diff options
| author | Ben Skeggs <bskeggs@redhat.com> | 2011-03-31 10:39:44 +1000 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2011-05-16 10:47:47 +1000 |
| commit | 475feffabe7d42d3333bf9a17167f38f3c467d11 (patch) | |
| tree | d5f697308a3cd61d5711367fb2958e53ff1701d7 /drivers/gpu | |
| parent | 50066f8117d79163b96d3bf778c41961be1fe5cd (diff) | |
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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_volt.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_volt.c b/drivers/gpu/drm/nouveau/nouveau_volt.c index 04fdc00a67d5..75e872741d92 100644 --- a/drivers/gpu/drm/nouveau/nouveau_volt.c +++ b/drivers/gpu/drm/nouveau/nouveau_volt.c @@ -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]); |