Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

* 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (76 commits)
  PM / Hibernate: Implement compat_ioctl for /dev/snapshot
  PM / Freezer: fix return value of freezable_schedule_timeout_killable()
  PM / shmobile: Allow the A4R domain to be turned off at run time
  PM / input / touchscreen: Make st1232 use device PM QoS constraints
  PM / QoS: Introduce dev_pm_qos_add_ancestor_request()
  PM / shmobile: Remove the stay_on flag from SH7372's PM domains
  PM / shmobile: Don't include SH7372's INTCS in syscore suspend/resume
  PM / shmobile: Add support for the sh7372 A4S power domain / sleep mode
  PM: Drop generic_subsys_pm_ops
  PM / Sleep: Remove forward-only callbacks from AMBA bus type
  PM / Sleep: Remove forward-only callbacks from platform bus type
  PM: Run the driver callback directly if the subsystem one is not there
  PM / Sleep: Make pm_op() and pm_noirq_op() return callback pointers
  PM/Devfreq: Add Exynos4-bus device DVFS driver for Exynos4210/4212/4412.
  PM / Sleep: Merge internal functions in generic_ops.c
  PM / Sleep: Simplify generic system suspend callbacks
  PM / Hibernate: Remove deprecated hibernation snapshot ioctls
  PM / Sleep: Fix freezer failures due to racy usermodehelper_is_disabled()
  ARM: S3C64XX: Implement basic power domain support
  PM / shmobile: Use common always on power domain governor
  ...

Fix up trivial conflict in fs/xfs/xfs_buf.c due to removal of unused
XBT_FORCE_SLEEP bit

1 files changed, 146 insertions, 50 deletions

diff --git a/arch/arm/mach-shmobile/pm-sh7372.c b/arch/arm/mach-shmobile/pm-sh7372.c
index 34bbcbfb1706..77b8fc12fc2f 100644
--- a/arch/arm/mach-shmobile/pm-sh7372.c
+++ b/arch/arm/mach-shmobile/pm-sh7372.c
@@ -82,11 +82,12 @@ static int pd_power_down(struct generic_pm_domain *genpd)
         struct sh7372_pm_domain *sh7372_pd = to_sh7372_pd(genpd);
         unsigned int mask = 1 << sh7372_pd->bit_shift;
 
-        if (sh7372_pd->suspend)
-                sh7372_pd->suspend();
+        if (sh7372_pd->suspend) {
+                int ret = sh7372_pd->suspend();
 
-        if (sh7372_pd->stay_on)
-                return 0;
+                if (ret)
+                        return ret;
+        }
 
         if (__raw_readl(PSTR) & mask) {
                 unsigned int retry_count;
@@ -101,8 +102,8 @@ static int pd_power_down(struct generic_pm_domain *genpd)
         }
 
         if (!sh7372_pd->no_debug)
-                pr_debug("sh7372 power domain down 0x%08x -> PSTR = 0x%08x\n",
-                         mask, __raw_readl(PSTR));
+                pr_debug("%s: Power off, 0x%08x -> PSTR = 0x%08x\n",
+                         genpd->name, mask, __raw_readl(PSTR));
 
         return 0;
 }
@@ -113,9 +114,6 @@ static int __pd_power_up(struct sh7372_pm_domain *sh7372_pd, bool do_resume)
         unsigned int retry_count;
         int ret = 0;
 
-        if (sh7372_pd->stay_on)
-                goto out;
-
         if (__raw_readl(PSTR) & mask)
                 goto out;
 
@@ -133,8 +131,8 @@ static int __pd_power_up(struct sh7372_pm_domain *sh7372_pd, bool do_resume)
                 ret = -EIO;
 
         if (!sh7372_pd->no_debug)
-                pr_debug("sh7372 power domain up 0x%08x -> PSTR = 0x%08x\n",
-                         mask, __raw_readl(PSTR));
+                pr_debug("%s: Power on, 0x%08x -> PSTR = 0x%08x\n",
+                         sh7372_pd->genpd.name, mask, __raw_readl(PSTR));
 
  out:
         if (ret == 0 && sh7372_pd->resume && do_resume)
@@ -148,35 +146,60 @@ static int pd_power_up(struct generic_pm_domain *genpd)
          return __pd_power_up(to_sh7372_pd(genpd), true);
 }
 
