linux-kernel - [PATCH 5.4 16/57] clocksource/drivers/timer-gx6605s: Fixup counter reload

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Date:   Mon,  5 Oct 2020 17:26:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>,
        Xu Kai <xukai@...ionalchip.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 16/57] clocksource/drivers/timer-gx6605s: Fixup counter reload

From: Guo Ren <guoren@...ux.alibaba.com>

[ Upstream commit bc6717d55d07110d8f3c6d31ec2af50c11b07091 ]

When the timer counts to the upper limit, an overflow interrupt is
generated, and the count is reset with the value in the TIME_INI
register. But the software expects to start counting from 0 when
the count overflows, so it forces TIME_INI to 0 to solve the
potential interrupt storm problem.

Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Tested-by: Xu Kai <xukai@...ionalchip.com>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Link: https://lore.kernel.org/r/1597735877-71115-1-git-send-email-guoren@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clocksource/timer-gx6605s.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clocksource/timer-gx6605s.c b/drivers/clocksource/timer-gx6605s.c
index 80d0939d040b5..8d386adbe8009 100644
--- a/drivers/clocksource/timer-gx6605s.c
+++ b/drivers/clocksource/timer-gx6605s.c
@@ -28,6 +28,7 @@ static irqreturn_t gx6605s_timer_interrupt(int irq, void *dev)
 	void __iomem *base = timer_of_base(to_timer_of(ce));
 
 	writel_relaxed(GX6605S_STATUS_CLR, base + TIMER_STATUS);
+	writel_relaxed(0, base + TIMER_INI);
 
 	ce->event_handler(ce);
 
-- 
2.25.1