linux-kernel - Re: [PATCH v4 21/24] arm/v2m: initialize arch_timers even if v2m

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Date:	Mon, 07 Jan 2013 17:32:20 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	Pawel Moll <Pawel.Moll@....com>, "arnd@...db.de" <arnd@...db.de>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Tim (Xen.org)" <tim@....org>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 21/24] arm/v2m: initialize arch_timers even if v2m_timer
 is not present

On 07/01/13 17:21, Stefano Stabellini wrote:
> On Fri, 14 Sep 2012, Stefano Stabellini wrote:
>> On Fri, 14 Sep 2012, Pawel Moll wrote:
>>> On Fri, 2012-09-14 at 12:13 +0100, Stefano Stabellini wrote:
>>>> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
>>>> CC: Russell King <linux@....linux.org.uk>
>>>> CC: Pawel Moll <pawel.moll@....com>
>>>> CC: Marc Zyngier <marc.zyngier@....com>
>>>> ---
>>>>  arch/arm/mach-vexpress/v2m.c |   11 ++++++-----
>>>>  1 files changed, 6 insertions(+), 5 deletions(-)
>>>>
>>>> diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c
>>>> index 37608f2..4e567f7 100644
>>>> --- a/arch/arm/mach-vexpress/v2m.c
>>>> +++ b/arch/arm/mach-vexpress/v2m.c
>>>> @@ -621,16 +621,17 @@ static void __init v2m_dt_timer_init(void)
>>>>  
>>>>  	v2m_clk_init();
>>>>  
>>>> -	err = of_property_read_string(of_aliases, "arm,v2m_timer", &path);
>>>> -	if (WARN_ON(err))
>>>> -		return;
>>>> -	node = of_find_node_by_path(path);
>>>> -	v2m_sp804_init(of_iomap(node, 0), irq_of_parse_and_map(node, 0));
>>>>  	if (arch_timer_of_register() != 0)
>>>>  		twd_local_timer_of_register();
>>>>  
>>>>  	if (arch_timer_sched_clock_init() != 0)
>>>>  		versatile_sched_clock_init(v2m_sysreg_base + V2M_SYS_24MHZ, 24000000);
>>>> +
>>>> +	err = of_property_read_string(of_aliases, "arm,v2m_timer", &path);
>>>> +	if (WARN_ON(err))
>>>> +		return;
>>>> +	node = of_find_node_by_path(path);
>>>> +	v2m_sp804_init(of_iomap(node, 0), irq_of_parse_and_map(node, 0));
>>>>  }
>>>>  
>>>>  static struct sys_timer v2m_dt_timer = {
>>>
>>> Fair point. The alias is going to disappear anyway (I'm working on a VE
>>> platform rework right now), but in case I won't get it on time for 3.7,
>>> I'll make sure this one is merged instead.
>>
>> Great, thanks!
>> Should I leave this patch out of the Xen on ARM series for 3.7 then?
>>
> 
> I have just noticed that this patch hasn't been merged yet, but still we
> need it to boot Linux on Xen.
> Do you want me to rebase and resent?

I'm looking at v3.8-rc2, and the code have changed significantly (see
433683a66401adb0150792e725cc4f631c94de46).

If you don't have an "arm,sp804" device in your DT, it shouldn't get
registered and carry on registering the per-cpu timers. Can you check
that it fixes your issue?

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...

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