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>
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) {