ARM: 6722/1: SPEAr: sp810: switch to slow mode before reset

In sysctl_soft_reset(), switch to slow mode before resetting the system
via the system controller.  This is required.
Reviewed-by: NStanley Miao <stanley.miao@windriver.com>
Signed-off-by: NShiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/hardware/sp810.h

@@ -58,6 +58,9 @@
 
 static inline void sysctl_soft_reset(void __iomem *base)
 {
+	/* switch to slow mode */
+	writel(0x2, base + SCCTRL);
+
 	/* writing any value to SCSYSSTAT reg will reset system */
 	writel(0, base + SCSYSSTAT);
 }