1 files changed, 30 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
index 8edb015f561..715035d0512 100644
--- a/arch/arm/mach-omap2/pm44xx.c
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -99,6 +99,8 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
 static int __init omap4_pm_init(void)
 {
         int ret;
+        struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm;
+        struct clockdomain *ducati_clkdm, *l3_2_clkdm, *l4_per_clkdm;
 
         if (!cpu_is_omap44xx())
                 return -ENODEV;
@@ -111,6 +113,34 @@ static int __init omap4_pm_init(void)
                 goto err2;
         }
 
+        /*
+         * The dynamic dependency between MPUSS -> MEMIF and
+         * MPUSS -> L4_PER/L3_* and DUCATI -> L3_* doesn't work as
+         * expected. The hardware recommendation is to enable static
+         * dependencies for these to avoid system lock ups or random crashes.
+         */
+        mpuss_clkdm = clkdm_lookup("mpuss_clkdm");
+        emif_clkdm = clkdm_lookup("l3_emif_clkdm");
+        l3_1_clkdm = clkdm_lookup("l3_1_clkdm");
+        l3_2_clkdm = clkdm_lookup("l3_2_clkdm");
+        l4_per_clkdm = clkdm_lookup("l4_per_clkdm");
+        ducati_clkdm = clkdm_lookup("ducati_clkdm");
+        if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) ||
+                (!l3_2_clkdm) || (!ducati_clkdm) || (!l4_per_clkdm))
+                goto err2;
+
+        ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm);
+        ret |= clkdm_add_wkdep(mpuss_clkdm, l3_1_clkdm);
+        ret |= clkdm_add_wkdep(mpuss_clkdm, l3_2_clkdm);
+        ret |= clkdm_add_wkdep(mpuss_clkdm, l4_per_clkdm);
+        ret |= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm);
+        ret |= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm);
+        if (ret) {
+                pr_err("Failed to add MPUSS -> L3/EMIF/L4PER, DUCATI -> L3 "
+                                "wakeup dependency\n");
+                goto err2;
+        }
+
 #ifdef CONFIG_SUSPEND
         suspend_set_ops(&omap_pm_ops);
 #endif /* CONFIG_SUSPEND */