[PATCH 2/3] drm: rcar-du: Reject planes located fully off-screen

[Kieran Bingham]

Hi Laurent,

Thankyou for the patch,

This looks good, and passes the tests.

On 16/08/17 00:03, Laurent Pinchart wrote:
> There is no point in accepting fully off-screen planes as they won't be
> displayed. Reject them in the atomic check.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>

Reviewed-by: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>

> ---
>  drivers/gpu/drm/rcar-du/rcar_du_plane.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.c b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> index 4f076c364f25..714e02960635 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> @@ -569,6 +569,8 @@ int __rcar_du_plane_atomic_check(struct drm_plane *plane,
>  				 struct drm_plane_state *state,
>  				 const struct rcar_du_format_info **format)
>  {
> +	const struct drm_display_mode *mode;
> +	struct drm_crtc_state *crtc_state;
>  	struct drm_device *dev = plane->dev;
>  
>  	if (!state->fb || !state->crtc) {
> @@ -582,6 +584,20 @@ int __rcar_du_plane_atomic_check(struct drm_plane *plane,
>  		return -EINVAL;
>  	}
>  
> +	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
> +	if (IS_ERR(crtc_state))
> +		return PTR_ERR(crtc_state);
> +
> +	mode = &crtc_state->adjusted_mode;
> +	if (state->crtc_x >= mode->hdisplay ||
> +	    state->crtc_y >= mode->vdisplay ||
> +	    state->crtc_x + (int)state->crtc_w <= 0 ||
> +	    state->crtc_y + (int)state->crtc_h <= 0) {
> +		dev_dbg(dev->dev, "%s: plane can't be fully off-screen\n",
> +			__func__);
> +		return -EINVAL;
> +	}
> +
>  	*format = rcar_du_format_info(state->fb->format->format);
>  	if (*format == NULL) {
>  		dev_dbg(dev->dev, "%s: unsupported format %08x\n", __func__,
>