From ac80c55b46754fbe0394cf404a9091b551f00e22 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Thu, 27 Feb 2020 14:37:46 +0200 Subject: [PATCH] mtd: rawnand: sunxi: 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 Acked-by: Maxime Ripard Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20200227123749.24064-5-peter.ujfalusi@ti.com --- drivers/mtd/nand/raw/sunxi_nand.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c index 6ede3934a5f4a..5f3e40b79fb16 100644 --- a/drivers/mtd/nand/raw/sunxi_nand.c +++ b/drivers/mtd/nand/raw/sunxi_nand.c @@ -2123,8 +2123,16 @@ static int sunxi_nfc_probe(struct platform_device *pdev) if (ret) goto out_ahb_reset_reassert; - nfc->dmac = dma_request_slave_channel(dev, "rxtx"); - if (nfc->dmac) { + nfc->dmac = dma_request_chan(dev, "rxtx"); + if (IS_ERR(nfc->dmac)) { + ret = PTR_ERR(nfc->dmac); + if (ret == -EPROBE_DEFER) + goto out_ahb_reset_reassert; + + /* Ignore errors to fall back to PIO mode */ + dev_warn(dev, "failed to request rxtx DMA channel: %d\n", ret); + nfc->dmac = NULL; + } else { struct dma_slave_config dmac_cfg = { }; dmac_cfg.src_addr = r->start + nfc->caps->reg_io_data; @@ -2138,9 +2146,6 @@ static int sunxi_nfc_probe(struct platform_device *pdev) if (nfc->caps->extra_mbus_conf) writel(readl(nfc->regs + NFC_REG_CTL) | NFC_DMA_TYPE_NORMAL, nfc->regs + NFC_REG_CTL); - - } else { - dev_warn(dev, "failed to request rxtx DMA channel\n"); } platform_set_drvdata(pdev, nfc); -- 2.30.2