linux-kernel - [RFC PATCH 06/10] clocksource: arm_arch_timer: Register the persistent clock

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Message-Id: <f7f053cc1ffbef881642bc8755f0d73b370b0d36.1526285602.git.baolin.wang@linaro.org>
Date:   Mon, 14 May 2018 16:55:32 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     tglx@...utronix.de, john.stultz@...aro.org,
        daniel.lezcano@...aro.org, arnd@...db.de, tony@...mide.com,
        aaro.koskinen@....fi, linux@...linux.org.uk, mark.rutland@....com,
        marc.zyngier@....com
Cc:     baolin.wang@...aro.org, broonie@...nel.org,
        paulmck@...ux.vnet.ibm.com, mlichvar@...hat.com,
        rdunlap@...radead.org, kstewart@...uxfoundation.org,
        gregkh@...uxfoundation.org, pombredanne@...b.com,
        thierry.reding@...il.com, jonathanh@...dia.com, heiko@...ech.de,
        linus.walleij@...aro.org, viresh.kumar@...aro.org,
        mingo@...nel.org, hpa@...or.com, peterz@...radead.org,
        douly.fnst@...fujitsu.com, len.brown@...el.com,
        rajvi.jingar@...el.com, alexandre.belloni@...tlin.com,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: [RFC PATCH 06/10] clocksource: arm_arch_timer: Register the persistent clock

Register the persistent clock to compensate the suspend time for OS time,
if the ARM counter clocksource will not be stopped in suspend state.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/clocksource/Kconfig          |    1 +
 drivers/clocksource/arm_arch_timer.c |   10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index d7dddcc..884719c 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -308,6 +308,7 @@ config ARC_TIMERS_64BIT
 
 config ARM_ARCH_TIMER
 	bool
+	select PERSISTENT_CLOCK
 	select TIMER_OF if OF
 	select TIMER_ACPI if ACPI
 
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 57cb2f0..671be63 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -32,6 +32,7 @@
 #include <asm/virt.h>
 
 #include <clocksource/arm_arch_timer.h>
+#include <linux/persistent_clock.h>
 
 #undef pr_fmt
 #define pr_fmt(fmt) "arch_timer: " fmt
@@ -950,6 +951,15 @@ static void __init arch_counter_register(unsigned type)
 
 	/* 56 bits minimum, so we assume worst case rollover */
 	sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate);
+
+	/*
+	 * Register the persistent clock if the clocksource will not be stopped
+	 * in suspend state.
+	 */
+	if (!arch_counter_suspend_stop)
+		persistent_clock_init_and_register(arch_timer_read_counter,
+						   CLOCKSOURCE_MASK(56),
+						   arch_timer_rate, 0);
 }
 
 static void arch_timer_stop(struct clock_event_device *clk)
-- 
1.7.9.5