[Nouveau] [PATCH 01/19] bios/volt: handle voltage table version 0x50 with 0ed header

[Karol Herbst]

Some Fermi+ gpus have no usefull header in the voltage table, which means
nouveau has to read the voltages out of the entries directly.

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

Signed-off-by: Karol Herbst <nouveau at karolherbst.de>
Reviewed-by: Martin Peres <martin.peres at free.fr>
---
 drm/nouveau/nvkm/subdev/bios/volt.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drm/nouveau/nvkm/subdev/bios/volt.c b/drm/nouveau/nvkm/subdev/bios/volt.c
index 6e0a336..81a47b2 100644
--- a/drm/nouveau/nvkm/subdev/bios/volt.c
+++ b/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;
-- 
2.7.3