From aad70de20fc69970a3080e7e8f02b54a4a3fe3e6 Mon Sep 17 00:00:00 2001 From: Sekhar Nori Date: Wed, 6 Jul 2011 06:01:22 +0000 Subject: [PATCH] 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: Sekhar Nori --- arch/arm/mach-davinci/clock.h | 1 + arch/arm/mach-davinci/include/mach/psc.h | 1 + arch/arm/mach-davinci/psc.c | 2 ++ 3 files changed, 4 insertions(+) diff --git a/arch/arm/mach-davinci/clock.h b/arch/arm/mach-davinci/clock.h index 0dd22031ec62..48ee4627e188 100644 --- a/arch/arm/mach-davinci/clock.h +++ b/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) \ { \ diff --git a/arch/arm/mach-davinci/include/mach/psc.h b/arch/arm/mach-davinci/include/mach/psc.h index 215fcca6bbdc..6213f0d4211d 100644 --- a/arch/arm/mach-davinci/include/mach/psc.h +++ b/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__ diff --git a/arch/arm/mach-davinci/psc.c b/arch/arm/mach-davinci/psc.c index 823cb1b9e484..1fb6bdff38c1 100644 --- a/arch/arm/mach-davinci/psc.c +++ b/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);