linux-kernel - Re: [PATCH 20/41] clocksource: sh_cmt: Migrate to new 'set-state' interface

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Message-ID: <7799171.e5nEbff1LY@avalon>
Date:	Thu, 18 Jun 2015 16:10:18 +0300
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Magnus Damm <damm+renesas@...nsource.se>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 20/41] clocksource: sh_cmt: Migrate to new 'set-state' interface

Hi Viresh,

Thank you for the patch.

On Thursday 18 June 2015 16:24:34 Viresh Kumar wrote:
> Migrate sh_cmt driver to the new 'set-state' interface provided by
> clockevents core, the earlier 'set-mode' interface is marked obsolete
> now.
> 
> This also enables us to implement callbacks for new states of clockevent
> devices, for example: ONESHOT_STOPPED.
> 
> Cc: Magnus Damm <damm+renesas@...nsource.se>
> Cc: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> Cc: Paul Mundt <lethal@...ux-sh.org>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

Acked-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>

> ---
>  drivers/clocksource/sh_cmt.c | 62 ++++++++++++++++++++--------------------
>  1 file changed, 31 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
> index b8ff3c64cc45..855f42a2c64b 100644
> --- a/drivers/clocksource/sh_cmt.c
> +++ b/drivers/clocksource/sh_cmt.c
> @@ -538,7 +538,7 @@ static irqreturn_t sh_cmt_interrupt(int irq, void
> *dev_id)
> 
>  	if (ch->flags & FLAG_CLOCKEVENT) {
>  		if (!(ch->flags & FLAG_SKIPEVENT)) {
> -			if (ch->ced.mode == CLOCK_EVT_MODE_ONESHOT) {
> +			if (clockevent_state_oneshot(&ch->ced)) {
>  				ch->next_match_value = ch->max_match_value;
>  				ch->flags |= FLAG_REPROGRAM;
>  			}
> @@ -554,7 +554,7 @@ static irqreturn_t sh_cmt_interrupt(int irq, void
> *dev_id) sh_cmt_clock_event_program_verify(ch, 1);
> 
>  		if (ch->flags & FLAG_CLOCKEVENT)
> -			if ((ch->ced.mode == CLOCK_EVT_MODE_SHUTDOWN)
> +			if ((clockevent_state_shutdown(&ch->ced))
> 
>  			    || (ch->match_value == ch->next_match_value))
> 
>  				ch->flags &= ~FLAG_REPROGRAM;
>  	}
> @@ -720,39 +720,37 @@ static void sh_cmt_clock_event_start(struct
> sh_cmt_channel *ch, int periodic) sh_cmt_set_next(ch, ch->max_match_value);
>  }
> 
> -static void sh_cmt_clock_event_mode(enum clock_event_mode mode,
> -				    struct clock_event_device *ced)
> +static int sh_cmt_clock_event_shutdown(struct clock_event_device *ced)
> +{
> +	struct sh_cmt_channel *ch = ced_to_sh_cmt(ced);
> +
> +	sh_cmt_stop(ch, FLAG_CLOCKEVENT);
> +	return 0;
> +}
> +
> +static int sh_cmt_clock_event_set_state(struct clock_event_device *ced,
> +					int periodic)
>  {
>  	struct sh_cmt_channel *ch = ced_to_sh_cmt(ced);
> 
>  	/* deal with old setting first */
> -	switch (ced->mode) {
> -	case CLOCK_EVT_MODE_PERIODIC:
> -	case CLOCK_EVT_MODE_ONESHOT:
> +	if (clockevent_state_oneshot(ced) || clockevent_state_periodic(ced))
>  		sh_cmt_stop(ch, FLAG_CLOCKEVENT);
> -		break;
> -	default:
> -		break;
> -	}
> 
> -	switch (mode) {
> -	case CLOCK_EVT_MODE_PERIODIC:
> -		dev_info(&ch->cmt->pdev->dev,
> -			 "ch%u: used for periodic clock events\n", ch->index);
> -		sh_cmt_clock_event_start(ch, 1);
> -		break;
> -	case CLOCK_EVT_MODE_ONESHOT:
> -		dev_info(&ch->cmt->pdev->dev,
> -			 "ch%u: used for oneshot clock events\n", ch->index);
> -		sh_cmt_clock_event_start(ch, 0);
> -		break;
> -	case CLOCK_EVT_MODE_SHUTDOWN:
> -	case CLOCK_EVT_MODE_UNUSED:
> -		sh_cmt_stop(ch, FLAG_CLOCKEVENT);
> -		break;
> -	default:
> -		break;
> -	}
> +	dev_info(&ch->cmt->pdev->dev, "ch%u: used for %s clock events\n",
> +		 ch->index, periodic ? "periodic" : "oneshot");
> +	sh_cmt_clock_event_start(ch, periodic);
> +	return 0;
> +}
> +
> +static int sh_cmt_clock_event_set_oneshot(struct clock_event_device *ced)
> +{
> +	return sh_cmt_clock_event_set_state(ced, 0);
> +}
> +
> +static int sh_cmt_clock_event_set_periodic(struct clock_event_device *ced)
> +{
> +	return sh_cmt_clock_event_set_state(ced, 1);
>  }
> 
>  static int sh_cmt_clock_event_next(unsigned long delta,
> @@ -760,7 +758,7 @@ static int sh_cmt_clock_event_next(unsigned long delta,
>  {
>  	struct sh_cmt_channel *ch = ced_to_sh_cmt(ced);
> 
> -	BUG_ON(ced->mode != CLOCK_EVT_MODE_ONESHOT);
> +	BUG_ON(!clockevent_state_oneshot(ced));
>  	if (likely(ch->flags & FLAG_IRQCONTEXT))
>  		ch->next_match_value = delta - 1;
>  	else
> @@ -814,7 +812,9 @@ static int sh_cmt_register_clockevent(struct
> sh_cmt_channel *ch, ced->rating = 125;
>  	ced->cpumask = cpu_possible_mask;
>  	ced->set_next_event = sh_cmt_clock_event_next;
> -	ced->set_mode = sh_cmt_clock_event_mode;
> +	ced->set_state_shutdown = sh_cmt_clock_event_shutdown;
> +	ced->set_state_periodic = sh_cmt_clock_event_set_periodic;
> +	ced->set_state_oneshot = sh_cmt_clock_event_set_oneshot;
>  	ced->suspend = sh_cmt_clock_event_suspend;
>  	ced->resume = sh_cmt_clock_event_resume;

-- 
Regards,

Laurent Pinchart

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