On 12/04/2021 05:22, Evan Benn wrote:
> Interrupts are disabled during suspend before this driver disables its
> timers. ARM trusted firmware will abort suspend if the timer irq is
> pending, so ack and disable the timer interrupt during suspend.
>
> Signed-off-by: Evan Benn <evanb...@chromium.org>
> ---
>
> Changes in v3:
> Move the ACK from the shutdown to the suspend function.
>
> Changes in v2:
> Remove the patch that splits the drivers into 2 files.
>
> drivers/clocksource/timer-mediatek.c | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/drivers/clocksource/timer-mediatek.c
> b/drivers/clocksource/timer-mediatek.c
> index 9318edcd8963..1ae8fee639bf 100644
> --- a/drivers/clocksource/timer-mediatek.c
> +++ b/drivers/clocksource/timer-mediatek.c
> @@ -241,6 +241,27 @@ static void mtk_gpt_enable_irq(struct timer_of *to, u8
> timer)
> timer_of_base(to) + GPT_IRQ_EN_REG);
> }
>
> +static void mtk_gpt_resume(struct clock_event_device *clk)
> +{
> + struct timer_of *to = to_timer_of(clk);
> +
> + mtk_gpt_enable_irq(to, TIMER_CLK_EVT);
> +}
> +
> +static void mtk_gpt_suspend(struct clock_event_device *clk)
> +{
> + struct timer_of *to = to_timer_of(clk);
> +
> + /* Disable all interrupts */
> + writel(0x0, timer_of_base(to) + GPT_IRQ_EN_REG);
> +
> + /* This is called with interrupts disabled,
Please fix the comment style:
/*
* This is called with interrupts disabled
* so ...
* ...
*/
Other than than that I'll be happy to pick it.
> + * so we need to ack any interrupt that is pending
> + * Or for example ATF will prevent a suspend from completing.
> + */
> + writel(0x3f, timer_of_base(to) + GPT_IRQ_ACK_REG);
> +}
> +
> static struct timer_of to = {
> .flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
>
> @@ -286,6 +307,8 @@ static int __init mtk_gpt_init(struct device_node *node)
> to.clkevt.set_state_oneshot = mtk_gpt_clkevt_shutdown;
> to.clkevt.tick_resume = mtk_gpt_clkevt_shutdown;
> to.clkevt.set_next_event = mtk_gpt_clkevt_next_event;
> + to.clkevt.suspend = mtk_gpt_suspend;
> + to.clkevt.resume = mtk_gpt_resume;
> to.of_irq.handler = mtk_gpt_interrupt;
>
> ret = timer_of_init(node, &to);
>
--
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