[PATCH] clocksource/drivers/timer-mediatek: optimize systimer irq clear flow on Mediatek Socs
From: Fengquan Chen <hidden>
Date: 2021-03-02 08:36:28
Also in:
linux-mediatek, lkml
Subsystem:
clocksource, clockevent drivers, the rest · Maintainers:
Daniel Lezcano, Thomas Gleixner, Linus Torvalds
1)ensure systimer is enabled before clear and disable interrupt, which only for systimer in Mediatek Socs. 2)clear any pending timer-irq when shutdown to keep suspend flow clean, when use systimer as tick-broadcast timer Change-Id: Ia3eda83324af2fdaf5cbb3569a9bf020a11f8009 Signed-off-by: Fengquan Chen <redacted> --- drivers/clocksource/timer-mediatek.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/clocksource/timer-mediatek.c b/drivers/clocksource/timer-mediatek.c
index 9318edc..9f1f095dc 100644
--- a/drivers/clocksource/timer-mediatek.c
+++ b/drivers/clocksource/timer-mediatek.c@@ -75,6 +75,7 @@ static void mtk_syst_ack_irq(struct timer_of *to) { /* Clear and disable interrupt */ + writel(SYST_CON_EN, SYST_CON_REG(to)); writel(SYST_CON_IRQ_CLR | SYST_CON_EN, SYST_CON_REG(to)); }
@@ -111,6 +112,9 @@ static int mtk_syst_clkevt_next_event(unsigned long ticks, static int mtk_syst_clkevt_shutdown(struct clock_event_device *clkevt) { + /* Clear any irq */ + mtk_syst_ack_irq(to_timer_of(clkevt)); + /* Disable timer */ writel(0, SYST_CON_REG(to_timer_of(clkevt)));
--
1.8.1.1.dirty
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