[PATCH] drm/udl: limit modes to the sku pixel limits.

[Alex Deucher]

On Tue, Sep 25, 2012 at 2:17 AM, Dave Airlie <airlied at gmail.com> wrote:
> From: Dave Airlie <airlied at redhat.com>
>
> Otherwise when X starts we commonly get a black screen scanning
> out nothing, its wierd dpms on/off from userspace brings it back,
>
> With this on F18, multi-seat works again with my 1920x1200 monitor
> which is above the sku limit for the device I have.
>
> Cc: stable at vger.kernel.org
> Signed-off-by: Dave Airlie <airlied at redhat.com>

I'm not familiar with the hw, but looks reasonable.

Reviewed-by: Alex Deucher <alexander.deucher at gmail.com>

> ---
>  drivers/gpu/drm/udl/udl_connector.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c
> index ba055e9..8d9dc44 100644
> --- a/drivers/gpu/drm/udl/udl_connector.c
> +++ b/drivers/gpu/drm/udl/udl_connector.c
> @@ -69,6 +69,13 @@ static int udl_get_modes(struct drm_connector *connector)
>  static int udl_mode_valid(struct drm_connector *connector,
>                           struct drm_display_mode *mode)
>  {
> +       struct udl_device *udl = connector->dev->dev_private;
> +       if (!udl->sku_pixel_limit)
> +               return 0;
> +
> +       if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
> +               return MODE_VIRTUAL_Y;
> +
>         return 0;
>  }
>
> --
> 1.7.12
>
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