On Tuesday 13 June 2017 15:58:45, Dong Aisheng wrote:
> diff --git a/drivers/clocksource/timer-imx-tpm.c
> b/drivers/clocksource/timer-imx-tpm.c new file mode 100644
> index 0000000..940a4f75
> --- /dev/null
> +++ b/drivers/clocksource/timer-imx-tpm.c
> @@ -0,0 +1,227 @@
> [...]
> +static int tpm_set_next_event(unsigned long delta,
> + struct clock_event_device *evt)
> +{
> + unsigned long next, now;
> +
> + next = readl(timer_base + TPM_CNT) + delta;
> + writel(next, timer_base + TPM_C0V);
> + now = readl(timer_base + TPM_CNT);
What about:
> now = readl(timer_base + TPM_CNT);
> next = now + delta;
> writel(next, timer_base + TPM_C0V);
> return 0;
> + return (int)((next - now) <= 0) ? -ETIME : 0;
Can this error actually happen, even with your implementation?
Best regards,
Alexander
