linux-kernel - Re: [PATCH V2] cpuidle/powernv: Read target_residency value of idle states from DT if available

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Date:	Wed, 28 Jan 2015 20:15:28 +1100
From:	Stewart Smith <stewart@...ux.vnet.ibm.com>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>, mpe@...erman.id.au
Cc:	rafael.j.wysocki@...el.com, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH V2] cpuidle/powernv: Read target_residency value of idle states from DT if available

Preeti U Murthy <preeti@...ux.vnet.ibm.com> writes:
> The device tree now exposes the residency values for different idle states. Read
> these values instead of calculating residency from the latency values. The values
> exposed in the DT are validated for optimal power efficiency. However to maintain
> compatibility with the older firmware code which does not expose residency
> values, use default values as a fallback mechanism. While at it, handle some
> cleanups.

>From a "I just merged the patch that exports these values from firmware"
point of view, using them and falling back looks good.

(I find the hardcoding of snooze in the driver a bit odd, as is the
hardcoding of max power states to 8 - which could bite us in the future
if a future processor has more states... but these aren't problems with
this patch)

Acked-by: Stewart Smith <stewart@...ux.vnet.ibm.com>

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