linux-kernel - [PATCH 07/25] clocksource/drivers/tegra: Reset hardware state on init

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Message-Id: <20190626144651.16742-7-daniel.lezcano@linaro.org>
Date:   Wed, 26 Jun 2019 16:46:33 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-tegra@...r.kernel.org (open list:TEGRA ARCHITECTURE SUPPORT)
Subject: [PATCH 07/25] clocksource/drivers/tegra: Reset hardware state on init

From: Dmitry Osipenko <digetx@...il.com>

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

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
Acked-By: Peter De Schrijver <pdeschrijver@...dia.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 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 acd68c77fa91..3e4f12aee8df 100644
--- a/drivers/clocksource/timer-tegra20.c
+++ b/drivers/clocksource/timer-tegra20.c
@@ -123,6 +123,9 @@ 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);
 
-- 
2.17.1