Re: [PATCH 1/6] arm64: dts: qcom: sm8250: drop incorrect domain idle states properties

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On 29/03/2023 12:45, Ulf Hansson wrote:
On Wed, 29 Mar 2023 at 00:51, Dmitry Baryshkov
<dmitry.baryshkov@xxxxxxxxxx> wrote:

On 24/03/2023 09:38, Krzysztof Kozlowski wrote:
Domain idle states do not use 'idle-state-name' and 'local-timer-stop':

    sm8250-hdk.dtb: domain-idle-states: cluster-sleep-0: 'idle-state-name', 'local-timer-stop' do not match any of the regexes: 'pinctrl-[0-9]+'

Reported-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Link: https://lore.kernel.org/all/20230323-topic-sm8450-upstream-dt-bindings-fixes-v1-4-3ead1e418fe4@xxxxxxxxxx/
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
---
   arch/arm64/boot/dts/qcom/sm8250.dtsi | 2 --
   1 file changed, 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi b/arch/arm64/boot/dts/qcom/sm8250.dtsi
index 79d67b466856..9cf2de87c632 100644
--- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
@@ -354,12 +354,10 @@ BIG_CPU_SLEEP_0: cpu-sleep-1-0 {
               domain-idle-states {
                       CLUSTER_SLEEP_0: cluster-sleep-0 {
                               compatible = "domain-idle-state";
-                             idle-state-name = "cluster-llcc-off";
                               arm,psci-suspend-param = <0x4100c244>;
                               entry-latency-us = <3264>;
                               exit-latency-us = <6562>;
                               min-residency-us = <9987>;
-                             local-timer-stop;

Hmm, so we support setting the broadcast timer when using plain PSCI
idle states, but not when using the domain-based idle states.

Ulf, Rafael, Daniel, is that an omission for the domain-based idle
support? Or is it handled in some other way?

I am not sure that we need a DT binding specifically for this, or do we?

So far, the timer is managed from platform specific code. For some
Qcom based platforms, the timer should be managed in
rpmh_rsc_write_next_wakeup(), which makes use of
dev_pm_genpd_get_next_hrtimer().

I'm not sure whether I fully follow this (I might lack some understanding here). I thought that with "local-timer-stop" (well, CPUIDLE_FLAG_TIMER_STOP), we were switching to the broadcast timer before a core/cluster goes into idle state with no local timer, while with rpmh_rsc_write_next_wakeup() we write that only before shutting down the last core (see the comment at rpmh_flush()).

This might be an expected thing, I probably don't have enough understanding of the cpuidle internals to judge this.


[...]

Kind regards
Uffe

--
With best wishes
Dmitry




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