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drm/nouveau: use static vidshift of 2 on volt 0x30 tables
Explanation is in the commit. If anyone has an example of where this is *not* the case, please report it! Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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1 changed files with 9 additions and 1 deletions
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@ -159,8 +159,16 @@ nouveau_volt_init(struct drm_device *dev)
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headerlen = volt[1];
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recordlen = volt[2];
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entries = volt[3];
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vidshift = hweight8(volt[5]);
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vidmask = volt[4];
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/* no longer certain what volt[5] is, if it's related to
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* the vid shift then it's definitely not a function of
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* how many bits are set.
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*
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* after looking at a number of nva3+ vbios images, they
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* all seem likely to have a static shift of 2.. lets
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* go with that for now until proven otherwise.
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*/
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vidshift = 2;
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break;
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default:
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NV_WARN(dev, "voltage table 0x%02x unknown\n", volt[0]);
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