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Commit 475feffa authored by Ben Skeggs's avatar Ben Skeggs
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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: default avatarBen Skeggs <bskeggs@redhat.com>
parent 50066f81

drivers/gpu/drm/nouveau/nouveau_volt.c

+9 −1
Original line number Diff line number Diff line
@@ -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]);