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

From: Daniel Lezcano
Date: Mon Feb 08 2016 - 09:31:07 EST


On 02/01/2016 01:00 PM, 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@xxxxxxx>
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Applied to my tree for 4.6.

Thanks

- Daniel