linux-kernel - Re: [GIT PULL RESEND] clocksource/clockevents fixes for 3.13

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Date:	Tue, 10 Dec 2013 15:31:42 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Dinh Nguyen <dinguyen@...era.com>, Ingo Molnar <mingo@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Axel Lin <axel.lin@...ics.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Thierry Reding <thierry.reding@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL RESEND] clocksource/clockevents fixes for 3.13

On 12/10/2013 03:21 PM, Dinh Nguyen wrote:
> On Tue, 2013-12-10 at 14:41 +0100, Ingo Molnar wrote:
>> * Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>>
>>>
>>> Hi Thomas, Ingo,
>>>
>>> here are the fixes for 3.13 based on timers/urgent
>>>
>>>   * Axel Lin added a missing dependency on CLKSRC_MMIO in the Kconfig
>>> for the time-efm32.
>>>
>>>   * Dinh Nguyen fixed read_sched_clock to return the right value for
>>> the dw_apb_timer.
>>>
>>>   * Ezequiel Garcia registered the sched clock after the counter,
>>> thus preventing time jump in the traces for the armada-370-xp.
>>>
>>>   * Marc Zyngier stopped the timer before enabling the irq in order
>>> to prevent it to be fired before the clockevent is registered for
>>> the sunxi.
>>>
>>>   * Thierry Reding removed a of_node_put in clksrc-of because the
>>> reference is not held.
>>
>> (For future reference, please post all patches not just a combo
>> patch.)
>>
>>> Dinh Nguyen (2):
>>>        clocksource: dw_apb_timer: Move timer defines to header file.
>>>        clocksource: dw_apb_timer_of: Fix read_sched_clock
>>
>> Nit: we generally don't use periods at the end of titles, it looks
>> inconsistent in shortlogs.
>>
>>> diff --git a/drivers/clocksource/dw_apb_timer.c
>>> b/drivers/clocksource/dw_apb_timer.c
>>> index e54ca10..c3a8f52 100644
>>> --- a/drivers/clocksource/dw_apb_timer.c
>>> +++ b/drivers/clocksource/dw_apb_timer.c
>>> @@ -18,25 +18,6 @@
>>>   #include <linux/io.h>
>>>   #include <linux/slab.h>
>>>
>>> -#define APBT_MIN_PERIOD			4
>>> -#define APBT_MIN_DELTA_USEC		200
>>> -
>>> -#define APBTMR_N_LOAD_COUNT		0x00
>>> -#define APBTMR_N_CURRENT_VALUE		0x04
>>> -#define APBTMR_N_CONTROL		0x08
>>> -#define APBTMR_N_EOI			0x0c
>>> -#define APBTMR_N_INT_STATUS		0x10
>>> -
>>> -#define APBTMRS_INT_STATUS		0xa0
>>> -#define APBTMRS_EOI			0xa4
>>> -#define APBTMRS_RAW_INT_STATUS		0xa8
>>> -#define APBTMRS_COMP_VERSION		0xac
>>> -
>>> -#define APBTMR_CONTROL_ENABLE		(1 << 0)
>>> -/* 1: periodic, 0:free running. */
>>> -#define APBTMR_CONTROL_MODE_PERIODIC	(1 << 1)
>>> -#define APBTMR_CONTROL_INT		(1 << 2)
>>> -
>>>   static inline struct dw_apb_clock_event_device *
>>>   ced_to_dw_apb_ced(struct clock_event_device *evt)
>>>   {
>>> diff --git a/drivers/clocksource/dw_apb_timer_of.c
>>> b/drivers/clocksource/dw_apb_timer_of.c
>>> index 45ba8ae..c3fe17e 100644
>>> --- a/drivers/clocksource/dw_apb_timer_of.c
>>> +++ b/drivers/clocksource/dw_apb_timer_of.c
>>> @@ -102,18 +102,17 @@ static void __init add_clocksource(struct
>>> device_node *source_timer)
>>>   	 * timer is found. sched_io_base then points to the current_value
>>>   	 * register of the clocksource timer.
>>>   	 */
>>> -	sched_io_base = iobase + 0x04;
>>> +	sched_io_base = iobase;
>>>   	sched_rate = rate;
>>>   }
>>>
>>>   static u64 read_sched_clock(void)
>>>   {
>>> -	return __raw_readl(sched_io_base);
>>> +	return ~__raw_readl(sched_io_base + APBTMR_N_CURRENT_VALUE);
>>
>> AFAICS the minimal fix here for v3.13 would be to just do:
>>
>>> -	return __raw_readl(sched_io_base);
>>> +	return ~__raw_readl(sched_io_base);
>>
>> Right? That way the fix is just a oneliner and we could delay the
>> header file and magic-constants use cleanups to v3.14.
>
> Yes. That will be fine. Do you need me to send a new patch that does
> just that?

Yes, please.


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