM Linux
2014-06-17 10:25 ` Will Deacon [this message]
2014-06-17 13:03 ` Shawn Guo
2014-06-17 14:34 ` Will Deacon
2014-06-17 14:54 ` Shawn Guo
2014-06-17 13:08 ` Shawn Guo
2014-06-17 14:02 ` Shawn Guo
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