From: Qipan Li <Qipan.Li@csr.com>
Date: Thu, 20 Nov 2014 14:33:07 +0000 (+0800)
Subject: spi: sirf: reset SPI controller in init stage
X-Git-Tag: firefly_0821_release~176^2~2723^2~1^6
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8509c55fcb5192b7f70ec596a8752c2ec39942e3;p=firefly-linux-kernel-4.4.55.git

spi: sirf: reset SPI controller in init stage

in SPI boot mode, romcode uses SPI controller to fetch data from NOR
flash. Here we need to reset the hardware IP to restore its state.

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c
index bf3c6bc77530..0a96a65f580f 100644
--- a/drivers/spi/spi-sirf.c
+++ b/drivers/spi/spi-sirf.c
@@ -23,6 +23,7 @@
 #include <linux/dmaengine.h>
 #include <linux/dma-direction.h>
 #include <linux/dma-mapping.h>
+#include <linux/reset.h>
 
 #define DRIVER_NAME "sirfsoc_spi"
 
@@ -647,6 +648,12 @@ static int spi_sirfsoc_probe(struct platform_device *pdev)
 	int irq;
 	int i, ret;
 
+	ret = device_reset(&pdev->dev);
+	if (ret) {
+		dev_err(&pdev->dev, "SPI reset failed!\n");
+		return ret;
+	}
+
 	master = spi_alloc_master(&pdev->dev, sizeof(*sspi));
 	if (!master) {
 		dev_err(&pdev->dev, "Unable to allocate SPI master\n");