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@xxxxxx> --- drivers/mmc/host/bcm2835.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c index 99f61fd2a658..3821f159d36d 100644 --- a/drivers/mmc/host/bcm2835.c +++ b/drivers/mmc/host/bcm2835.c @@ -1393,7 +1393,15 @@ static int bcm2835_probe(struct platform_device *pdev) host->dma_chan = 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)) { + if (PTR_ERR(host->dma_chan_rxtx) == -EPROBE_DEFER) + return -EPROBE_DEFER; + + /* Ignore errors to fall back to PIO mode */ + host->dma_chan_rxtx = NULL; + } + clk = devm_clk_get(dev, NULL); if (IS_ERR(clk)) { -- Peter Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki