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spi: atmel: 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.

By using dma_request_chan() directly the driver can support deferred
probing against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20191212135550.4634-2-peter.ujfalusi@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Peter Ujfalusi 2019-12-12 15:55:42 +02:00 committed by Mark Brown
parent 851c902fd2
commit d947c9d26c
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GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 18 deletions
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29
drivers/spi/spi-atmel.c
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@ -514,26 +514,19 @@ static int atmel_spi_configure_dma(struct spi_master *master,
master->dma_tx = dma_request_chan(dev, "tx");
if (IS_ERR(master->dma_tx)) {
err = PTR_ERR(master->dma_tx);
if (err == -EPROBE_DEFER) {
dev_warn(dev, "no DMA channel available at the moment\n");
goto error_clear;
}
dev_err(dev,
"DMA TX channel not available, SPI unable to use DMA\n");
err = -EBUSY;
if (err != -EPROBE_DEFER)
dev_err(dev, "No TX DMA channel, DMA is disabled\n");
goto error_clear;
}
/*
* No reason to check EPROBE_DEFER here since we have already requested
* tx channel. If it fails here, it's for another reason.
*/
master->dma_rx = dma_request_slave_channel(dev, "rx");
if (!master->dma_rx) {
dev_err(dev,
"DMA RX channel not available, SPI unable to use DMA\n");
err = -EBUSY;
master->dma_rx = dma_request_chan(dev, "rx");
if (IS_ERR(master->dma_rx)) {
err = PTR_ERR(master->dma_rx);
/*
* No reason to check EPROBE_DEFER here since we have already
* requested tx channel.
*/
dev_err(dev, "No RX DMA channel, DMA is disabled\n");
goto error;
}
@ -548,7 +541,7 @@ static int atmel_spi_configure_dma(struct spi_master *master,
return 0;
error:
if (master->dma_rx)
if (!IS_ERR(master->dma_rx))
dma_release_channel(master->dma_rx);
if (!IS_ERR(master->dma_tx))
dma_release_channel(master->dma_tx);