linux-kernel - [PATCH 4/9] spi: img-spfi: Use dma_request_chan() instead dma_request_slave

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Date:   Thu, 12 Dec 2019 15:55:45 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <broonie@...nel.org>, <nsaenzjulienne@...e.de>,
        <f.fainelli@...il.com>, <rjui@...adcom.com>,
        <sbranden@...adcom.com>, <shawnguo@...nel.org>,
        <s.hauer@...gutronix.de>, <baohua@...nel.org>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>
CC:     <vkoul@...nel.org>, <linux-spi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-rpi-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: [PATCH 4/9] spi: img-spfi: 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 <peter.ujfalusi@...com>
---
 drivers/spi/spi-img-spfi.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c
index f4a8f470aecc..8543f5ed1099 100644
--- a/drivers/spi/spi-img-spfi.c
+++ b/drivers/spi/spi-img-spfi.c
@@ -666,8 +666,22 @@ static int img_spfi_probe(struct platform_device *pdev)
 	master->unprepare_message = img_spfi_unprepare;
 	master->handle_err = img_spfi_handle_err;
 
-	spfi->tx_ch = dma_request_slave_channel(spfi->dev, "tx");
-	spfi->rx_ch = dma_request_slave_channel(spfi->dev, "rx");
+	spfi->tx_ch = dma_request_chan(spfi->dev, "tx");
+	if (IS_ERR(spfi->tx_ch)) {
+		ret = PTR_ERR(spfi->tx_ch);
+		spfi->tx_ch = NULL;
+		if (ret == -EPROBE_DEFER)
+			goto disable_pm;
+	}
+
+	spfi->rx_ch = dma_request_chan(spfi->dev, "rx");
+	if (IS_ERR(spfi->rx_ch)) {
+		ret = PTR_ERR(spfi->rx_ch);
+		spfi->rx_ch = NULL;
+		if (ret == -EPROBE_DEFER)
+			goto disable_pm;
+	}
+
 	if (!spfi->tx_ch || !spfi->rx_ch) {
 		if (spfi->tx_ch)
 			dma_release_channel(spfi->tx_ch);
-- 
Peter

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