[Nouveau] [PATCH] drm/nouveau/therm/gp100: Do not report temperature when subdev is shadowed

[Karol Herbst]

no, we can't do that. We actually have to prevent this from hwom. The
issue here is, that the reg read returns 0xffffffff and parsing that
is the first step in the first place.

On Thu, Jan 25, 2018 at 7:16 PM, Tobias Klausmann
<tobias.johannes.klausmann at mni.thm.de> wrote:
> This fixes wrong temperature outputs e.g. 511°C if the card is asleep.
>
> Signed-off-by: Tobias Klausmann <tobias.johannes.klausmann at mni.thm.de>
> ---
>  drivers/gpu/drm/nouveau/nvkm/subdev/therm/gp100.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gp100.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gp100.c
> index 9f0dea3f61dc..45d0ec632b5a 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gp100.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/gp100.c
> @@ -32,8 +32,10 @@ gp100_temp_get(struct nvkm_therm *therm)
>         u32 inttemp = (tsensor & 0x0001fff8);
>
>         /* device SHADOWed */
> -       if (tsensor & 0x40000000)
> +       if (tsensor & 0x40000000) {
>                 nvkm_trace(subdev, "reading temperature from SHADOWed sensor\n");
> +               return -ENODEV;
> +       }
>
>         /* device valid */
>         if (tsensor & 0x20000000)
> --
> 2.16.1
>
> _______________________________________________
> Nouveau mailing list
> Nouveau at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/nouveau