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Re: [PATCH -queue 1/2] [loongson] 2f: add suspend support framework

To: Wu Zhangjin <>
Subject: Re: [PATCH -queue 1/2] [loongson] 2f: add suspend support framework
From: Pavel Machek <>
Date: Wed, 11 Nov 2009 11:33:04 +0100
Cc: Ralf Baechle <>,,,, Len Brown <>, "Rafael J. Wysocki" <>,
In-reply-to: <>
Original-recipient: rfc822;
References: <> <>
User-agent: Mutt/1.5.20 (2009-06-14)
On Wed 2009-11-11 14:57:05, Wu Zhangjin wrote:
> (Add CC to Rafael J. Wysocki, Len Brown and Pavel Machek)
> This patch add basic suspend support for loongson2f family machines,
> loongson2f have a specific feature: when we set it's frequency to ZERO,
> it will go into a wait mode, and then can be waked up by the external
> interrupt. so, if we setup suitable interrupts before putting it into
> wait mode, we will be able wake it up whenever we want via sending the
> relative interrupts to it.
> These interrupts are board-specific, Yeeloong2F use the keyboard
> interrupt and SCI interrupt, but LingLoong and Fuloong2F use the
> interrupts connected to the processors directly. and BTW: some old
> LingLoong and FuLoong2F have no such interrupts connected, so, there is
> no way to wake them up from suspend mode. and therefore, please do not
> enable the kernel support for them.
> The board-specific support will be added in the coming patches.
> Signed-off-by: Wu Zhangjin <>

Comments are slighlty "interesting", but otherwise it looks ok.

> +     /* stop all perf counters */
> +     stop_perf_counters();

This is not exactly useful comment, right?

> +     /* mach specific suspend */
> +     mach_suspend();
> +     /* mach specific resume */
> +     mach_resume();

It is probably ok, but you may want to avoid them in future.


(cesky, pictures)

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