linux-kernel - [PATCH v3 3/8] clocksource/drivers/tegra: Reset hardware state on init

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Message-Id: <20190524153253.28564-4-digetx@gmail.com>
Date:   Fri, 24 May 2019 18:32:48 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joseph Lo <josephl@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nicolas Chauvet <kwizart@...il.com>
Subject: [PATCH v3 3/8] clocksource/drivers/tegra: Reset hardware state on init

Reset timer's hardware state to ensure that initially it is in a
predictable state.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/clocksource/timer-tegra20.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clocksource/timer-tegra20.c b/drivers/clocksource/timer-tegra20.c
index 57e7aa2b80a3..739f83fdb318 100644
--- a/drivers/clocksource/timer-tegra20.c
+++ b/drivers/clocksource/timer-tegra20.c
@@ -132,6 +132,9 @@ static int tegra_timer_setup(unsigned int cpu)
 {
 	struct timer_of *to = per_cpu_ptr(&tegra_to, cpu);
 
+	writel(0, timer_of_base(to) + TIMER_PTV);
+	writel(TIMER_PCR_INTR_CLR, timer_of_base(to) + TIMER_PCR);
+
 	irq_force_affinity(to->clkevt.irq, cpumask_of(cpu));
 	enable_irq(to->clkevt.irq);
 
-- 
2.21.0