Merge branch 'for-3.4/drivers' of git://git.kernel.dk/linux-block

[cascardo/linux.git] / arch / arm / mach-omap2 / pm44xx.c

diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
index 9ccaadc..8856253 100644 (file)
--- a/arch/arm/mach-omap2/pm44xx.c
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -144,7 +144,7 @@ static void omap_default_idle(void)
 static int __init omap4_pm_init(void)
 {
        int ret;
-       struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm;
+       struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm, *l4wkup;
        struct clockdomain *ducati_clkdm, *l3_2_clkdm, *l4_per_clkdm;
 
        if (!cpu_is_omap44xx())
@@ -168,14 +168,19 @@ static int __init omap4_pm_init(void)
         * 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.
+        * The L4 wakeup depedency is added to workaround the OCP sync hardware
+        * BUG with 32K synctimer which lead to incorrect timer value read
+        * from the 32K counter. The BUG applies for GPTIMER1 and WDT2 which
+        * are part of L4 wakeup clockdomain.
         */
        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");
+       l4wkup = clkdm_lookup("l4_wkup_clkdm");
        ducati_clkdm = clkdm_lookup("ducati_clkdm");
-       if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) ||
+       if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) || (!l4wkup) ||
                (!l3_2_clkdm) || (!ducati_clkdm) || (!l4_per_clkdm))
                goto err2;
 
@@ -183,6 +188,7 @@ static int __init omap4_pm_init(void)
        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(mpuss_clkdm, l4wkup);
        ret |= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm);
        ret |= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm);
        if (ret) {