-static void sh7372_a4r_suspend(void)
+static int sh7372_a4r_suspend(void)
 {
         sh7372_intcs_suspend();
         __raw_writel(0x300fffff, WUPRMSK); /* avoid wakeup */
+        return 0;
 }
 
 static bool pd_active_wakeup(struct device *dev)
 {
-        return true;
+        bool (*active_wakeup)(struct device *dev);
+
+        active_wakeup = dev_gpd_data(dev)->ops.active_wakeup;
+        return active_wakeup ? active_wakeup(dev) : true;
 }
 
-static bool sh7372_power_down_forbidden(struct dev_pm_domain *domain)
+static int sh7372_stop_dev(struct device *dev)
 {
-        return false;
+        int (*stop)(struct device *dev);
+
+        stop = dev_gpd_data(dev)->ops.stop;
+        if (stop) {
+                int ret = stop(dev);
+                if (ret)
+                        return ret;
+        }
+        return pm_clk_suspend(dev);
 }
 
-struct dev_power_governor sh7372_always_on_gov = {
-        .power_down_ok = sh7372_power_down_forbidden,
-};
+static int sh7372_start_dev(struct device *dev)
+{
+        int (*start)(struct device *dev);
+        int ret;
+
+        ret = pm_clk_resume(dev);
+        if (ret)
+                return ret;
+
+        start = dev_gpd_data(dev)->ops.start;
+        if (start)
+                ret = start(dev);
+
+        return ret;
+}
 
 void sh7372_init_pm_domain(struct sh7372_pm_domain *sh7372_pd)
 {
         struct generic_pm_domain *genpd = &sh7372_pd->genpd;
+        struct dev_power_governor *gov = sh7372_pd->gov;
 
-        pm_genpd_init(genpd, sh7372_pd->gov, false);
-        genpd->stop_device = pm_clk_suspend;
-        genpd->start_device = pm_clk_resume;
+        pm_genpd_init(genpd, gov ? : &simple_qos_governor, false);
+        genpd->dev_ops.stop = sh7372_stop_dev;
+        genpd->dev_ops.start = sh7372_start_dev;
+        genpd->dev_ops.active_wakeup = pd_active_wakeup;
         genpd->dev_irq_safe = true;
-        genpd->active_wakeup = pd_active_wakeup;
         genpd->power_off = pd_power_down;
         genpd->power_on = pd_power_up;
         __pd_power_up(sh7372_pd, false);
@@ -199,48 +222,73 @@ void sh7372_pm_add_subdomain(struct sh7372_pm_domain *sh7372_pd,
 }
 
 struct sh7372_pm_domain sh7372_a4lc = {
+        .genpd.name = "A4LC",
         .bit_shift = 1,
 };
 
 struct sh7372_pm_domain sh7372_a4mp = {
+        .genpd.name = "A4MP",
         .bit_shift = 2,
 };
 
 struct sh7372_pm_domain sh7372_d4 = {
+        .genpd.name = "D4",
         .bit_shift = 3,
 };
 
 struct sh7372_pm_domain sh7372_a4r = {
+        .genpd.name = "A4R",
         .bit_shift = 5,
-        .gov = &sh7372_always_on_gov,
         .suspend = sh7372_a4r_suspend,
         .resume = sh7372_intcs_resume,
-        .stay_on = true,
 };
 
 struct sh7372_pm_domain sh7372_a3rv = {
+        .genpd.name = "A3RV",
         .bit_shift = 6,
 };
 
 struct sh7372_pm_domain sh7372_a3ri = {
+        .genpd.name = "A3RI",
         .bit_shift = 8,
 };
 
