linux-kernel - [RESEND][PATCH 1/3] clocksource/drivers/timer-microchip-pit64b: remove suspend/resume ops for ce

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Message-ID: <20220609094041.1796372-2-claudiu.beznea@microchip.com>
Date:   Thu, 9 Jun 2022 12:40:39 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <daniel.lezcano@...aro.org>, <tglx@...utronix.de>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [RESEND][PATCH 1/3] clocksource/drivers/timer-microchip-pit64b: remove suspend/resume ops for ce

Remove suspend and resume ops for clockevent and add set_state_oneshot()
instead. Along with this mchp_pit64b_{suspend, resume}() were called on
proper function to disable/enable clocks. This will allow disabling clocks
for clockevent in case it is not selected as active clockevent.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/clocksource/timer-microchip-pit64b.c | 30 +++++++++++---------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/clocksource/timer-microchip-pit64b.c b/drivers/clocksource/timer-microchip-pit64b.c
index abce83d2f00b..b51259395ac3 100644
--- a/drivers/clocksource/timer-microchip-pit64b.c
+++ b/drivers/clocksource/timer-microchip-pit64b.c
@@ -173,7 +173,8 @@ static int mchp_pit64b_clkevt_shutdown(struct clock_event_device *cedev)
 {
 	struct mchp_pit64b_timer *timer = clkevt_to_mchp_pit64b_timer(cedev);
 
-	writel_relaxed(MCHP_PIT64B_CR_SWRST, timer->base + MCHP_PIT64B_CR);
+	if (!clockevent_state_detached(cedev))
+		mchp_pit64b_suspend(timer);
 
 	return 0;
 }
@@ -182,35 +183,37 @@ static int mchp_pit64b_clkevt_set_periodic(struct clock_event_device *cedev)
 {
 	struct mchp_pit64b_timer *timer = clkevt_to_mchp_pit64b_timer(cedev);
 
+	if (clockevent_state_shutdown(cedev))
+		mchp_pit64b_resume(timer);
+
 	mchp_pit64b_reset(timer, mchp_pit64b_ce_cycles, MCHP_PIT64B_MR_CONT,
 			  MCHP_PIT64B_IER_PERIOD);
 
 	return 0;
 }
 
-static int mchp_pit64b_clkevt_set_next_event(unsigned long evt,
-					     struct clock_event_device *cedev)
+static int mchp_pit64b_clkevt_set_oneshot(struct clock_event_device *cedev)
 {
 	struct mchp_pit64b_timer *timer = clkevt_to_mchp_pit64b_timer(cedev);
 
-	mchp_pit64b_reset(timer, evt, MCHP_PIT64B_MR_ONE_SHOT,
+	if (clockevent_state_shutdown(cedev))
+		mchp_pit64b_resume(timer);
+
+	mchp_pit64b_reset(timer, mchp_pit64b_ce_cycles, MCHP_PIT64B_MR_ONE_SHOT,
 			  MCHP_PIT64B_IER_PERIOD);
 
 	return 0;
 }
 
-static void mchp_pit64b_clkevt_suspend(struct clock_event_device *cedev)
+static int mchp_pit64b_clkevt_set_next_event(unsigned long evt,
+					     struct clock_event_device *cedev)
 {
 	struct mchp_pit64b_timer *timer = clkevt_to_mchp_pit64b_timer(cedev);
 
-	mchp_pit64b_suspend(timer);
-}
-
-static void mchp_pit64b_clkevt_resume(struct clock_event_device *cedev)
-{
-	struct mchp_pit64b_timer *timer = clkevt_to_mchp_pit64b_timer(cedev);
+	mchp_pit64b_reset(timer, evt, MCHP_PIT64B_MR_ONE_SHOT,
+			  MCHP_PIT64B_IER_PERIOD);
 
-	mchp_pit64b_resume(timer);
+	return 0;
 }
 
 static irqreturn_t mchp_pit64b_interrupt(int irq, void *dev_id)
@@ -395,9 +398,8 @@ static int __init mchp_pit64b_init_clkevt(struct mchp_pit64b_timer *timer,
 	ce->clkevt.rating = 150;
 	ce->clkevt.set_state_shutdown = mchp_pit64b_clkevt_shutdown;
 	ce->clkevt.set_state_periodic = mchp_pit64b_clkevt_set_periodic;
+	ce->clkevt.set_state_oneshot = mchp_pit64b_clkevt_set_oneshot;
 	ce->clkevt.set_next_event = mchp_pit64b_clkevt_set_next_event;
-	ce->clkevt.suspend = mchp_pit64b_clkevt_suspend;
-	ce->clkevt.resume = mchp_pit64b_clkevt_resume;
 	ce->clkevt.cpumask = cpumask_of(0);
 	ce->clkevt.irq = irq;
 
-- 
2.34.1