linux-kernel - Re: [PATCH] ARM: hw_breakpoint: Enable debug powerdown only if system supports 'has

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Message-ID: <20130319102803.GB22452@mudshark.cambridge.arm.com>
Date:	Tue, 19 Mar 2013 10:28:03 +0000
From:	Will Deacon <will.deacon@....com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
Cc:	Will Deacon <will@...ldeacon.co.uk>,
	Lokesh Vutla <lokeshvutla@...com>,
	Dietmar Eggemann <Dietmar.Eggemann@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] ARM: hw_breakpoint: Enable debug powerdown only if
 system supports 'has_ossr'

On Tue, Mar 19, 2013 at 06:39:38AM +0000, Santosh Shilimkar wrote:
> On Monday 18 March 2013 10:36 PM, Will Deacon wrote:
> > Any chance you could follow up with your firmware/hardware guys about this
> > please? I'd really like to understand how we end up in this state in case we
> > can do something in the architecture to stop it from happening in future.
> > 
> I will check on this part and update you when I hear from them.

Ok, thanks.

Dietmar -- I seem to remember that you thought GDB did actually work with
hardware breakpoints on Pandaboard across low-power states. Can you
confirm/deny this please?

> > Well, we could just add the warn_once prints but that doesn't stop debug
> > from breaking after the first pm/suspend/hotplug operation.
> > 
> Probably we should drop the $subject patch approach and use warn_once
> at least for current rc. Ofcourse it doesn't help to get working
> hw_breakpoint support. Patch end of the email with warn_once.

Yeah, I'll merge that, but it's a real shame that this breaks hardware debug
on one of the few platforms where it was reported to work.

Will
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