linux-kernel - Re: [patch 3/3] clockevent driver for arm/pxa2xx

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Date:	Fri, 19 Jan 2007 20:13:32 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Sascha Hauer <s.hauer@...gutronix.de>
cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu,
	Luotao Fu <lfu@...gutronix.de>
Subject: Re: [patch 3/3] clockevent driver for arm/pxa2xx

On Tue, 9 Jan 2007 s.hauer@...gutronix.de wrote:

> Add a clockevent driver for pxa systems. This patch also removes the pxa
> dyntick support since it is not necessary anymore with generic dynamic
> tick support
> 
> Signed-off-by: Luotao Fu <lfu@...gutronix.de>
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> 
> ---
>  arch/arm/mach-pxa/time.c |  106 ++++++++++++++++++++++-------------------------
>  1 file changed, 51 insertions(+), 55 deletions(-)
> 
> Index: arch/arm/mach-pxa/time.c
> ===================================================================
> --- a/arch/arm/mach-pxa/time.c.orig
> +++ b/arch/arm/mach-pxa/time.c
> @@ -19,6 +19,7 @@
>  #include <linux/errno.h>
>  #include <linux/sched.h>
>  #include <linux/clocksource.h>
> +#include <linux/clockchips.h>
>  
>  #include <asm/system.h>
>  #include <asm/hardware.h>
> @@ -29,6 +30,50 @@
>  #include <asm/mach/time.h>
>  #include <asm/arch/pxa-regs.h>
>  
> +static u32 clockevent_mode = 0;
> +
> +static void pxa_set_next_event(unsigned long evt,
> +				  struct clock_event_device *unused)
> +{
> +	OSMR0 = OSCR + evt;
> +}

This doesn't work for me in various nasty ways. Please, check for a 
minimum delay or loop to get ahead of time. See code in the "old" timer 
ISR. See how it unconditionally adds at least 10 ticks...

Thanks
Guennadi
---
Guennadi Liakhovetski
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