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(h-178-174-189-39.A498.priv.bahnhof.se. [178.174.189.39]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-32fa29134d4sm21136211fa.22.2025.07.16.05.33.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Jul 2025 05:33:46 -0700 (PDT) From: Ulf Hansson To: "Rafael J . Wysocki" , linux-pm@vger.kernel.org Cc: Kevin Hilman , Pavel Machek , Len Brown , Daniel Lezcano , Saravana Kannan , Maulik Shah , Prasad Sodagudi , Ulf Hansson , linux-kernel@vger.kernel.org Subject: [RFC/PATCH 3/3] cpuidle: Respect the system-wakeup QoS limit for s2idle Date: Wed, 16 Jul 2025 14:33:19 +0200 Message-ID: <20250716123323.65441-4-ulf.hansson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250716123323.65441-1-ulf.hansson@linaro.org> References: <20250716123323.65441-1-ulf.hansson@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" A system-wakeup QoS limit may have been requested by user-space. To avoid entering a too deep state during s2idle, let's start to take into account the QoS limit when selecting a suitable low-power-state. Signed-off-by: Ulf Hansson --- drivers/cpuidle/cpuidle.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 0835da449db8..5f6dacb5b134 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -190,14 +190,15 @@ static noinstr void enter_s2idle_proper(struct cpuidl= e_driver *drv, */ int cpuidle_enter_s2idle(struct cpuidle_driver *drv, struct cpuidle_device= *dev) { + u64 constraint_ns =3D system_wakeup_latency_qos_limit() * NSEC_PER_USEC; int index; =20 /* - * Find the deepest state with ->enter_s2idle present, which guarantees - * that interrupts won't be enabled when it exits and allows the tick to - * be frozen safely. + * Find the deepest state with ->enter_s2idle present that meets the + * system-wakeup QoS limit, which guarantees that interrupts won't be + * enabled when it exits and allows the tick to be frozen safely. */ - index =3D find_deepest_state(drv, dev, U64_MAX, 0, true); + index =3D find_deepest_state(drv, dev, constraint_ns, 0, true); if (index > 0) { enter_s2idle_proper(drv, dev, index); local_irq_enable(); --=20 2.43.0