diff mbox series

[4/7] mtd: rawnand: sunxi: Use dma_request_chan() instead dma_request_slave_channel()

Message ID 20200227123749.24064-5-peter.ujfalusi@ti.com
State New
Headers show
Series mtd: rawnand: Convert drivers to use dma_request_chan() | expand

Commit Message

Peter Ujfalusi Feb. 27, 2020, 12:37 p.m. UTC 
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(-)

-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki


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Comments

Maxime Ripard March 9, 2020, 9:58 a.m. UTC | #1 
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
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Miquel Raynal March 10, 2020, 6:30 p.m. UTC | #2 
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

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diff mbox series

Patch

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);