int dss_check_overlay(struct omap_overlay *ovl, struct omap_dss_device *dssdev)
{
	struct omap_overlay_info *info;
	u16 outw, outh;
	u16 dw, dh;

	if (!dssdev)
		return 0;

	if (!ovl->info.enabled)
		return 0;

	info = &ovl->info;

	if (info->paddr == 0) {
		DSSERR("check_overlay failed: paddr 0\n");
		return -EINVAL;
	}

	dssdev->driver->get_resolution(dssdev, &dw, &dh);

	/* y resolution to be doubled in case of interlaced HDMI */
	if ((ovl->info.field == IBUF_IDEV) || (ovl->info.field == PBUF_IDEV))
		dh *= 2;

	DSSDBG("check_overlay %d: (%d,%d %dx%d -> %dx%d) disp (%dx%d)\n",
			ovl->id,
			info->pos_x, info->pos_y,
			info->width, info->height,
			info->out_width, info->out_height,
			dw, dh);