diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c index a1555627ad97..cbb879139c51 100644 --- a/arch/arm/mach-omap2/clockdomain.c +++ b/arch/arm/mach-omap2/clockdomain.c @@ -899,6 +899,23 @@ bool clkdm_in_hwsup(struct clockdomain *clkdm) return ret; } +/** + * clkdm_missing_idle_reporting - can @clkdm enter autoidle even if in use? + * @clkdm: struct clockdomain * + * + * Returns true if clockdomain @clkdm has the + * CLKDM_MISSING_IDLE_REPORTING flag set, or false if not or @clkdm is + * null. More information is available in the documentation for the + * CLKDM_MISSING_IDLE_REPORTING macro. + */ +bool clkdm_missing_idle_reporting(struct clockdomain *clkdm) +{ + if (!clkdm) + return false; + + return (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING) ? true : false; +} + /* Clockdomain-to-clock/hwmod framework interface code */ static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm) diff --git a/arch/arm/mach-omap2/clockdomain.h b/arch/arm/mach-omap2/clockdomain.h index 5601dc13785e..629576be7444 100644 --- a/arch/arm/mach-omap2/clockdomain.h +++ b/arch/arm/mach-omap2/clockdomain.h @@ -1,9 +1,7 @@ /* - * arch/arm/plat-omap/include/mach/clockdomain.h - * * OMAP2/3 clockdomain framework functions * - * Copyright (C) 2008 Texas Instruments, Inc. + * Copyright (C) 2008, 2012 Texas Instruments, Inc. * Copyright (C) 2008-2011 Nokia Corporation * * Paul Walmsley @@ -34,6 +32,20 @@ * CLKDM_ACTIVE_WITH_MPU: The PRCM guarantees that this clockdomain is * active whenever the MPU is active. True for interconnects and * the WKUP clockdomains. + * CLKDM_MISSING_IDLE_REPORTING: The idle status of the IP blocks and + * clocks inside this clockdomain are not taken into account by + * the PRCM when determining whether the clockdomain is idle. + * Without this flag, if the clockdomain is set to + * hardware-supervised idle mode, the PRCM may transition the + * enclosing powerdomain to a low power state, even when devices + * inside the clockdomain and powerdomain are in use. (An example + * of such a clockdomain is the EMU clockdomain on OMAP3/4.) If + * this flag is set, and the clockdomain does not support the + * force-sleep mode, then the HW_AUTO mode will be used to put the + * clockdomain to sleep. Similarly, if the clockdomain supports + * the force-wakeup mode, then it will be used whenever a clock or + * IP block inside the clockdomain is active, rather than the + * HW_AUTO mode. */ #define CLKDM_CAN_FORCE_SLEEP (1 << 0) #define CLKDM_CAN_FORCE_WAKEUP (1 << 1) @@ -41,6 +53,7 @@ #define CLKDM_CAN_DISABLE_AUTO (1 << 3) #define CLKDM_NO_AUTODEPS (1 << 4) #define CLKDM_ACTIVE_WITH_MPU (1 << 5) +#define CLKDM_MISSING_IDLE_REPORTING (1 << 6) #define CLKDM_CAN_HWSUP (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_DISABLE_AUTO) #define CLKDM_CAN_SWSUP (CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP) @@ -187,6 +200,7 @@ int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm); void clkdm_allow_idle(struct clockdomain *clkdm); void clkdm_deny_idle(struct clockdomain *clkdm); bool clkdm_in_hwsup(struct clockdomain *clkdm); +bool clkdm_missing_idle_reporting(struct clockdomain *clkdm); int clkdm_wakeup(struct clockdomain *clkdm); int clkdm_sleep(struct clockdomain *clkdm); diff --git a/arch/arm/mach-omap2/clockdomain2xxx_3xxx.c b/arch/arm/mach-omap2/clockdomain2xxx_3xxx.c index f99e65cfb862..9a7792aec673 100644 --- a/arch/arm/mach-omap2/clockdomain2xxx_3xxx.c +++ b/arch/arm/mach-omap2/clockdomain2xxx_3xxx.c @@ -162,6 +162,19 @@ static void _disable_hwsup(struct clockdomain *clkdm) clkdm->clktrctrl_mask); } +static int omap3_clkdm_sleep(struct clockdomain *clkdm) +{ + omap3xxx_cm_clkdm_force_sleep(clkdm->pwrdm.ptr->prcm_offs, + clkdm->clktrctrl_mask); + return 0; +} + +static int omap3_clkdm_wakeup(struct clockdomain *clkdm) +{ + omap3xxx_cm_clkdm_force_wakeup(clkdm->pwrdm.ptr->prcm_offs, + clkdm->clktrctrl_mask); + return 0; +} static int omap2_clkdm_clk_enable(struct clockdomain *clkdm) { @@ -170,6 +183,17 @@ static int omap2_clkdm_clk_enable(struct clockdomain *clkdm) if (!clkdm->clktrctrl_mask) return 0; + /* + * The CLKDM_MISSING_IDLE_REPORTING flag documentation has + * more details on the unpleasant problem this is working + * around + */ + if (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING && + !