linux-kernel - [PATCH 12/14] OMAP: CLK: CLKSRC: Add suspend resume hooks

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Date:   Thu, 12 Apr 2018 09:23:57 +0530
From:   Keerthy <j-keerthy@...com>
To:     <linus.walleij@...aro.org>, <grygorii.strashko@...com>,
        <tony@...mide.com>
CC:     <j-keerthy@...com>, <t-kristo@...com>, <Russ.Dill@...com>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <ssantosh@...nel.org>, <haojian.zhuang@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <d-gerlach@...com>
Subject: [PATCH 12/14] OMAP: CLK: CLKSRC: Add suspend resume hooks

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@...com>
---
 arch/arm/mach-omap2/timer.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 4fb4dc2..35fef97 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -442,6 +442,38 @@ 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)
+{
+	struct omap_hwmod *oh;
+
+	omap2_gptimer_clksrc_load =
+		__omap_dm_timer_read_counter(&clksrc, OMAP_TIMER_NONPOSTED);
+
+	oh = omap_hwmod_lookup(clocksource_gpt.name);
+	if (!oh)
+		return;
+
+	omap_hwmod_idle(oh);
+}
+
+static void omap2_gptimer_clksrc_resume(struct clocksource *unused)
+{
+	struct omap_hwmod *oh;
+
+	oh = omap_hwmod_lookup(clocksource_gpt.name);
+	if (!oh)
+		return;
+
+	omap_hwmod_enable(oh);
+
+	__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)
@@ -451,6 +483,11 @@ static void __init omap2_gptimer_clocksource_init(int gptimer_id,
 	clksrc.id = gptimer_id;
 	clksrc.errata = omap_dm_timer_get_errata();
 
+	if (soc_is_am43xx()) {
+		clocksource_gpt.suspend = omap2_gptimer_clksrc_suspend;
+		clocksource_gpt.resume = omap2_gptimer_clksrc_resume;
+	}
+
 	res = omap_dm_timer_init_one(&clksrc, fck_source, property,
 				     &clocksource_gpt.name,
 				     OMAP_TIMER_NONPOSTED);
-- 
1.9.1