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mmc: bcm2835: 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>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/20191217122254.7103-1-peter.ujfalusi@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Peter Ujfalusi 2019-12-17 14:22:54 +02:00 committed by Ulf Hansson
parent e6d82a7bc8
commit 738987a1d6
1 changed files with 11 additions and 1 deletions
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12
drivers/mmc/host/bcm2835.c
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@ -1393,7 +1393,17 @@ static int bcm2835_probe(struct platform_device *pdev)
host->dma_chan = NULL; host->dma_chan = NULL;
host->dma_desc = NULL; host->dma_desc = NULL;
host->dma_chan_rxtx = dma_request_slave_channel(dev, "rx-tx"); host->dma_chan_rxtx = dma_request_chan(dev, "rx-tx");
if (IS_ERR(host->dma_chan_rxtx)) {
ret = PTR_ERR(host->dma_chan_rxtx);
host->dma_chan_rxtx = NULL;
if (ret == -EPROBE_DEFER)
goto err;
/* Ignore errors to fall back to PIO mode */
}
clk = devm_clk_get(dev, NULL); clk = devm_clk_get(dev, NULL);
if (IS_ERR(clk)) { if (IS_ERR(clk)) {