-struct sh7372_pm_domain sh7372_a3sp = {
-        .bit_shift = 11,
-        .gov = &sh7372_always_on_gov,
+static int sh7372_a4s_suspend(void)
+{
+        /*
+         * The A4S domain contains the CPU core and therefore it should
+         * only be turned off if the CPU is in use.
+         */
+        return -EBUSY;
+}
+
+struct sh7372_pm_domain sh7372_a4s = {
+        .genpd.name = "A4S",
+        .bit_shift = 10,
+        .gov = &pm_domain_always_on_gov,
         .no_debug = true,
+        .suspend = sh7372_a4s_suspend,
 };
 
-static void sh7372_a3sp_init(void)
+static int sh7372_a3sp_suspend(void)
 {
-        /* serial consoles make use of SCIF hardware located in A3SP,
+        /*
+         * Serial consoles make use of SCIF hardware located in A3SP,
          * keep such power domain on if "no_console_suspend" is set.
          */
-        sh7372_a3sp.stay_on = !console_suspend_enabled;
+        return console_suspend_enabled ? -EBUSY : 0;
 }
 
+struct sh7372_pm_domain sh7372_a3sp = {
+        .genpd.name = "A3SP",
+        .bit_shift = 11,
+        .gov = &pm_domain_always_on_gov,
+        .no_debug = true,
+        .suspend = sh7372_a3sp_suspend,
+};
+
 struct sh7372_pm_domain sh7372_a3sg = {
+        .genpd.name = "A3SG",
         .bit_shift = 13,
 };
 
@@ -257,11 +305,16 @@ static int sh7372_do_idle_core_standby(unsigned long unused)
         return 0;
 }
 
-static void sh7372_enter_core_standby(void)
+static void sh7372_set_reset_vector(unsigned long address)
 {
         /* set reset vector, translate 4k */
-        __raw_writel(__pa(sh7372_resume_core_standby_a3sm), SBAR);
+        __raw_writel(address, SBAR);
         __raw_writel(0, APARMBAREA);
+}
+
+static void sh7372_enter_core_standby(void)
+{
+        sh7372_set_reset_vector(__pa(sh7372_resume_core_standby_sysc));
 
         /* enter sleep mode with SYSTBCR to 0x10 */
         __raw_writel(0x10, SYSTBCR);
@@ -274,27 +327,22 @@ static void sh7372_enter_core_standby(void)
 #endif
 
 #ifdef CONFIG_SUSPEND
-static void sh7372_enter_a3sm_common(int pllc0_on)
+static void sh7372_enter_sysc(int pllc0_on, unsigned long sleep_mode)
 {
-        /* set reset vector, translate 4k */
-        __raw_writel(__pa(sh7372_resume_core_standby_a3sm), SBAR);
-        __raw_writel(0, APARMBAREA);
-
         if (pllc0_on)
                 __raw_writel(0, PLLC01STPCR);
         else
                 __raw_writel(1 << 28, PLLC01STPCR);
 
-        __raw_writel(0, PDNSEL); /* power-down A3SM only, not A4S */
         __raw_readl(WUPSFAC); /* read wakeup int. factor before sleep */
-        cpu_suspend(0, sh7372_do_idle_a3sm);
+        cpu_suspend(sleep_mode, sh7372_do_idle_sysc);
         __raw_readl(WUPSFAC); /* read wakeup int. factor after wakeup */
 
          /* disable reset vector translation */
         __raw_writel(0, SBAR);
 }
 
-static int sh7372_a3sm_valid(unsigned long *mskp, unsigned long *msk2p)
+static int sh7372_sysc_valid(unsigned long *mskp, unsigned long *msk2p)
 {
         unsigned long mstpsr0, mstpsr1, mstpsr2, mstpsr3, mstpsr4;
         unsigned long msk, msk2;
@@ -382,7 +430,7 @@ static void sh7372_icr_to_irqcr(unsigned long icr, u16 *irqcr1p, u16 *irqcr2p)
         *irqcr2p = irqcr2;
 }
 
