linux-kernel - [PATCH v2 1/3] PM / QoS: add flag to indicate latency applies system-wide

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Message-Id: <20260205-topic-lpm-pmdomain-device-constraints-v2-1-61f7be7d35ac@baylibre.com>
Date: Thu, 05 Feb 2026 16:29:55 -0800
From: "Kevin Hilman (TI)" <khilman@...libre.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Ulf Hansson <ulf.hansson@...aro.org>, linux-pm@...r.kernel.org
Cc: Dhruva Gole <d-gole@...com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] PM / QoS: add flag to indicate latency applies
 system-wide

By default, the QoS resume latency currenly only applied to runtime PM
decisions.

Add new PM_QOS_FLAG_LATENCY_SYS flag to indicate that the
resume latency QoS constraint should be applied to system-wide
PM *in addition to* runtime PM.

Signed-off-by: Kevin Hilman (TI) <khilman@...libre.com>
---
 include/linux/pm_qos.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index 6cea4455f867..aededda52b6b 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -37,6 +37,8 @@ enum pm_qos_flags_status {
 #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT	(-1)

 #define PM_QOS_FLAG_NO_POWER_OFF	(1 << 0)
+/* latency value applies to system-wide suspend/s2idle */
+#define PM_QOS_FLAG_LATENCY_SYS		(2 << 0)

 enum pm_qos_type {
 	PM_QOS_UNITIALIZED,

-- 
2.51.0