media: rockchip: rkcif: support get continuous memory from specific CMA region

If no IOMMU support for CIF, we prefer to alloc continuous
physical memory from our reserved CMA region than from system
reserved.

Change-Id: Icbe1f206593ffc10eba96e12f77f499455dbcd55
Signed-off-by: Zhong Yichong <zyc@rock-chips.com>

Author: YiChongZh

drivers/media/platform/rockchip/cif/dev.c

@@ -12,6 +12,7 @@
 #include <linux/of.h>
 #include <linux/of_graph.h>
 #include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/reset.h>
 #include <linux/pm_runtime.h>
 #include <linux/pinctrl/consumer.h>
@@ -486,8 +487,15 @@ static int rkcif_plat_probe(struct platform_device *pdev)
 		goto err_unreg_media_dev;
 
 	cif_dev->iommu_en = is_iommu_enable(dev);
-	if (cif_dev->iommu_en)
+	if (cif_dev->iommu_en) {
 		rkcif_iommu_init(cif_dev);
+	} else {
+		ret = of_reserved_mem_device_init(dev);
+		if (ret)
+			v4l2_warn(v4l2_dev,
+				  "No reserved memory region assign to CIF\n");
+	}
+
 	pm_runtime_enable(&pdev->dev);
 
 	return 0;