linux-kernel - Re: [PATCH v2] clocksource/arm_arch_timer: Enable and verify MMIO access

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Date:	Fri, 5 Feb 2016 15:29:12 +0000
From:	Robin Murphy <robin.murphy@....com>
To:	Stephen Boyd <sboyd@...eaurora.org>, daniel.lezcano@...aro.org
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	tglx@...utronix.de, mark.rutland@....com
Subject: Re: [PATCH v2] clocksource/arm_arch_timer: Enable and verify MMIO
 access

On 01/02/16 19:58, Stephen Boyd wrote:
> On 02/01, Robin Murphy wrote:
>> So far, we have been blindly assuming that having access to a
>> memory-mapped timer frame implies that the individual elements of that
>> frame frame are already enabled. Whilst it's the firmware's job to give
>> us non-secure access to frames in the first place, we should not rely
>> on implementations always being generous enough to also configure CNTACR
>> for those non-secure frames (e.g. [1]).
>>
>> Explicitly enable feature-level access per-frame, and verify that the
>> access we want is really implemented before trying to make use of it.
>>
>> [1]:https://github.com/ARM-software/tf-issues/issues/170
>>
>> Signed-off-by: Robin Murphy <robin.murphy@....com>
>> ---
>
> Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>
> Tested-by: Stephen Boyd <sboyd@...eaurora.org>

Great, thanks!

Daniel, am I right in hoping this is something you'll pick up, or should 
I be resending it to arm-soc?

Thanks,
Robin.