Hi,
On Fri, Jan 17, 2025, at 18:02, Nick Chan wrote:
> The CPU PMU in Apple SoCs can be configured to fire its interrupt in one
> of several ways, and since Apple A11 one of the method is FIQ. Only handle
> the PMC interrupt as a FIQ when the CPU PMU has been configured to fire
> FIQs.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: c7708816c944 ("irqchip/apple-aic: Wire PMU interrupts")
> Signed-off-by: Nick Chan <towinchenmi@xxxxxxxxx>
> ---
> drivers/irqchip/irq-apple-aic.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/irqchip/irq-apple-aic.c
> b/drivers/irqchip/irq-apple-aic.c
> index da5250f0155c..c3d435103d6d 100644
> --- a/drivers/irqchip/irq-apple-aic.c
> +++ b/drivers/irqchip/irq-apple-aic.c
> @@ -577,7 +577,8 @@ static void __exception_irq_entry
> aic_handle_fiq(struct pt_regs *regs)
> AIC_FIQ_HWIRQ(AIC_TMR_EL02_VIRT));
> }
>
> - if (read_sysreg_s(SYS_IMP_APL_PMCR0_EL1) & PMCR0_IACT) {
> + if (read_sysreg_s(SYS_IMP_APL_PMCR0_EL1) &
> + (FIELD_PREP(PMCR0_IMODE, PMCR0_IMODE_FIQ) | PMCR0_IACT)) {
That's a somewhat unusual way to use FIELD_PREP and I'm not sure the
expression even does what you want. It's true when only PMCR0_IACT is set and
your commit description mentions that you only when to handle these when
FIQ have been configured. Am I missing something here?
Best,
Sven
