On 02/03/2021 08:28, Fengquan Chen wrote: > 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
Remove the above. Add a Fixes tag. > Signed-off-by: Fengquan Chen <fengquan.c...@mediatek.com> > --- > 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)); SYST_CON_EN is set below, why do you have to do it before? Is that a hw bug ? It is confusing what the description of the SYST_CON_EN says: /* * SYST_CON_EN: Clock enable. Shall be set to * - Start timer countdown. * - Allow timeout ticks being updated. * - Allow changing interrupt functions. What means "interrupt functions" ? Does writing writel(SYST_CON_EN, SYST_CON_REG(to)) before SYST_CON_IRQ_CLR allows to clear the interrupt flag? Can you explain how the timer works regarding this part? It sounds to me a bit strange. * * SYST_CON_IRQ_EN: Set to allow interrupt. * * SYST_CON_IRQ_CLR: Set to clear interrupt. */ > 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))); > > -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog