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mmc: mxcmmc: 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/20191217112803.31161-1-peter.ujfalusi@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Peter Ujfalusi 2019-12-17 13:28:03 +02:00 committed by Ulf Hansson
parent 716d0205fe
commit c3b2a0212b
1 changed files with 10 additions and 1 deletions
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11
drivers/mmc/host/mxcmmc.c
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@ -1121,7 +1121,16 @@ static int mxcmci_probe(struct platform_device *pdev)
mxcmci_writel(host, host->default_irq_mask, MMC_REG_INT_CNTR);
if (!host->pdata) {
host->dma = dma_request_slave_channel(&pdev->dev, "rx-tx");
host->dma = dma_request_chan(&pdev->dev, "rx-tx");
if (IS_ERR(host->dma)) {
if (PTR_ERR(host->dma) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto out_clk_put;
}
/* Ignore errors to fall back to PIO mode */
host->dma = NULL;
}
} else {
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (res) {