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mtd: rawnand: stm32_fmc2: Use dma_request_chan() instead dma_request_slave_channel()

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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@ti.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200227123749.24064-8-peter.ujfalusi@ti.com
This commit is contained in:
Peter Ujfalusi 2020-02-27 14:37:49 +02:00 committed by Miquel Raynal
parent 92f0f8efbd
commit b35f79aa46
1 changed files with 37 additions and 7 deletions
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44
drivers/mtd/nand/raw/stm32_fmc2_nand.c
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@ -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 */