[PATCH] i2c: imx-lpi2c: use dmaengine_get_dma_device() for DMA mapping

[Peng Fan (OSS)]

From: Peng Fan <peng.fan@xxxxxxx>

Replace all chan->device->dev references with
dmaengine_get_dma_device(chan) so that DMA mapping goes through the
correct device when the DMA controller has per-channel IOMMU domains
(chan_dma_dev=true). Without this, DMA map/unmap bypasses the IOMMU
context configured by the eDMA driver.

Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 49aabef7f115c..60547006f8b44 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -780,7 +780,7 @@ static void lpi2c_dma_unmap(struct lpi2c_imx_dma *dma)
 	struct dma_chan *chan = dma->dma_data_dir == DMA_FROM_DEVICE
 				? dma->chan_rx : dma->chan_tx;
 
-	dma_unmap_single(chan->device->dev, dma->dma_addr,
+	dma_unmap_single(dmaengine_get_dma_device(chan), dma->dma_addr,
 			 dma->dma_len, dma->dma_data_dir);
 
 	dma->dma_data_dir = DMA_NONE;
@@ -789,7 +789,7 @@ static void lpi2c_dma_unmap(struct lpi2c_imx_dma *dma)
 static void lpi2c_cleanup_rx_cmd_dma(struct lpi2c_imx_dma *dma)
 {
 	dmaengine_terminate_sync(dma->chan_tx);
-	dma_unmap_single(dma->chan_tx->device->dev, dma->dma_tx_addr,
+	dma_unmap_single(dmaengine_get_dma_device(dma->chan_tx), dma->dma_tx_addr,
 			 dma->rx_cmd_buf_len, DMA_TO_DEVICE);
 }
 
@@ -817,10 +817,10 @@ static int lpi2c_dma_rx_cmd_submit(struct lpi2c_imx_struct *lpi2c_imx)
 	struct dma_chan *txchan = dma->chan_tx;
 	dma_cookie_t cookie;
 
-	dma->dma_tx_addr = dma_map_single(txchan->device->dev,
+	dma->dma_tx_addr = dma_map_single(dmaengine_get_dma_device(txchan),
 					  dma->rx_cmd_buf, dma->rx_cmd_buf_len,
 					  DMA_TO_DEVICE);
-	if (dma_mapping_error(txchan->device->dev, dma->dma_tx_addr)) {
+	if (dma_mapping_error(dmaengine_get_dma_device(txchan), dma->dma_tx_addr)) {
 		dev_err(&lpi2c_imx->adapter.dev, "DMA map failed, use pio\n");
 		return -EINVAL;
 	}
@@ -844,12 +844,12 @@ static int lpi2c_dma_rx_cmd_submit(struct lpi2c_imx_struct *lpi2c_imx)
 	return 0;
 
 desc_prepare_err_exit:
-	dma_unmap_single(txchan->device->dev, dma->dma_tx_addr,
+	dma_unmap_single(dmaengine_get_dma_device(txchan), dma->dma_tx_addr,
 			 dma->rx_cmd_buf_len, DMA_TO_DEVICE);
 	return -EINVAL;
 
 submit_err_exit:
-	dma_unmap_single(txchan->device->dev, dma->dma_tx_addr,
+	dma_unmap_single(dmaengine_get_dma_device(txchan), dma->dma_tx_addr,
 			 dma->rx_cmd_buf_len, DMA_TO_DEVICE);
 	dmaengine_desc_free(rx_cmd_desc);
 	return -EINVAL;
@@ -872,9 +872,9 @@ static int lpi2c_dma_submit(struct lpi2c_imx_struct *lpi2c_imx)
 		dma->dma_transfer_dir = DMA_MEM_TO_DEV;
 	}
 
-	dma->dma_addr = dma_map_single(chan->device->dev,
+	dma->dma_addr = dma_map_single(dmaengine_get_dma_device(chan),
 				       dma->dma_buf, dma->dma_len, dma->dma_data_dir);
-	if (dma_mapping_error(chan->device->dev, dma->dma_addr)) {
+	if (dma_mapping_error(dmaengine_get_dma_device(chan), dma->dma_addr)) {
 		dev_err(&lpi2c_imx->adapter.dev, "DMA map failed, use pio\n");
 		return -EINVAL;
 	}
@@ -1085,7 +1085,7 @@ static int lpi2c_imx_dma_xfer(struct lpi2c_imx_struct *lpi2c_imx,
 	}
 
 	if (dma->dma_msg_flag & I2C_M_RD)
-		dma_unmap_single(dma->chan_tx->device->dev, dma->dma_tx_addr,
+		dma_unmap_single(dmaengine_get_dma_device(dma->chan_tx), dma->dma_tx_addr,
 				 dma->rx_cmd_buf_len, DMA_TO_DEVICE);
 	lpi2c_dma_unmap(dma);
 

---
base-commit: e6e35979777d646fe3c7c94dca7dd32fb25d45f4
change-id: 20260916-i2c-dma-e9cd42e4e7ff

Best regards,
--  
Peng Fan <peng.fan@xxxxxxx>