diff options
| author | Karol Herbst <karolherbst@gmail.com> | 2016-07-12 21:36:08 +0200 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2016-10-12 17:29:19 +1000 |
| commit | 32dd7f2329765f428a824d91819bb8db7af432c5 (patch) | |
| tree | 59602c064bcc9499414fb5e38f72b42e3ef87309 /drivers/gpu/drm/nouveau | |
| parent | 380b1cadb0ef26165ba4b15fcf1bd2f1d82d0c29 (diff) | |
| download | lwn-32dd7f2329765f428a824d91819bb8db7af432c5.tar.gz lwn-32dd7f2329765f428a824d91819bb8db7af432c5.zip | |
drm/nouveau/bios/volt: Handle voltage table version 0x50 with zeroed header
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>
Diffstat (limited to 'drivers/gpu/drm/nouveau')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/bios/volt.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/volt.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/volt.c index 6e0a33648be9..81a47b22617a 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/volt.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/volt.c @@ -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; |