From c8aac24629dec56334c27d98e993d2b3bb481b25 Mon Sep 17 00:00:00 2001 From: Gregory CLEMENT Date: Wed, 17 Apr 2019 11:48:45 +0200 Subject: [PATCH] arm: lpc32xx: Fix timer initialization The match controller register is not cleared during initialization. However, some bits of this register may reset the TC if tnMRx match it. As we can't make any assumption about how U-Boot is launched by the first stage bootloader (such as S1L) clearing this register ensure that the timers work as expected. Signed-off-by: Gregory CLEMENT --- arch/arm/cpu/arm926ejs/lpc32xx/timer.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/cpu/arm926ejs/lpc32xx/timer.c b/arch/arm/cpu/arm926ejs/lpc32xx/timer.c index 404ccbb..b3ca686 100644 --- a/arch/arm/cpu/arm926ejs/lpc32xx/timer.c +++ b/arch/arm/cpu/arm926ejs/lpc32xx/timer.c @@ -33,6 +33,9 @@ static void lpc32xx_timer_reset(struct timer_regs *timer, u32 freq) /* Set prescale counter value */ writel((get_periph_clk_rate() / freq) - 1, &timer->pr); + + /* Ensure that the counter is not reset when matching TC */ + writel(0, &timer->mcr); } static void lpc32xx_timer_count(struct timer_regs *timer, int enable) -- 2.7.4