From: Rajendra Nayak <[email protected]> Since the clkdm state programming is now done from within the hwmod framework (which uses a per-hwmod lock) instead of the being done from the clock framework (which used a global lock), there is now a need to have per-clkdm locking to prevent races between different hwmods/modules belonging to the same clock domain concurrently programming the clkdm state.
Signed-off-by: Rajendra Nayak <[email protected]> Signed-off-by: Benoit Cousson <[email protected]> Cc: Paul Walmsley <[email protected]> --- arch/arm/mach-omap2/clockdomain.c | 42 ++++++++++++++++++++++++++-- arch/arm/mach-omap2/clockdomain.h | 2 + arch/arm/mach-omap2/clockdomain2xxx_3xxx.c | 6 ++- arch/arm/mach-omap2/clockdomain44xx.c | 13 ++------ 4 files changed, 49 insertions(+), 14 deletions(-) diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c index 10f6bd2..cc2e495 100644 --- a/arch/arm/mach-omap2/clockdomain.c +++ b/arch/arm/mach-omap2/clockdomain.c @@ -92,6 +92,8 @@ static int _clkdm_register(struct clockdomain *clkdm) pwrdm_add_clkdm(pwrdm, clkdm); + spin_lock_init(&clkdm->lock); + pr_debug("clockdomain: registered %s\n", clkdm->name); return 0; @@ -690,6 +692,9 @@ int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm) */ int clkdm_sleep(struct clockdomain *clkdm) { + int ret; + unsigned long flags; + if (!clkdm) return -EINVAL; @@ -704,7 +709,10 @@ int clkdm_sleep(struct clockdomain *clkdm) pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name); - return arch_clkdm->clkdm_sleep(clkdm); + spin_lock_irqsave(&clkdm->lock, flags); + ret = arch_clkdm->clkdm_sleep(clkdm); + spin_unlock_irqrestore(&clkdm->lock, flags); + return ret; } /** @@ -718,6 +726,9 @@ int clkdm_sleep(struct clockdomain *clkdm) */ int clkdm_wakeup(struct clockdomain *clkdm) { + int ret; + unsigned long flags; + if (!clkdm) return -EINVAL; @@ -732,7 +743,10 @@ int clkdm_wakeup(struct clockdomain *clkdm) pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name); - return arch_clkdm->clkdm_wakeup(clkdm); + spin_lock_irqsave(&clkdm->lock, flags); + ret = arch_clkdm->clkdm_wakeup(clkdm); + spin_unlock_irqrestore(&clkdm->lock, flags); + return ret; } /** @@ -747,6 +761,8 @@ int clkdm_wakeup(struct clockdomain *clkdm) */ void clkdm_allow_idle(struct clockdomain *clkdm) { + unsigned long flags; + if (!clkdm) return; @@ -762,8 +778,10 @@ void clkdm_allow_idle(struct clockdomain *clkdm) pr_debug("clockdomain: enabling automatic idle transitions for %s\n", clkdm->name); + spin_lock_irqsave(&clkdm->lock, flags); arch_clkdm->clkdm_allow_idle(clkdm); pwrdm_clkdm_state_switch(clkdm); + spin_unlock_irqrestore(&clkdm->lock, flags); } /** @@ -777,6 +795,8 @@ void clkdm_allow_idle(struct clockdomain *clkdm) */ void clkdm_deny_idle(struct clockdomain *clkdm) { + unsigned long flags; + if (!clkdm) return; @@ -792,7 +812,9 @@ void clkdm_deny_idle(struct clockdomain *clkdm) pr_debug("clockdomain: disabling automatic idle transitions for %s\n", clkdm->name); + spin_lock_irqsave(&clkdm->lock, flags); arch_clkdm->clkdm_deny_idle(clkdm); + spin_unlock_irqrestore(&clkdm->lock, flags); } /** @@ -805,6 +827,9 @@ void clkdm_deny_idle(struct clockdomain *clkdm) */ int clkdm_allows_idle(struct clockdomain *clkdm) { + int ret; + unsigned long flags; + if (!clkdm) return -EINVAL; @@ -813,7 +838,10 @@ int clkdm_allows_idle(struct clockdomain *clkdm) pr_debug("clockdomain: reading idle state for %s\n", clkdm->name); - return arch_clkdm->clkdm_allows_idle(clkdm); + spin_lock_irqsave(&clkdm->lock, flags); + ret = arch_clkdm->clkdm_allows_idle(clkdm); + spin_unlock_irqrestore(&clkdm->lock, flags); + return