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drm/nv40/therm: increase the sensor's settling delay to 20ms

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Based on my experience, 10ms wasn't always enough. Let's bump that
to a little more.

If this turns out to be insufficient-enough again, then an approach
based on letting the sensor settle for several seconds before starting
polling on the temperature would be better suited. This way, boot time
wouldn't be impacted by those waits too much.

Signed-off-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Martin Peres 2013-03-05 10:35:20 +01:00 committed by Ben Skeggs
parent 7ae9712c60
commit eea4eb14a0
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/nouveau/core/subdev/therm/nv40.c
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@ -66,10 +66,11 @@ nv40_sensor_setup(struct nouveau_therm *therm)
if (style == NEW_STYLE) {
nv_mask(therm, 0x15b8, 0x80000000, 0);
nv_wr32(therm, 0x15b0, 0x80003fff);
mdelay(10); /* wait for the temperature to stabilize */
mdelay(20); /* wait for the temperature to stabilize */
return nv_rd32(therm, 0x15b4) & 0x3fff;
} else if (style == OLD_STYLE) {
nv_wr32(therm, 0x15b0, 0xff);
mdelay(20); /* wait for the temperature to stabilize */
return nv_rd32(therm, 0x15b4) & 0xff;
} else
return -ENODEV;