davinci: enable forced transitions on PSC

Some DaVinci modules like the SATA on DA850
need forced module state transitions.

Define a "force" flag which can be passed to
the PSC config function to enable it to make
forced transitions.

Forced transitions shouldn't normally be attempted,
unless the TRM explicitly specifies its usage.

ChangeLog:
v2:
Modified to take care of the fact that
davinci_psc_config() now takes the flags
directly.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>

arch/arm/mach-davinci/clock.h

@@ -111,6 +111,7 @@ struct clk {
 #define CLK_PLL			BIT(4) /* PLL-derived clock */
 #define PRE_PLL			BIT(5) /* source is before PLL mult/div */
 #define PSC_SWRSTDISABLE	BIT(6) /* Disable state is SwRstDisable */
+#define PSC_FORCE		BIT(7) /* Force module state transtition */
 
 #define CLK(dev, con, ck) 	\
 	{			\

arch/arm/mach-davinci/include/mach/psc.h

@@ -244,6 +244,7 @@
 #define PSC_STATE_ENABLE	3
 
 #define MDSTAT_STATE_MASK 0x1f
+#define MDCTL_FORCE		BIT(31)
 
 #ifndef __ASSEMBLER__
 

arch/arm/mach-davinci/psc.c

@@ -75,6 +75,8 @@ void davinci_psc_config(unsigned int domain, unsigned int ctlr,
 	mdctl = __raw_readl(psc_base + MDCTL + 4 * id);
 	mdctl &= ~MDSTAT_STATE_MASK;
 	mdctl |= next_state;
+	if (flags & PSC_FORCE)
+		mdctl |= MDCTL_FORCE;
 	__raw_writel(mdctl, psc_base + MDCTL + 4 * id);
 
 	pdstat = __raw_readl(psc_base + PDSTAT);