linux-kernel - Re: [PATCH 3/5] clocksource: rockchip: add dynamic irq flag to the timer

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Date:	Tue, 31 May 2016 21:45:51 +0800
From:	"Huang, Tao" <huangtao@...k-chips.com>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Caesar Wang <wxt@...k-chips.com>,
	Heiko Stuebner <heiko@...ech.de>
Cc:	dianders@...omium.org, briannorris@...gle.com, smbarber@...gle.com,
	linux-rockchip@...ts.infradead.org,
	Thomas Gleixner <tglx@...utronix.de>, cf@...k-chips.com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/5] clocksource: rockchip: add dynamic irq flag to the
 timer

Hi Daniel:
On 2016年05月31日 07:16, Daniel Lezcano wrote:
> On 05/25/2016 11:50 AM, Caesar Wang wrote:
>> From: Huang Tao <huangtao@...k-chips.com>
>>
>> The rockchip timer is broadcast timer. Add CLOCK_EVT_FEAT_DYNIRQ
>> flag and set cpumask to all cpu to save power by avoid unnecessary
>> wakeups and IPIs.
>>
>> Signed-off-by: Huang Tao <huangtao@...k-chips.com>
>> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Heiko Stuebner <heiko@...ech.de>
>> Tested-by: Jianqun Xu <jay.xu@...k-chips.com>
>> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
>> ---
>>
>>   drivers/clocksource/rockchip_timer.c | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
>> index b93fed6..f3dfb1a 100644
>> --- a/drivers/clocksource/rockchip_timer.c
>> +++ b/drivers/clocksource/rockchip_timer.c
>> @@ -150,12 +150,13 @@ static void __init rk_timer_init(struct device_node *np)
>>   	}
>>
>>   	ce->name = TIMER_NAME;
>> -	ce->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
>> +	ce->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
>> +		       CLOCK_EVT_FEAT_DYNIRQ;
>>   	ce->set_next_event = rk_timer_set_next_event;
>>   	ce->set_state_shutdown = rk_timer_shutdown;
>>   	ce->set_state_periodic = rk_timer_set_periodic;
>>   	ce->irq = irq;
>> -	ce->cpumask = cpumask_of(0);
>> +	ce->cpumask = cpu_all_mask;
> 
> s/cpu_all_mask/cpu_possible_mask/

Okay for me.
It seems drivers in drivers/clocksource are very confusing about use
cpu_all_mask or cpu_possible_mask. For example arm_arch_timer.c use
cpu_all_mask, while mtk_timer.c use cpu_possible_mask. I think all just
work.

Thanks,
Huang, Tao