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Thu, 05 Feb 2026 16:30:15 -0800 (PST) From: "Kevin Hilman (TI)" Date: Thu, 05 Feb 2026 16:29:57 -0800 Subject: [PATCH v2 3/3] pmdommain: add support system-wide resume latency constraints Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260205-topic-lpm-pmdomain-device-constraints-v2-3-61f7be7d35ac@baylibre.com> References: <20260205-topic-lpm-pmdomain-device-constraints-v2-0-61f7be7d35ac@baylibre.com> In-Reply-To: <20260205-topic-lpm-pmdomain-device-constraints-v2-0-61f7be7d35ac@baylibre.com> To: "Rafael J. Wysocki" , Ulf Hansson , linux-pm@vger.kernel.org Cc: Dhruva Gole , linux-kernel@vger.kernel.org X-Mailer: b4 0.15-dev-47773 X-Developer-Signature: v=1; a=openpgp-sha256; l=3111; i=khilman@baylibre.com; h=from:subject:message-id; bh=Lrz7PRjZrfxGJZGrfykrmYmJ95UQygKaDgQoqfbwJBg=; b=owEBbQKS/ZANAwAIAVk3GJrT+8ZlAcsmYgBphTYSpIjojiZfJLEYpkS/JqjvaZsb0vuBIrNia rdOG++dcB2JAjMEAAEIAB0WIQR7h0YOFpJ/qfW/8QxZNxia0/vGZQUCaYU2EgAKCRBZNxia0/vG ZUmFD/4gZrv07jo5HJE3PBf28gPvvrkH/2dEl99SJlKShBRdL5iM43LKZ4S3AdZf+P9P9VQYfxB xVqI1O52XCGXKM+ryoD7gvmCYv7Rwlfg/af3DuHe1DHy0KxDD/R6bAyx4RRYjzvaDM6OfVzuSur mz+7UKmmRHgGRu9d0ppvxs3UNwc5ZHiKwQiVY4DD5jzCoFO4Y1JrHZA+sZBxAraMIYxi0f9oRe3 IKM8lk1KF0Vp+PC0SQ+xlB/LbnfBelxk4U/+EAeZhw+5fEUMwUL7Ij/ae+fwnoi5p4dhNfRkYT6 8fjCtr8F6vubWJLKyilsSjJl9u3M+/pbh+ltCDMCn8rzLWKXz2XvOng36NoIsxS5p9EWK6dans2 lk5DWlcoMERSIS+QQ4nVjSfKUCqVqUcMEdSli5jeOOHJC+xZWBqsXeJYs2RXMuuKxJh0Hwvx1Bx Y/Iz6bBpXYfybPTxBGoKcUMvFXfRLhVDs2T/Dugm1KOHDm7W9VWAj41HYuDEFF6HIqAKAArnIbB 1wdrlsQ7xE5dvObubFOZa17+SxAw/IKk6vJ9yNXxt+z01eolCjNe3m8+fEDq8sti7y+RuF9frrO OBkOJ5bB9kmxOpLLjunI9Bn0AyJ0qZK6FgEiSk8j0784217tiQ9t+7Di3A+nfxIky7RZpP8AewX 5o6k+6WLxxjkHCA== X-Developer-Key: i=khilman@baylibre.com; a=openpgp; fpr=7B87460E16927FA9F5BFF10C5937189AD3FBC665 In addition to checking for CPU latency constraints when checking if OK to power down a domain, also check for QoS latency constraints in all devices of a domain and use that in determining the final latency constraint to use for the domain. Since cpu_system_power_down_ok() is used for system-wide suspend, the per-device constratints are only relevant if the LATENCY_SYS QoS flag is set. Signed-off-by: Kevin Hilman (TI) --- drivers/pmdomain/governor.c | 45 +++++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 45 insertions(+) diff --git a/drivers/pmdomain/governor.c b/drivers/pmdomain/governor.c index 96737abbb496..bbf59b93c8b6 100644 --- a/drivers/pmdomain/governor.c +++ b/drivers/pmdomain/governor.c @@ -13,6 +13,8 @@ #include #include =20 +#include "core.h" + static int dev_update_qos_constraint(struct device *dev, void *data) { s64 *constraint_ns_p =3D data; @@ -425,17 +427,60 @@ static bool cpu_power_down_ok(struct dev_pm_domain *p= d) return true; } =20 +/** + * check_device_qos_latency - Callback to check device QoS latency constra= ints + * @dev: Device to check + * @data: Pointer to s32 variable holding minimum latency found so far + * + * This callback checks if the device has a system-wide resume latency QoS + * constraint and updates the minimum latency if this device has a stricter + * constraint. + * + * Returns: 0 to continue iteration. + */ +static int check_device_qos_latency(struct device *dev, void *data) +{ + s32 *min_dev_latency =3D data; + enum pm_qos_flags_status flag_status; + s32 dev_latency; + + dev_latency =3D dev_pm_qos_read_value(dev, DEV_PM_QOS_RESUME_LATENCY); + flag_status =3D dev_pm_qos_flags(dev, PM_QOS_FLAG_LATENCY_SYS); + if ((dev_latency !=3D PM_QOS_RESUME_LATENCY_NO_CONSTRAINT) && + (flag_status =3D=3D PM_QOS_FLAGS_ALL)) { + dev_dbg(dev, + "has QoS system-wide resume latency=3D%d\n", + dev_latency); + if (dev_latency < *min_dev_latency) + *min_dev_latency =3D dev_latency; + } + + return 0; +} + static bool cpu_system_power_down_ok(struct dev_pm_domain *pd) { s64 constraint_ns =3D cpu_wakeup_latency_qos_limit() * NSEC_PER_USEC; struct generic_pm_domain *genpd =3D pd_to_genpd(pd); int state_idx =3D genpd->state_count - 1; + s32 min_dev_latency =3D PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; + s64 min_dev_latency_ns =3D PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; =20 if (!(genpd->flags & GENPD_FLAG_CPU_DOMAIN)) { genpd->state_idx =3D state_idx; return true; } =20 + genpd_for_each_child(genpd, check_device_qos_latency, + &min_dev_latency); + + /* If device latency < CPU wakeup latency, use it instead */ + if (min_dev_latency !=3D PM_QOS_RESUME_LATENCY_NO_CONSTRAINT) { + min_dev_latency_ns =3D min_dev_latency * NSEC_PER_USEC; + if (min_dev_latency_ns < constraint_ns) + constraint_ns =3D min_dev_latency_ns; + } + /* Find the deepest state for the latency constraint. */ while (state_idx >=3D 0) { s64 latency_ns =3D genpd->states[state_idx].power_off_latency_ns + --=20 2.51.0