Re: [PATCH v2 2/2] cpuidle: riscv-sbi: Add cpuidle_disabled() check

[Anup Patel]

On Wed, Aug 14, 2024 at 11:14 AM Nick Hu <nick.hu@xxxxxxxxxx> wrote:
>
> The consumer devices that inside the cpu/cluster power domain may register
> the genpd notifier where their power domains point to the pd nodes under
> '/cpus/power-domains'. If the cpuidle.off==1, the genpd notifier will fail
> due to sbi_cpuidle_pd_allow_domain_state is not set. We also need the
> sbi_cpuidle_cpuhp_up/down to invoke the callbacks. Therefore adding a
> cpuidle_disabled() check before cpuidle_register() to address the issue.
>
> Signed-off-by: Nick Hu <nick.hu@xxxxxxxxxx>

LGTM.

Reviewed-by: Anup Patel <anup@xxxxxxxxxxxxxx>

Regards,
Anup

> ---
>  drivers/cpuidle/cpuidle-riscv-sbi.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c
> index 98e7751dbfe8..3c8a509288f3 100644
> --- a/drivers/cpuidle/cpuidle-riscv-sbi.c
> +++ b/drivers/cpuidle/cpuidle-riscv-sbi.c
> @@ -25,6 +25,7 @@
>  #include <asm/smp.h>
>  #include <asm/suspend.h>
>
> +#include "cpuidle.h"
>  #include "dt_idle_states.h"
>  #include "dt_idle_genpd.h"
>
> @@ -336,6 +337,9 @@ static int sbi_cpuidle_init_cpu(struct device *dev, int cpu)
>                 return ret;
>         }
>
> +       if (cpuidle_disabled())
> +               return 0;
> +
>         ret = cpuidle_register(drv, NULL);
>         if (ret)
>                 goto deinit;
> @@ -548,7 +552,10 @@ static int sbi_cpuidle_probe(struct platform_device *pdev)
>         /* Setup CPU hotplut notifiers */
>         sbi_idle_init_cpuhp();
>
> -       pr_info("idle driver registered for all CPUs\n");
> +       if (cpuidle_disabled())
> +               pr_info("cpuidle is disabled\n");
> +       else
> +               pr_info("idle driver registered for all CPUs\n");
>
>         return 0;
>
> --
> 2.34.1
>