linux-kernel - Re: [PATCH v5 1/5] powernv:idle: Add IDLE_STATE_ENTER_SEQ

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Message-ID: <20170112094237.GB3006@localhost.localdomain>
Date:   Thu, 12 Jan 2017 15:12:37 +0530
From:   Balbir Singh <bsingharora@...il.com>
To:     "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Michael Neuling <mikey@...ling.org>,
        Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
        "Shreyas B. Prabhu" <shreyasbp@...il.com>,
        Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        Stewart Smith <stewart@...ux.vnet.ibm.com>,
        Balbir Singh <bsingharora@...il.com>,
        Oliver O'Halloran <oohall@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>, mark.rutland@....com
Subject: Re: [PATCH v5 1/5] powernv:idle: Add IDLE_STATE_ENTER_SEQ_NORET macro

On Tue, Jan 10, 2017 at 02:37:00PM +0530, Gautham R. Shenoy wrote:
> From: "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
> 
> Currently all the low-power idle states are expected to wake up
> at reset vector 0x100. Which is why the macro IDLE_STATE_ENTER_SEQ
> that puts the CPU to an idle state and never returns.
> 
> On ISA v3.0, when the ESL and EC bits in the PSSCR are zero, the CPU
> is expected to wake up at the next instruction of the idle
> instruction.
> 
> This patch adds a new macro named IDLE_STATE_ENTER_SEQ_NORET for the
> no-return variant and reuses the name IDLE_STATE_ENTER_SEQ
> for a variant that allows resuming operation at the instruction next
> to the idle-instruction.
> 
> Signed-off-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>
> ---
> No changes from v4
>

Acked-by: Balbir Singh <bsingharora@...il.com>