linux-kernel - Re: [PATCH] acerhdf: Fix fan activation with new thermal governor

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Date:	Mon, 25 Feb 2013 11:25:26 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	Peter Feuerer <peter@...e.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Durgadoss R <durgadoss.r@...el.com>,
	Andreas Mohr <andi@...as.de>,
	Alexander Lam <azl@...rew.cmu.edu>, bp@...e.de
Subject: Re: [PATCH] acerhdf: Fix fan activation with new thermal governor

On Mon, Feb 25, 2013 at 11:21:54AM +0800, Zhang Rui wrote:
> the reason we keep on calling it because the thermal zone trip point
> info may be changed at runtime.
> 
> > Can we pass trip points and temperature levels upon registration time
> > instead?
> > 
> no, but we can cache it in the thermal layer, and do update when
> necessary.

Right, so this would make sense for fan, etc drivers which have static
trip points.

> why? I do not think the stepwise scheme will break it. If it happens, we
> should fix stepwise governor instead.

Ok, see my earlier mail for what acerhdf would need to be able to do.

> >  Therefore, add two more trip points - an
> > active one where we turn on the fan, and a critical one.
> > 
> I think you add a passive trip point and a critical one here.

I got 3 in total:

    if (trip == 0)
+           *type = THERMAL_TRIP_PASSIVE;
+   else if (trip == 1)
            *type = THERMAL_TRIP_ACTIVE;
+   else if (trip == 2)
+           *type = THERMAL_TRIP_CRITICAL;

> has anybody checked if the patch at lkml.org/lkml/2012/12/30/47 fixes
> the problem, without any other patch?

Ok, let me try it out.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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