| Message ID | 20200227123749.24064-5-peter.ujfalusi@ti.com (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | ac80c55b46754fbe0394cf404a9091b551f00e22 |
| Headers | show |
| Series | mtd: rawnand: Convert drivers to use dma_request_chan() | expand |
On Thu, Feb 27, 2020 at 02:37:46PM +0200, Peter Ujfalusi wrote: > 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> Acked-by: Maxime Ripard <mripard@kernel.org> Thanks! Maxime
On Thu, 2020-02-27 at 12:37:46 UTC, Peter Ujfalusi wrote: > 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> > Acked-by: Maxime Ripard <mripard@kernel.org> Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks. Miquel
diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c index 37a4ac0dd85b..3a24c4512af7 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);
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> --- drivers/mtd/nand/raw/sunxi_nand.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-)