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 bf3c6bc7753088a5a9bd79b567bc0cee5c9921b6..0a96a65f580fbe82ccf1f8b3bd99924de425230e 100644 (file)
--- 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");