gpu: ipu-v3: only set non-zero AXI ID for IC when PRG is absent

Using non-zero AXI IDs for anything other than the display channels
collides with the PRG AXI snooping, so only do this if there is no
PRG present.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/ipu-v3/ipu-image-convert.c

@@ -671,7 +671,12 @@ static void init_idmac_channel(struct ipu_image_convert_ctx *ctx,
 	ipu_ic_task_idma_init(chan->ic, channel, width, height,
 			      burst_size, rot_mode);
 
-	ipu_cpmem_set_axi_id(channel, 1);
+	/*
+	 * Setting a non-zero AXI ID collides with the PRG AXI snooping, so
+	 * only do this when there is no PRG present.
+	 */
+	if (!channel->ipu->prg_priv)
+		ipu_cpmem_set_axi_id(channel, 1);
 
 	ipu_idmac_set_double_buffer(channel, ctx->double_buffering);
 }