From: Rabin Vincent <rabin.vincent@axis.com>
Date: Mon, 23 Nov 2015 07:13:45 +0000 (+0100)
Subject: spi: pl022: handle EPROBE_DEFER for dma
X-Git-Tag: firefly_0821_release~176^2~611^2^5
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f3d4bb3342630cd3d89882586851498d8dc7c0f2;p=firefly-linux-kernel-4.4.55.git

spi: pl022: handle EPROBE_DEFER for dma

Handle EPROBE_DEFER explicitly so that we ensure that we get the DMA
channel specified in the device tree, instead of depending on the DMA
controller getting probed before us.

Signed-off-by: Rabin Vincent <rabin.vincent@axis.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 94af80676684..5e5fd77e2711 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -1171,19 +1171,31 @@ err_no_rxchan:
 static int pl022_dma_autoprobe(struct pl022 *pl022)
 {
 	struct device *dev = &pl022->adev->dev;
+	struct dma_chan *chan;
+	int err;
 
 	/* automatically configure DMA channels from platform, normally using DT */
-	pl022->dma_rx_channel = dma_request_slave_channel(dev, "rx");
-	if (!pl022->dma_rx_channel)
+	chan = dma_request_slave_channel_reason(dev, "rx");
+	if (IS_ERR(chan)) {
+		err = PTR_ERR(chan);
 		goto err_no_rxchan;
+	}
+
+	pl022->dma_rx_channel = chan;
 
-	pl022->dma_tx_channel = dma_request_slave_channel(dev, "tx");
-	if (!pl022->dma_tx_channel)
+	chan = dma_request_slave_channel_reason(dev, "tx");
+	if (IS_ERR(chan)) {
+		err = PTR_ERR(chan);
 		goto err_no_txchan;
+	}
+
+	pl022->dma_tx_channel = chan;
 
 	pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	if (!pl022->dummypage)
+	if (!pl022->dummypage) {
+		err = -ENOMEM;
 		goto err_no_dummypage;
+	}
 
 	return 0;
 
@@ -1194,7 +1206,7 @@ err_no_txchan:
 	dma_release_channel(pl022->dma_rx_channel);
 	pl022->dma_rx_channel = NULL;
 err_no_rxchan:
-	return -ENODEV;
+	return err;
 }
 		
 static void terminate_dma(struct pl022 *pl022)
@@ -2236,6 +2248,10 @@ static int pl022_probe(struct amba_device *adev, const struct amba_id *id)
 
 	/* Get DMA channels, try autoconfiguration first */
 	status = pl022_dma_autoprobe(pl022);
+	if (status == -EPROBE_DEFER) {
+		dev_dbg(dev, "deferring probe to get DMA channel\n");
+		goto err_no_irq;
+	}
 
 	/* If that failed, use channels from platform_info */
 	if (status == 0)