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drm/nouveau: use static vidshift of 2 on volt 0x30 tables

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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>
This commit is contained in:
Ben Skeggs 2011-03-31 10:39:44 +10:00
parent 50066f8117
commit 475feffabe
1 changed files with 9 additions and 1 deletions
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10
drivers/gpu/drm/nouveau/nouveau_volt.c
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@ -159,8 +159,16 @@ nouveau_volt_init(struct drm_device *dev)
headerlen = volt[1];
recordlen = volt[2];
entries = volt[3];
vidshift = hweight8(volt[5]);
vidmask = volt[4];
/* no longer certain what volt[5] is, if it's related to
* the vid shift then it's definitely not a function of
* how many bits are set.
*
* after looking at a number of nva3+ vbios images, they
* all seem likely to have a static shift of 2.. lets
* go with that for now until proven otherwise.
*/
vidshift = 2;
break;
default:
NV_WARN(dev, "voltage table 0x%02x unknown\n", volt[0]);