On Mon, 26 Feb 2024 at 07:51, Nick Hu <nick.hu@xxxxxxxxxx> wrote:
When the cpus in the same cluster are all in the idle state, the kernel
might put the cluster into a deeper low power state. Call the
cluster_pm_enter() before entering the low power state and call the
cluster_pm_exit() after the cluster woken up.
Signed-off-by: Nick Hu <nick.hu@xxxxxxxxxx>
I was not cced this patch, but noticed that this patch got queued up
recently. Sorry for not noticing earlier.
If not too late, can you please drop/revert it? We should really move
away from the CPU cluster notifiers. See more information below.
---
drivers/cpuidle/cpuidle-riscv-sbi.c | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c
index e8094fc92491..298dc76a00cf 100644
--- a/drivers/cpuidle/cpuidle-riscv-sbi.c
+++ b/drivers/cpuidle/cpuidle-riscv-sbi.c
@@ -394,6 +394,7 @@ static int sbi_cpuidle_pd_power_off(struct generic_pm_domain *pd)
{
struct genpd_power_state *state = &pd->states[pd->state_idx];
u32 *pd_state;
+ int ret;
if (!state->data)
return 0;
@@ -401,6 +402,10 @@ static int sbi_cpuidle_pd_power_off(struct generic_pm_domain *pd)
if (!sbi_cpuidle_pd_allow_domain_state)
return -EBUSY;
+ ret = cpu_cluster_pm_enter();
+ if (ret)
+ return ret;
Rather than using the CPU cluster notifiers, consumers of the genpd
can register themselves to receive genpd on/off notifiers.
In other words, none of this should be needed, right?
[...]
Kind regards
Uffe