Hello,
Any comments or suggests on this? That would be very appreciated.
Thanks,
Chunyan
On Mon, Apr 13, 2020 at 5:09 PM <zhang.lyra@xxxxxxxxx> wrote:
>
> From: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx>
>
> Add a new flag CPUIDLE_FLAG_S2IDLE to allow c-state to be found as
> deepest state for s2idle only, so that users can add a new c-state
> for using s2idle and don't worry disturbing other use cases such as
> play_idle() which probably don't want to enter into so much deep
> idle state since devices are not suspended for that kind of cases.
>
> Signed-off-by: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx>
> ---
> drivers/cpuidle/cpuidle.c | 3 ++-
> drivers/cpuidle/dt_idle_states.c | 3 +++
> include/linux/cpuidle.h | 1 +
> 3 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
> index de81298051b3..bb61f0c271d2 100644
> --- a/drivers/cpuidle/cpuidle.c
> +++ b/drivers/cpuidle/cpuidle.c
> @@ -89,7 +89,8 @@ static int find_deepest_state(struct cpuidle_driver *drv,
> s->exit_latency_ns <= latency_req ||
> s->exit_latency_ns > max_latency_ns ||
> (s->flags & forbidden_flags) ||
> - (s2idle && !s->enter_s2idle))
> + (s2idle && !s->enter_s2idle) ||
> + (!s2idle && (s->flags & CPUIDLE_FLAG_S2ILDE)))
> continue;
>
> latency_req = s->exit_latency_ns;
> diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
> index 252f2a9686a6..530db2726c05 100644
> --- a/drivers/cpuidle/dt_idle_states.c
> +++ b/drivers/cpuidle/dt_idle_states.c
> @@ -80,6 +80,9 @@ static int init_state_node(struct cpuidle_state *idle_state,
> idle_state->flags = 0;
> if (of_property_read_bool(state_node, "local-timer-stop"))
> idle_state->flags |= CPUIDLE_FLAG_TIMER_STOP;
> +
> + if (of_property_read_bool(state_node, "for-s2idle-only"))
> + idle_state->flags |= CPUIDLE_FLAG_S2ILDE;
> /*
> * TODO:
> * replace with kstrdup and pointer assignment when name
> diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
> index ec2ef63771f0..08da701f74cd 100644
> --- a/include/linux/cpuidle.h
> +++ b/include/linux/cpuidle.h
> @@ -78,6 +78,7 @@ struct cpuidle_state {
> #define CPUIDLE_FLAG_TIMER_STOP BIT(2) /* timer is stopped on this state */
> #define CPUIDLE_FLAG_UNUSABLE BIT(3) /* avoid using this state */
> #define CPUIDLE_FLAG_OFF BIT(4) /* disable this state by default */
> +#define CPUIDLE_FLAG_S2ILDE BIT(5) /* state is used for s2idle only */
>
> struct cpuidle_device_kobj;
> struct cpuidle_state_kobj;
> --
> 2.20.1
>