(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) { + _enable_hwsup(clkdm); + return 0; + } + hwsup = omap2_cm_is_clkdm_in_hwsup(clkdm->pwrdm.ptr->prcm_offs, clkdm->clktrctrl_mask); @@ -193,6 +217,17 @@ static int omap2_clkdm_clk_disable(struct clockdomain *clkdm) if (!clkdm->clktrctrl_mask) return 0; + /* + * The CLKDM_MISSING_IDLE_REPORTING flag documentation has + * more details on the unpleasant problem this is working + * around + */ + if ((clkdm->flags & CLKDM_MISSING_IDLE_REPORTING) && + (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)) { + omap3_clkdm_wakeup(clkdm); + return 0; + } + hwsup = omap2_cm_is_clkdm_in_hwsup(clkdm->pwrdm.ptr->prcm_offs, clkdm->clktrctrl_mask); @@ -209,20 +244,6 @@ static int omap2_clkdm_clk_disable(struct clockdomain *clkdm) return 0; } -static int omap3_clkdm_sleep(struct clockdomain *clkdm) -{ - omap3xxx_cm_clkdm_force_sleep(clkdm->pwrdm.ptr->prcm_offs, - clkdm->clktrctrl_mask); - return 0; -} - -static int omap3_clkdm_wakeup(struct clockdomain *clkdm) -{ - omap3xxx_cm_clkdm_force_wakeup(clkdm->pwrdm.ptr->prcm_offs, - clkdm->clktrctrl_mask); - return 0; -} - static void omap3_clkdm_allow_idle(struct clockdomain *clkdm) { if (atomic_read(&clkdm->usecount) > 0) diff --git a/arch/arm/mach-omap2/clockdomain44xx.c b/arch/arm/mach-omap2/clockdomain44xx.c index 762f2cc542ce..6fc6155625bc 100644 --- a/arch/arm/mach-omap2/clockdomain44xx.c +++ b/arch/arm/mach-omap2/clockdomain44xx.c @@ -113,6 +113,17 @@ static int omap4_clkdm_clk_disable(struct clockdomain *clkdm) if (!clkdm->prcm_partition) return 0; + /* + * The CLKDM_MISSING_IDLE_REPORTING flag documentation has + * more details on the unpleasant problem this is working + * around + */ + if (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING && + !(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) { + omap4_clkdm_allow_idle(clkdm); + return 0; + } + hwsup = omap4_cminst_is_clkdm_in_hwsup(clkdm->prcm_partition, clkdm->cm_inst, clkdm->clkdm_offs); diff --git a/arch/arm/mach-omap2/clockdomains3xxx_data.c b/arch/arm/mach-omap2/clockdomains3xxx_data.c index 56089c49142a..933a35cd124a 100644 --- a/arch/arm/mach-omap2/clockdomains3xxx_data.c +++ b/arch/arm/mach-omap2/clockdomains3xxx_data.c @@ -387,14 +387,11 @@ static struct clockdomain per_am35x_clkdm = { .clktrctrl_mask = OMAP3430_CLKTRCTRL_PER_MASK, }; -/* - * Disable hw supervised mode for emu_clkdm, because emu_pwrdm is - * switched of even if sdti is in use - */ static struct clockdomain emu_clkdm = { .name = "emu_clkdm", .pwrdm = { .name = "emu_pwrdm" }, - .flags = /* CLKDM_CAN_ENABLE_AUTO | */CLKDM_CAN_SWSUP, + .flags = (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_SWSUP | + CLKDM_MISSING_IDLE_REPORTING), .clktrctrl_mask = OMAP3430_CLKTRCTRL_EMU_MASK, }; diff --git a/arch/arm/mach-omap2/clockdomains44xx_data.c b/arch/arm/mach-omap2/clockdomains44xx_data.c index 63d60a773d3b..b56d06b48782 100644 --- a/arch/arm/mach-omap2/clockdomains44xx_data.c +++ b/arch/arm/mach-omap2/clockdomains44xx_data.c @@ -390,7 +390,8 @@ static struct clockdomain emu_sys_44xx_clkdm = { .prcm_partition = OMAP4430_PRM_PARTITION, .cm_inst = OMAP4430_PRM_EMU_CM_INST, .clkdm_offs = OMAP4430_PRM_EMU_CM_EMU_CDOFFS, - .flags = CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_FORCE_WAKEUP, + .flags = (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_FORCE_WAKEUP | + CLKDM_MISSING_IDLE_REPORTING), }; static struct clockdomain l3_dma_44xx_clkdm = { diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c index 21299879d2d5..6af64bbd9e1d 100644 --- a/arch/arm/mach-omap2/omap_hwmod.c +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -2007,7 +2007,8 @@ static int _enable(struct omap_hwmod *oh) * completely the module. The clockdomain can be set * in HW_AUTO only when the module become ready. */ - hwsup = clkdm_in_hwsup(oh->clkdm); + hwsup = clkdm_in_hwsup(oh->clkdm) && + !clkdm_missing_idle_reporting(oh->clkdm); r = clkdm_hwmod_enable(oh->clkdm, oh); if (r) { WARN(1, "omap_hwmod: %s: could not enable clockdomain %s: %d\n", diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c index f6f05b67f86a..abefbc4d8e0b 100644 --- a/arch/arm/mach-omap2/pm.c +++ b/arch/arm/mach-omap2/pm.c @@ -80,7 +80,8 @@ static void __init omap2_init_processor_devices(void) int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused) { - if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO) + if ((clkdm->flags & CLKDM_CAN_ENABLE_AUTO) && + !(clkdm->flags & CLKDM_MISSING_IDLE_REPORTING)) clkdm_allow_idle(clkdm); else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP && atomic_read(&clkdm->usecount) == 0)