linux-kernel - [PATCH v1] cpuidle: driver: Update microsecond values of state parameters as needed

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Date:   Tue, 07 Feb 2023 20:59:59 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PM <linux-pm@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Subject: [PATCH v1] cpuidle: driver: Update microsecond values of state parameters as needed

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

If the cpuidle driver provides the target residency and exit latency in
nanoseconds, the corresponding values in microseconds need to be set to
reflect the provided numbers in order for the sysfs interface to show
them correctly, so make __cpuidle_driver_init() do that.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/cpuidle/driver.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-pm/drivers/cpuidle/driver.c
===================================================================
--- linux-pm.orig/drivers/cpuidle/driver.c
+++ linux-pm/drivers/cpuidle/driver.c
@@ -183,11 +183,15 @@ static void __cpuidle_driver_init(struct
 			s->target_residency_ns = s->target_residency * NSEC_PER_USEC;
 		else if (s->target_residency_ns < 0)
 			s->target_residency_ns = 0;
+		else
+			s->target_residency = s->target_residency_ns / NSEC_PER_USEC;
 
 		if (s->exit_latency > 0)
 			s->exit_latency_ns = s->exit_latency * NSEC_PER_USEC;
 		else if (s->exit_latency_ns < 0)
 			s->exit_latency_ns =  0;
+		else
+			s->exit_latency = s->exit_latency_ns / NSEC_PER_USEC;
 	}
 }