From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: Re: [PATCH v2] omap: timer: Set dmtimer used as clocksource in autoreload mode Date: Wed, 10 Aug 2011 07:37:32 -0700 Message-ID: <20110810143732.GN1939@atomide.com> References: <1312982375-11848-1-git-send-email-hemantp@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1312982375-11848-1-git-send-email-hemantp@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: Hemant Pedanekar Cc: linux-omap@vger.kernel.org, Russell King , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org List-Id: linux-omap@vger.kernel.org * Hemant Pedanekar [110810 06:14]: > If CONFIG_OMAP_32K_TIMER is not selected and dmtimer is used as clocksource, the > timer stops counting once overflow occurs as it was not set in autoreload mode. > This results into timekeeping failure: for example, 'sleep 1' at the shell after > the timer counter overflow would hang. > > This patch sets up autoreload when starting the clocksource timer which fixes > the above issue. Thanks for updating this, will apply into fixes. Tony > > Signed-off-by: Hemant Pedanekar > --- > arch/arm/mach-omap2/timer.c | 3 ++- > 1 files changed, 2 insertions(+), 1 deletions(-) > > diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c > index e964072..cf1de7d 100644 > --- a/arch/arm/mach-omap2/timer.c > +++ b/arch/arm/mach-omap2/timer.c > @@ -293,7 +293,8 @@ static void __init omap2_gp_clocksource_init(int gptimer_id, > pr_info("OMAP clocksource: GPTIMER%d at %lu Hz\n", > gptimer_id, clksrc.rate); > > - __omap_dm_timer_load_start(clksrc.io_base, OMAP_TIMER_CTRL_ST, 0, 1); > + __omap_dm_timer_load_start(clksrc.io_base, > + OMAP_TIMER_CTRL_ST | OMAP_TIMER_CTRL_AR, 0, 1); > init_sched_clock(&cd, dmtimer_update_sched_clock, 32, clksrc.rate); > > if (clocksource_register_hz(&clocksource_gpt, clksrc.rate)) > -- > 1.7.3.5 >