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drm/nouveau/bios/volt: Handle voltage table version 0x50 with zeroed header

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Some Fermi+ GPUs specify VID information via voltage table entries, rather
than describing them as a range in the header.

The mask may be bigger than 0x1fffff, but this value is already >2V, so it
will be fine for now.

This patch fixes volting issues on those cards enabling them to switch
cstates.

v6: rework message

Signed-off-by: Karol Herbst <karolherbst@gmail.com>
Reviewed-by: Martin Peres <martin.peres@free.fr>
Tested-by: Pierre Moreau <pierre.morrow@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Karol Herbst 2016-07-12 21:36:08 +02:00 committed by Ben Skeggs
parent 380b1cadb0
commit 32dd7f2329
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/nouveau/nvkm/subdev/bios/volt.c
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@ -142,7 +142,10 @@ nvbios_volt_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
info->vid = nvbios_rd08(bios, volt + 0x01) >> 2;
break;
case 0x40:
break;
case 0x50:
info->voltage = nvbios_rd32(bios, volt) & 0x001fffff;
info->vid = (nvbios_rd32(bios, volt) >> 23) & 0xff;
break;
}
return volt;