Re: Fan control in nouveau driver with geforce 9600gt

[Martin Peres <martin.peres@free.fr>]

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On 17/12/2012 13:35, Ozan Çağlayan wrote:
>> Hi Ozan,
>>
>> Please have a look at this documentation:
>> http://cgit.freedesktop.org/nouveau/linux-2.6/tree/Documentation/thermal/nouveau_thermal
>> It will tell you how to use fan management on your card :)
>>
>> Please report back! I am interested in your results!
>>
>> Martin
> Hey this is nice! I'll try it tonight when I'm back home.
>
> Thanks :)
>
Here you go :)

I managed to reproduce the issue. Please test this patch!

Thanks for reporting,
Martin

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>From 0227e8a93c697c325fb89b31b16aa5fe565c64d5 Mon Sep 17 00:00:00 2001
From: Martin Peres <martin.peres@labri.fr>
Date: Mon, 17 Dec 2012 23:46:22 +0100
Subject: [PATCH] drm/nouveau/fan: handle the cases where we are outside of the
 linear zone

Signed-off-by: Martin Peres <martin.peres@labri.fr>
---
 drivers/gpu/drm/nouveau/core/subdev/therm/base.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/core/subdev/therm/base.c b/drivers/gpu/drm/nouveau/core/subdev/therm/base.c
index b35b4a2..25b7f6a 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/therm/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/therm/base.c
@@ -71,6 +71,13 @@ nouveau_therm_update_linear(struct nouveau_therm *therm)
 	u8  temp = therm->temp_get(therm);
 	u16 duty;
 
+	/* handle the non-linear part first */
+	if (temp < linear_min_temp)
+		return priv->fan->bios.min_duty;
+	else if (temp > linear_max_temp)
+		return priv->fan->bios.max_duty;
+
+	/* we are in the linear zone */
 	duty  = (temp - linear_min_temp);
 	duty *= (priv->fan->bios.max_duty - priv->fan->bios.min_duty);
 	duty /= (linear_max_temp - linear_min_temp);
-- 
1.8.0.2


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