linux-kernel - [PATCH v1 1/3] ACPI: PM: s2idle: Drop acpi_get_lps0

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Message-ID: <5032801.GXAFRqVoOG@rafael.j.wysocki>
Date: Thu, 09 Oct 2025 21:25:56 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Linux ACPI <linux-acpi@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...r.kernel.org>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
 Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v1 1/3] ACPI: PM: s2idle: Drop acpi_get_lps0_constraint()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Drop unused function acpi_get_lps0_constraint().

No functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/x86/s2idle.c |   24 ------------------------
 include/linux/acpi.h      |    5 -----
 2 files changed, 29 deletions(-)

--- a/drivers/acpi/x86/s2idle.c
+++ b/drivers/acpi/x86/s2idle.c
@@ -299,30 +299,6 @@ free_acpi_buffer:
 	ACPI_FREE(out_obj);
 }
 
-/**
- * acpi_get_lps0_constraint - Get the LPS0 constraint for a device.
- * @adev: Device to get the constraint for.
- *
- * The LPS0 constraint is the shallowest (minimum) power state in which the
- * device can be so as to allow the platform as a whole to achieve additional
- * energy conservation by utilizing a system-wide low-power state.
- *
- * Returns:
- *  - ACPI power state value of the constraint for @adev on success.
- *  - Otherwise, ACPI_STATE_UNKNOWN.
- */
-int acpi_get_lps0_constraint(struct acpi_device *adev)
-{
-	struct lpi_constraints *entry;
-
-	for_each_lpi_constraint(entry) {
-		if (adev->handle == entry->handle)
-			return entry->min_dstate;
-	}
-
-	return ACPI_STATE_UNKNOWN;
-}
-
 static void lpi_check_constraints(void)
 {
 	struct lpi_constraints *entry;
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1157,12 +1157,7 @@ struct acpi_s2idle_dev_ops {
 #if defined(CONFIG_SUSPEND) && defined(CONFIG_X86)
 int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg);
 void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg);
-int acpi_get_lps0_constraint(struct acpi_device *adev);
 #else /* CONFIG_SUSPEND && CONFIG_X86 */
-static inline int acpi_get_lps0_constraint(struct device *dev)
-{
-	return ACPI_STATE_UNKNOWN;
-}
 static inline int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg)
 {
 	return -ENODEV;