From 738987a1d6f167e155c41658211f8c98c114c371 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Tue, 17 Dec 2019 14:22:54 +0200 Subject: [PATCH] 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 Reviewed-by: Nicolas Saenz Julienne Link: https://lore.kernel.org/r/20191217122254.7103-1-peter.ujfalusi@ti.com Signed-off-by: Ulf Hansson --- drivers/mmc/host/bcm2835.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c index 99f61fd..c3d9498 100644 --- a/drivers/mmc/host/bcm2835.c +++ b/drivers/mmc/host/bcm2835.c @@ -1393,7 +1393,17 @@ 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)) { + 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); if (IS_ERR(clk)) { -- 2.7.4