OMAP3: PM: Add milliseconds interface to suspend wakeup timer

Millisecond resolution is possible and there are use cases for it
(automatic testing).

Seconds-based interface is preserved for compatibility.

Signed-off-by: Ari Kauppi <Ext-Ari.Kauppi@nokia.com>
Reviewed-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

3 files changed, 14 insertions, 7 deletions

diff --git a/arch/arm/mach-omap2/pm-debug.c b/arch/arm/mach-omap2/pm-debug.c
index 6cac9817c243..723b44e252fd 100644
--- a/arch/arm/mach-omap2/pm-debug.c
+++ b/arch/arm/mach-omap2/pm-debug.c
@@ -548,6 +548,9 @@ static int option_set(void *data, u64 val)
 {
         u32 *option = data;
 
+        if (option == &wakeup_timer_milliseconds && val >= 1000)
+                return -EINVAL;
+
         *option = val;
 
         if (option == &enable_off_mode)
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index bd6466a2b039..3de6ece23fc8 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -43,6 +43,7 @@ extern int omap3_pm_get_suspend_state(struct powerdomain *pwrdm);
 extern int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state);
 
 extern u32 wakeup_timer_seconds;
+extern u32 wakeup_timer_milliseconds;
 extern struct omap_dm_timer *gptimer_wakeup;
 
 #ifdef CONFIG_PM_DEBUG
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index a15aa92d384e..e76af5b532a0 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -58,6 +58,7 @@
 u32 enable_off_mode;
 u32 sleep_while_idle;
 u32 wakeup_timer_seconds;
+u32 wakeup_timer_milliseconds;
 
 struct power_state {
         struct powerdomain *pwrdm;
@@ -555,20 +556,21 @@ out:
 #ifdef CONFIG_SUSPEND
 static suspend_state_t suspend_state;
 
-static void omap2_pm_wakeup_on_timer(u32 seconds)
+static void omap2_pm_wakeup_on_timer(u32 seconds, u32 milliseconds)
 {
         u32 tick_rate, cycles;
 
-        if (!seconds)
+        if (!seconds && !milliseconds)
                 return;
 
         tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer_wakeup));
-        cycles = tick_rate * seconds;
+        cycles = tick_rate * seconds + tick_rate * milliseconds / 1000;
         omap_dm_timer_stop(gptimer_wakeup);
         omap_dm_timer_set_load_start(gptimer_wakeup, 0, 0xffffffff - cycles);
 
-        pr_info("PM: Resume timer in %d secs (%d ticks at %d ticks/sec.)\n",
-                seconds, cycles, tick_rate);
+        pr_info("PM: Resume timer in %u.%03u secs"
+                " (%d ticks at %d ticks/sec.)\n",
+                seconds, milliseconds, cycles, tick_rate);
 }
 
 static int omap3_pm_prepare(void)
@@ -582,8 +584,9 @@ static int omap3_pm_suspend(void)
         struct power_state *pwrst;
         int state, ret = 0;
 
-        if (wakeup_timer_seconds)
-                omap2_pm_wakeup_on_timer(wakeup_timer_seconds);
+        if (wakeup_timer_seconds || wakeup_timer_milliseconds)
+                omap2_pm_wakeup_on_timer(wakeup_timer_seconds,
+                                         wakeup_timer_milliseconds);
 
         /* Read current next_pwrsts */
         list_for_each_entry(pwrst, &pwrst_list, node)