linux-kernel - [PATCH 7/7] mtd: rawnand: stm32_fmc2: Use dma_request_chan() instead dma_request_slave

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Date:   Thu, 27 Feb 2020 14:37:49 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <vigneshr@...com>, <miquel.raynal@...tlin.com>, <han.xu@....com>,
        <richard@....at>, <mripard@...nel.org>, <wens@...e.org>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <vkoul@...nel.org>
Subject: [PATCH 7/7] mtd: rawnand: stm32_fmc2: Use dma_request_chan() instead dma_request_slave_channel()

dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.

Use using dma_request_chan() directly and inform user of error in case the
DMA request failed.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/mtd/nand/raw/stm32_fmc2_nand.c | 44 ++++++++++++++++++++++----
 1 file changed, 37 insertions(+), 7 deletions(-)

diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
index 3ba73f18841f..b6d45cd911ae 100644
--- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
+++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
@@ -1606,15 +1606,36 @@ static int stm32_fmc2_setup_interface(struct nand_chip *chip, int chipnr,
 /* DMA configuration */
 static int stm32_fmc2_dma_setup(struct stm32_fmc2_nfc *fmc2)
 {
-	int ret;
+	int ret = 0;
 
-	fmc2->dma_tx_ch = dma_request_slave_channel(fmc2->dev, "tx");
-	fmc2->dma_rx_ch = dma_request_slave_channel(fmc2->dev, "rx");
-	fmc2->dma_ecc_ch = dma_request_slave_channel(fmc2->dev, "ecc");
+	fmc2->dma_tx_ch = dma_request_chan(fmc2->dev, "tx");
+	if (IS_ERR(fmc2->dma_tx_ch)) {
+		ret = PTR_ERR(fmc2->dma_tx_ch);
+		if (ret != -ENODEV)
+			dev_err(fmc2->dev,
+				"failed to request tx DMA channel: %d\n", ret);
+		fmc2->dma_tx_ch = NULL;
+		goto err_dma;
+	}
 
-	if (!fmc2->dma_tx_ch || !fmc2->dma_rx_ch || !fmc2->dma_ecc_ch) {
-		dev_warn(fmc2->dev, "DMAs not defined in the device tree, polling mode is used\n");
-		return 0;
+	fmc2->dma_rx_ch = dma_request_chan(fmc2->dev, "rx");
+	if (IS_ERR(fmc2->dma_rx_ch)) {
+		ret = PTR_ERR(fmc2->dma_rx_ch);
+		if (ret != -ENODEV)
+			dev_err(fmc2->dev,
+				"failed to request rx DMA channel: %d\n", ret);
+		fmc2->dma_rx_ch = NULL;
+		goto err_dma;
+	}
+
+	fmc2->dma_ecc_ch = dma_request_chan(fmc2->dev, "ecc");
+	if (IS_ERR(fmc2->dma_ecc_ch)) {
+		ret = PTR_ERR(fmc2->dma_ecc_ch);
+		if (ret != -ENODEV)
+			dev_err(fmc2->dev,
+				"failed to request ecc DMA channel: %d\n", ret);
+		fmc2->dma_ecc_ch = NULL;
+		goto err_dma;
 	}
 
 	ret = sg_alloc_table(&fmc2->dma_ecc_sg, FMC2_MAX_SG, GFP_KERNEL);
@@ -1635,6 +1656,15 @@ static int stm32_fmc2_dma_setup(struct stm32_fmc2_nfc *fmc2)
 	init_completion(&fmc2->dma_ecc_complete);
 
 	return 0;
+
+err_dma:
+	if (ret == -ENODEV) {
+		dev_warn(fmc2->dev,
+			 "DMAs not defined in the DT, polling mode is used\n");
+		ret = 0;
+	}
+
+	return ret;
 }
 
 /* NAND callbacks setup */
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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