staging: vc04_services: vc-sm-cma: Explicitly set DMA mask

The platform model originally handled the DMA mask. Now that
we are on the vchiq_bus we need to explicitly set this.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

Author: kbingham

drivers/staging/vc04_services/vc-sm-cma/vc_sm.c

@@ -1477,8 +1477,17 @@ static void vc_sm_connected_init(void)
 /* Driver loading. */
 static int bcm2835_vc_sm_cma_probe(struct vchiq_device *device)
 {
+	int err;
+
 	pr_info("%s: Videocore shared memory driver\n", __func__);
 
+	err = dma_set_mask_and_coherent(&device->dev, DMA_BIT_MASK(32));
+	if (err) {
+		dev_err(&device->dev, "dma_set_mask_and_coherent failed: %d\n",
+			err);
+		return err;
+	}
+
 	sm_state = devm_kzalloc(&device->dev, sizeof(*sm_state), GFP_KERNEL);
 	if (!sm_state)
 		return -ENOMEM;