On Thu, 8 Jun 2023 at 10:56, Tushar Nimkar <quic_tnimkar@xxxxxxxxxxx> wrote: > > CPUidle already has CPUIDLE_FLAG_OFF to keep idle state disabled, > Lets extend the support to set this flag using device tree. > > This allows to keep an idle state disabled and they can be enabled back using > sysfs after certain point using below command. > > echo N > /sys/devices/system/cpu/cpuX/cpuidle/stateX/disable > > This helps in cases where vendors want to keep cpuidle off until home > screen comes up. In the past attempt was done at [1] but it was not considered > safe option to export cpu_idle_poll_ctrl(). > > [1] https://patchwork.kernel.org/project/linux-arm-msm/patch/1637831676-32737-1-git-send-email-quic_mkshah@xxxxxxxxxxx/ Before considering this, I don't recall if I ever received a reply to my earlier suggestion to the above thread. So, let me repeat my question. I am wondering if a similar improvement can be achieved by modularizing the cpuidle-psci driver. If insmodding it after the homescreen, we allow only ARM WFI during boot. This should achieve the similar results as we get with $subject series, right? [...] > > Thanks, > Tushar Nimkar. > > Tushar Nimkar (2): > dt-bindings: cpu: idle-states: Add idle-state-disabled property > cpuidle: dt: Add support to keep idle state disabled > > Documentation/devicetree/bindings/cpu/idle-states.yaml | 8 ++++++++ > drivers/cpuidle/dt_idle_states.c | 3 +++ > 2 files changed, 11 insertions(+) > Kind regards Uffe
