[PATCH] drm/nouveau/kms/nv140-: Disable interlacing

[Karol Herbst]

On Tue, Aug 16, 2022 at 8:04 PM Lyude Paul <lyude at redhat.com> wrote:
>
> As it turns out: while Nvidia does actually have interlacing knobs on their
> GPU still pretty much no current GPUs since Volta actually support it.
> Trying interlacing on these GPUs will result in NVDisplay being quite
> unhappy like so:
>
> nouveau 0000:1f:00.0: disp: chid 0 stat 00004802 reason 4 [INVALID_ARG] mthd 2008 data 00000001 code 00080000
> nouveau 0000:1f:00.0: disp: chid 0 stat 10005080 reason 5 [INVALID_STATE] mthd 0200 data 00000001 code 00000001
>
> So let's fix this by following the same behavior Nvidia's driver does and
> disable interlacing entirely.
>
> Signed-off-by: Lyude Paul <lyude at redhat.com>
> Cc: stable at vger.kernel.org
> ---
>  drivers/gpu/drm/nouveau/nouveau_connector.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
> index 43a9d1e1cf71..8100c75ee731 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_connector.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
> @@ -504,7 +504,8 @@ nouveau_connector_set_encoder(struct drm_connector *connector,
>                         connector->interlace_allowed =
>                                 nv_encoder->caps.dp_interlace;
>                 else
> -                       connector->interlace_allowed = true;
> +                       connector->interlace_allowed =
> +                               drm->client.device.info.family < NV_DEVICE_INFO_V0_VOLTA;
>                 connector->doublescan_allowed = true;
>         } else
>         if (nv_encoder->dcb->type == DCB_OUTPUT_LVDS ||
> --
> 2.37.1
>

Reviewed-by: Karol Herbst <kherbst at redhat.com>