dmaengine: dw-axi-dmac: Handle xfer start while non-idle

Signed-off-by: Samin Guo <[email protected]>
Signed-off-by: Curry Zhang <[email protected]>

drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c

@@ -377,11 +377,13 @@ static void axi_chan_block_xfer_start(struct axi_dma_chan *chan,
 	u32 irq_mask;
 	u8 lms = 0; /* Select AXI0 master for LLI fetching */
 
+	chan->is_err = false;
 	if (unlikely(axi_chan_is_hw_enable(chan))) {
 		dev_err(chan2dev(chan), "%s is non-idle!\n",
 			axi_chan_name(chan));
 
-		return;
+		axi_chan_disable(chan);
+		chan->is_err = true;
 	}
 
 	axi_dma_enable(chan->chip);
@@ -1013,6 +1015,14 @@ static noinline void axi_chan_handle_err(struct axi_dma_chan *chan, u32 status)
 
 	/* The bad descriptor currently is in the head of vc list */
 	vd = vchan_next_desc(&chan->vc);
+	if (chan->is_err) {
+		struct axi_dma_desc *desc = vd_to_axi_desc(vd);
+
+		axi_chan_block_xfer_start(chan, desc);
+		chan->is_err = false;
+		goto out;
+	}
+
 	/* Remove the completed descriptor from issued list */
 	list_del(&vd->node);
 
@@ -1027,6 +1037,7 @@ static noinline void axi_chan_handle_err(struct axi_dma_chan *chan, u32 status)
 	/* Try to restart the controller */
 	axi_chan_start_first_queued(chan);
 
+out:
 	spin_unlock_irqrestore(&chan->vc.lock, flags);
 }
 

drivers/dma/dw-axi-dmac/dw-axi-dmac.h

@@ -49,6 +49,7 @@ struct axi_dma_chan {
 	struct dma_slave_config		config;
 	enum dma_transfer_direction	direction;
 	bool				cyclic;
+	bool 				is_err;
 	/* these other elements are all protected by vc.lock */
 	bool				is_paused;
 };