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spi: stm32: 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.

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/20191212135550.4634-10-peter.ujfalusi@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
alistair/sensors
Peter Ujfalusi 2019-12-12 15:55:50 +02:00 committed by Mark Brown
parent 658606ff4c
commit 0a454258fe
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 24 additions and 12 deletions
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36
drivers/spi/spi-stm32.c
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@ -1879,17 +1879,29 @@ static int stm32_spi_probe(struct platform_device *pdev)
master->transfer_one = stm32_spi_transfer_one;
master->unprepare_message = stm32_spi_unprepare_msg;
spi->dma_tx = dma_request_slave_channel(spi->dev, "tx");
if (!spi->dma_tx)
dev_warn(&pdev->dev, "failed to request tx dma channel\n");
else
master->dma_tx = spi->dma_tx;
spi->dma_tx = dma_request_chan(spi->dev, "tx");
if (IS_ERR(spi->dma_tx)) {
ret = PTR_ERR(spi->dma_tx);
spi->dma_tx = NULL;
if (ret == -EPROBE_DEFER)
goto err_clk_disable;
dev_warn(&pdev->dev, "failed to request tx dma channel\n");
} else {
master->dma_tx = spi->dma_tx;
}
spi->dma_rx = dma_request_chan(spi->dev, "rx");
if (IS_ERR(spi->dma_rx)) {
ret = PTR_ERR(spi->dma_rx);
spi->dma_rx = NULL;
if (ret == -EPROBE_DEFER)
goto err_dma_release;
spi->dma_rx = dma_request_slave_channel(spi->dev, "rx");
if (!spi->dma_rx)
dev_warn(&pdev->dev, "failed to request rx dma channel\n");
else
} else {
master->dma_rx = spi->dma_rx;
}
if (spi->dma_tx || spi->dma_rx)
master->can_dma = stm32_spi_can_dma;
@ -1901,26 +1913,26 @@ static int stm32_spi_probe(struct platform_device *pdev)
if (ret) {
dev_err(&pdev->dev, "spi master registration failed: %d\n",
ret);
goto err_dma_release;
goto err_pm_disable;
}
if (!master->cs_gpiods) {
dev_err(&pdev->dev, "no CS gpios available\n");
ret = -EINVAL;
goto err_dma_release;
goto err_pm_disable;
}
dev_info(&pdev->dev, "driver initialized\n");
return 0;
err_pm_disable:
pm_runtime_disable(&pdev->dev);
err_dma_release:
if (spi->dma_tx)
dma_release_channel(spi->dma_tx);
if (spi->dma_rx)
dma_release_channel(spi->dma_rx);
pm_runtime_disable(&pdev->dev);
err_clk_disable:
clk_disable_unprepare(spi->clk);
err_master_put: