linux-kernel - Re: [PATCH 2/2] cpuidle: riscv-sbi: Fix code to allow a genpd governor to be used

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Date:   Sat, 14 May 2022 22:17:20 +0530
From:   Anup Patel <anup@...infault.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Maulik Shah <quic_mkshah@...cinc.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Atish Patra <atishp@...osinc.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] cpuidle: riscv-sbi: Fix code to allow a genpd
 governor to be used

On Sat, May 14, 2022 at 8:50 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> The intent is to use a genpd governor when there are some states that needs
> to be managed. Although, the current code ends up to never assign a
> governor, let's fix this.
>
> Fixes: 6abf32f1d9c50 ("cpuidle: Add RISC-V SBI CPU idle driver")
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>

Looks good to me. I have tested this on QEMU RISC-V as well.

Reviewed-by: Anup Patel <anup@...infault.org>
Tested-by: Anup Patel <anup@...infault.org>

Thanks,
Anup

> ---
>  drivers/cpuidle/cpuidle-riscv-sbi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c
> index b459eda2cd37..478970fa3b0c 100644
> --- a/drivers/cpuidle/cpuidle-riscv-sbi.c
> +++ b/drivers/cpuidle/cpuidle-riscv-sbi.c
> @@ -413,7 +413,7 @@ static int sbi_pd_init(struct device_node *np)
>         struct generic_pm_domain *pd;
>         struct sbi_pd_provider *pd_provider;
>         struct dev_power_governor *pd_gov;
> -       int ret = -ENOMEM, state_count = 0;
> +       int ret = -ENOMEM;
>
>         pd = dt_idle_pd_alloc(np, sbi_dt_parse_state_node);
>         if (!pd)
> @@ -432,7 +432,7 @@ static int sbi_pd_init(struct device_node *np)
>                 pd->flags |= GENPD_FLAG_ALWAYS_ON;
>
>         /* Use governor for CPU PM domains if it has some states to manage. */
> -       pd_gov = state_count > 0 ? &pm_domain_cpu_gov : NULL;
> +       pd_gov = pd->states ? &pm_domain_cpu_gov : NULL;
>
>         ret = pm_genpd_init(pd, pd_gov, false);
>         if (ret)
> --
> 2.25.1
>