linux-kernel - Re: [PATCH v2 4/6] ARM: firmware: add prepare

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Date:	Thu, 13 Feb 2014 09:37:05 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Tomasz Figa <t.figa@...sung.com>,
	Alexandre Courbot <acourbot@...dia.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Russell King <linux@....linux.org.uk>
CC:	Olof Johansson <olof@...om.net>,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, gnurou@...il.com
Subject: Re: [PATCH v2 4/6] ARM: firmware: add prepare_idle() operation

On 02/13/2014 04:01 AM, Tomasz Figa wrote:
> Hi Alexandre,
> 
> On 07.02.2014 05:35, Alexandre Courbot wrote:
>> Some firmwares do not put the CPU into idle mode themselves, but still
>> need to be informed that the CPU is about to enter idle mode before this
>> happens. Add a prepare_idle() operation to the firmware_ops structure to
>> handle such cases.
>>
>> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
>> ---
>>   arch/arm/include/asm/firmware.h | 4 ++++
>>   1 file changed, 4 insertions(+)
> 
> I wonder if .do_idle() couldn't simply return an appropriate error code
> to let the upper layer know that it should proceed with normal CPU idle
> activation, while still letting the firmware know that the CPU is going
> to idle.

That seems to disagree with the naming of the operation, and the
semantics I assume it has, though. It seems clearer to add an explicit
separate op for this.

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