ret; } @@ -821,6 +849,8 @@ int clkdm_allows_idle(struct clockdomain *clkdm) static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm) { + unsigned long flags; + if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_enable) return -EINVAL; @@ -832,9 +862,11 @@ static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm) if ((atomic_inc_return(&clkdm->usecount) > 1) && autodeps) return 0; + spin_lock_irqsave(&clkdm->lock, flags); arch_clkdm->clkdm_clk_enable(clkdm); pwrdm_wait_transition(clkdm->pwrdm.ptr); pwrdm_clkdm_state_switch(clkdm); + spin_unlock_irqrestore(&clkdm->lock, flags); pr_debug("clockdomain: clkdm %s: enabled\n", clkdm->name); @@ -843,6 +875,8 @@ static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm) static int _clkdm_clk_hwmod_disable(struct clockdomain *clkdm) { + unsigned long flags; + if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_disable) return -EINVAL; @@ -854,8 +888,10 @@ static int _clkdm_clk_hwmod_disable(struct clockdomain *clkdm) if (atomic_dec_return(&clkdm->usecount) > 0) return 0; + spin_lock_irqsave(&clkdm->lock, flags); arch_clkdm->clkdm_clk_disable(clkdm); pwrdm_clkdm_state_switch(clkdm); + spin_unlock_irqrestore(&clkdm->lock, flags); pr_debug("clockdomain: clkdm %s: disabled\n", clkdm->name); diff --git a/arch/arm/mach-omap2/clockdomain.h b/arch/arm/mach-omap2/clockdomain.h index 8f0a7d6..b51f558 100644 --- a/arch/arm/mach-omap2/clockdomain.h +++ b/arch/arm/mach-omap2/clockdomain.h @@ -17,6 +17,7 @@ #define __ARCH_ARM_MACH_OMAP2_CLOCKDOMAIN_H #include <linux/init.h> +#include <linux/spinlock.h> #include "powerdomain.h" #include <plat/clock.h> @@ -123,6 +124,7 @@ struct clockdomain { const struct omap_chip_id omap_chip; atomic_t usecount; struct list_head node; + spinlock_t lock; }; /** diff --git a/arch/arm/mach-omap2/clockdomain2xxx_3xxx.c b/arch/arm/mach-omap2/clockdomain2xxx_3xxx.c index 81f3e46..d94a121 100644 --- a/arch/arm/mach-omap2/clockdomain2xxx_3xxx.c +++ b/arch/arm/mach-omap2/clockdomain2xxx_3xxx.c @@ -193,7 +193,8 @@ static int omap2_clkdm_clk_enable(struct clockdomain *clkdm) _clkdm_add_autodeps(clkdm); _enable_hwsup(clkdm); } else { - clkdm_wakeup(clkdm); + if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP) + omap2_clkdm_wakeup(clkdm); } return 0; @@ -215,7 +216,8 @@ static int omap2_clkdm_clk_disable(struct clockdomain *clkdm) _clkdm_del_autodeps(clkdm); _enable_hwsup(clkdm); } else { - clkdm_sleep(clkdm); + if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP) + omap2_clkdm_sleep(clkdm); } return 0; diff --git a/arch/arm/mach-omap2/clockdomain44xx.c b/arch/arm/mach-omap2/clockdomain44xx.c index 1599b18..3192a5e 100644 --- a/arch/arm/mach-omap2/clockdomain44xx.c +++ b/arch/arm/mach-omap2/clockdomain44xx.c @@ -101,13 +101,8 @@ static int omap4_clkdm_allows_idle(struct clockdomain *clkdm) static int omap4_clkdm_clk_enable(struct clockdomain *clkdm) { - bool hwsup = false; - - hwsup = omap4_cminst_is_clkdm_in_hwsup(clkdm->prcm_partition, - clkdm->cm_inst, clkdm->clkdm_offs); - - if (!hwsup) - clkdm_wakeup(clkdm); + if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP) + return omap4_clkdm_wakeup(clkdm); return 0; } @@ -119,8 +114,8 @@ static int omap4_clkdm_clk_disable(struct clockdomain *clkdm) hwsup = omap4_cminst_is_clkdm_in_hwsup(clkdm->prcm_partition, clkdm->cm_inst, clkdm->clkdm_offs); - if (!hwsup) - clkdm_sleep(clkdm); + if (!hwsup && (clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) + omap4_clkdm_sleep(clkdm); return 0; } -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
