linux-kernel - [PATCH 18/25] clocksource/drivers/tegra: Set and use timer's period

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Message-Id: <20190626144651.16742-18-daniel.lezcano@linaro.org>
Date:   Wed, 26 Jun 2019 16:46:44 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, Dmitry Osipenko <digetx@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Thierry Reding <treding@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-tegra@...r.kernel.org (open list:TEGRA ARCHITECTURE SUPPORT)
Subject: [PATCH 18/25] clocksource/drivers/tegra: Set and use timer's period

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

The of_clk structure has a period field that is set up initially by
timer_of_clk_init(), that period value need to be adjusted for a case of
TIMER1-9 that are running at a fixed rate that doesn't match the clock's
rate. Note that the period value is currently used only by some of the
clocksource drivers internally and hence this is just a minor cleanup
change that doesn't fix anything.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
Acked-by: Jon Hunter <jonathanh@...dia.com>
Acked-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/timer-tegra.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/timer-tegra.c b/drivers/clocksource/timer-tegra.c
index f172a57cc5fe..41257f89a216 100644
--- a/drivers/clocksource/timer-tegra.c
+++ b/drivers/clocksource/timer-tegra.c
@@ -73,9 +73,9 @@ static int tegra_timer_shutdown(struct clock_event_device *evt)
 static int tegra_timer_set_periodic(struct clock_event_device *evt)
 {
 	void __iomem *reg_base = timer_of_base(to_timer_of(evt));
+	unsigned long period = timer_of_period(to_timer_of(evt));
 
-	writel_relaxed(TIMER_PTV_EN | TIMER_PTV_PER |
-		       ((timer_of_rate(to_timer_of(evt)) / HZ) - 1),
+	writel_relaxed(TIMER_PTV_EN | TIMER_PTV_PER | (period - 1),
 		       reg_base + TIMER_PTV);
 
 	return 0;
@@ -299,6 +299,7 @@ static int __init tegra_init_timer(struct device_node *np, bool tegra20,
 		cpu_to->clkevt.rating = rating;
 		cpu_to->clkevt.cpumask = cpumask_of(cpu);
 		cpu_to->of_base.base = timer_reg_base + base;
+		cpu_to->of_clk.period = rate / HZ;
 		cpu_to->of_clk.rate = rate;
 
 		irq_set_status_flags(cpu_to->clkevt.irq, IRQ_NOAUTOEN);
-- 
2.17.1