openwrt/target/linux/starfive/patches-6.6/1003-dmaengine-dw-axi-dmac-Handle-xfer-start-while-non-id.patch

From 2d5b71006c6a93e26eb86b7efd37440c020bab46 Mon Sep 17 00:00:00 2001
From: Samin Guo <samin.guo@starfivetech.com>
Date: Wed, 17 Nov 2021 14:50:45 +0800
Subject: [PATCH 1003/1024] dmaengine: dw-axi-dmac: Handle xfer start while
 non-idle

Signed-off-by: Samin Guo <samin.guo@starfivetech.com>
Signed-off-by: Curry Zhang <curry.zhang@starfivetech.com>
---
 drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 12 +++++++++++-
 drivers/dma/dw-axi-dmac/dw-axi-dmac.h          |  1 +
 2 files changed, 12 insertions(+), 1 deletion(-)

--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
@@ -382,11 +382,13 @@ static void axi_chan_block_xfer_start(st
 	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);
@@ -1028,6 +1030,14 @@ static noinline void axi_chan_handle_err
 			axi_chan_name(chan));
 		goto out;
 	}
+	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);
 
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
@@ -50,6 +50,7 @@ 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;
 };