-static void sh7372_setup_a3sm(unsigned long msk, unsigned long msk2)
+static void sh7372_setup_sysc(unsigned long msk, unsigned long msk2)
 {
         u16 irqcrx_low, irqcrx_high, irqcry_low, irqcry_high;
         unsigned long tmp;
@@ -415,6 +463,22 @@ static void sh7372_setup_a3sm(unsigned long msk, unsigned long msk2)
         __raw_writel((irqcrx_high << 16) | irqcrx_low, IRQCR3);
         __raw_writel((irqcry_high << 16) | irqcry_low, IRQCR4);
 }
+
+static void sh7372_enter_a3sm_common(int pllc0_on)
+{
+        sh7372_set_reset_vector(__pa(sh7372_resume_core_standby_sysc));
+        sh7372_enter_sysc(pllc0_on, 1 << 12);
+}
+
+static void sh7372_enter_a4s_common(int pllc0_on)
+{
+        sh7372_intca_suspend();
+        memcpy((void *)SMFRAM, sh7372_resume_core_standby_sysc, 0x100);
+        sh7372_set_reset_vector(SMFRAM);
+        sh7372_enter_sysc(pllc0_on, 1 << 10);
+        sh7372_intca_resume();
+}
+
 #endif
 
 #ifdef CONFIG_CPU_IDLE
@@ -448,14 +512,20 @@ static int sh7372_enter_suspend(suspend_state_t suspend_state)
         unsigned long msk, msk2;
 
         /* check active clocks to determine potential wakeup sources */
-        if (sh7372_a3sm_valid(&msk, &msk2)) {
-
+        if (sh7372_sysc_valid(&msk, &msk2)) {
                 /* convert INTC mask and sense to SYSC mask and sense */
-                sh7372_setup_a3sm(msk, msk2);
-
-                /* enter A3SM sleep with PLLC0 off */
-                pr_debug("entering A3SM\n");
-                sh7372_enter_a3sm_common(0);
+                sh7372_setup_sysc(msk, msk2);
+
+                if (!console_suspend_enabled &&
+                    sh7372_a4s.genpd.status == GPD_STATE_POWER_OFF) {
+                        /* enter A4S sleep with PLLC0 off */
+                        pr_debug("entering A4S\n");
+                        sh7372_enter_a4s_common(0);
+                } else {
+                        /* enter A3SM sleep with PLLC0 off */
+                        pr_debug("entering A3SM\n");
+                        sh7372_enter_a3sm_common(0);
+                }
         } else {
                 /* default to Core Standby that supports all wakeup sources */
                 pr_debug("entering Core Standby\n");
@@ -464,9 +534,37 @@ static int sh7372_enter_suspend(suspend_state_t suspend_state)
         return 0;
 }
 
+/**
+ * sh7372_pm_notifier_fn - SH7372 PM notifier routine.
+ * @notifier: Unused.
+ * @pm_event: Event being handled.
+ * @unused: Unused.
+ */
+static int sh7372_pm_notifier_fn(struct notifier_block *notifier,
+                                 unsigned long pm_event, void *unused)
+{
+        switch (pm_event) {
+        case PM_SUSPEND_PREPARE:
+                /*
+                 * This is necessary, because the A4R domain has to be "on"
+                 * when suspend_device_irqs() and resume_device_irqs() are
+                 * executed during system suspend and resume, respectively, so
+                 * that those functions don't crash while accessing the INTCS.
+                 */
+                pm_genpd_poweron(&sh7372_a4r.genpd);
+                break;
+        case PM_POST_SUSPEND:
+                pm_genpd_poweroff_unused();
+                break;
+        }
+
+        return NOTIFY_DONE;
+}
+
 static void sh7372_suspend_init(void)
 {
         shmobile_suspend_ops.enter = sh7372_enter_suspend;
+        pm_notifier(sh7372_pm_notifier_fn, 0);
 }
 #else
 static void sh7372_suspend_init(void) {}
@@ -482,8 +580,6 @@ void __init sh7372_pm_init(void)
         /* do not convert A3SM, A3SP, A3SG, A4R power down into A4S */
         __raw_writel(0, PDNSEL);
 
-        sh7372_a3sp_init();
-
         sh7372_suspend_init();
         sh7372_cpuidle_init();
 }