[Nouveau] [RFC PATCH 03/29] subdev/volt/gk104: return error when read fails

[Karol Herbst]

While my gpu was powered off, hwmon returned 0.6V as the current voltage.
If nvkm_rd32 fails for any reason, return the error.

With that sensors will display a "N/A" instead of 0.6V.

Signed-off-by: Karol Herbst <karolherbst at gmail.com>
---
 drm/nouveau/nvkm/subdev/volt/gk104.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drm/nouveau/nvkm/subdev/volt/gk104.c b/drm/nouveau/nvkm/subdev/volt/gk104.c
index 1c744e02..53a7af9d 100644
--- a/drm/nouveau/nvkm/subdev/volt/gk104.c
+++ b/drm/nouveau/nvkm/subdev/volt/gk104.c
@@ -40,10 +40,15 @@ gk104_volt_get(struct nvkm_volt *base)
 {
 	struct nvbios_volt *bios = &gk104_volt(base)->bios;
 	struct nvkm_device *device = base->subdev.device;
-	u32 div, duty;
+	int div, duty;
 
 	div  = nvkm_rd32(device, 0x20340);
+	if (div < 0)
+		return div;
+
 	duty = nvkm_rd32(device, 0x20344);
+	if (duty < 0)
+		return duty;
 
 	return bios->base + bios->pwm_range * duty / div;
 }
-- 
2.14.1