w1: mxc_w1: Perform a software reset at startup

This patch adds a software reset for 1-Wire module at driver startup.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/w1/masters/mxc_w1.c b/drivers/w1/masters/mxc_w1.c
index 0d05abe34362..741d2bb400ae 100644
--- a/drivers/w1/masters/mxc_w1.c
+++ b/drivers/w1/masters/mxc_w1.c
@@ -32,6 +32,7 @@
 # define MXC_W1_CONTROL_RPP     BIT(7)
 #define MXC_W1_TIME_DIVIDER     0x02
 #define MXC_W1_RESET            0x04
+# define MXC_W1_RESET_RST       BIT(0)
 
 struct mxc_w1_device {
         void __iomem *regs;
@@ -129,6 +130,10 @@ static int mxc_w1_probe(struct platform_device *pdev)
         if (err)
                 return err;
 
+        /* Software reset 1-Wire module */
+        writeb(MXC_W1_RESET_RST, mdev->regs + MXC_W1_RESET);
+        writeb(0, mdev->regs + MXC_W1_RESET);
+
         writeb(clkdiv - 1, mdev->regs + MXC_W1_TIME_DIVIDER);
 
         mdev->bus_master.data = mdev;