Add the save and restore for clksrc as part of suspend and resume
so that it saves the counter value and restores. This is needed in
modes like rtc+ddr in self-refresh not doing this stalls the time.
Signed-off-by: Keerthy <j-keerthy@xxxxxx>
---
Changes in v2:
* Instead of everytime looking up for clksrc hwmod doing it once during init
* Tested on am437x-gp-evm
Probably too late for 4.18!
arch/arm/mach-omap2/timer.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 5a70ab6..98ed5ac 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -70,6 +70,9 @@
/* Clockevent hwmod for am335x and am437x suspend */
static struct omap_hwmod *clockevent_gpt_hwmod;
+/* Clockesource hwmod for am437x suspend */
+static struct omap_hwmod *clocksource_gpt_hwmod;
+
#ifdef CONFIG_SOC_HAS_REALTIME_COUNTER
static unsigned long arch_timer_freq;
@@ -478,6 +481,26 @@ static int __init __maybe_unused omap2_sync32k_clocksource_init(void)
return ret;
}
+static unsigned int omap2_gptimer_clksrc_load;
+
+static void omap2_gptimer_clksrc_suspend(struct clocksource *unused)
+{
+ omap2_gptimer_clksrc_load =
+ __omap_dm_timer_read_counter(&clksrc, OMAP_TIMER_NONPOSTED);
+
+ omap_hwmod_idle(clocksource_gpt_hwmod);
+}
+
+static void omap2_gptimer_clksrc_resume(struct clocksource *unused)
+{
+ omap_hwmod_enable(clocksource_gpt_hwmod);
+
+ __omap_dm_timer_load_start(&clksrc,
+ OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR,
+ omap2_gptimer_clksrc_load,
+ OMAP_TIMER_NONPOSTED);
+}
+
static void __init omap2_gptimer_clocksource_init(int gptimer_id,
const char *fck_source,
const char *property)
@@ -490,6 +513,15 @@ static void __init omap2_gptimer_clocksource_init(int gptimer_id,
res = omap_dm_timer_init_one(&clksrc, fck_source, property,
&clocksource_gpt.name,
OMAP_TIMER_NONPOSTED);
+
+ if (soc_is_am43xx()) {
+ clocksource_gpt.suspend = omap2_gptimer_clksrc_suspend;
+ clocksource_gpt.resume = omap2_gptimer_clksrc_resume;
+
+ clocksource_gpt_hwmod =
+ omap_hwmod_lookup(clocksource_gpt.name);
+ }
+
BUG_ON(res);
__omap_dm_timer_load_start(&clksrc,
--
1.9.1
--
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