| From 51b1edb2e3af7fc16e3c6d1e91eba33e0e79d4fe Mon Sep 17 00:00:00 2001 |
| From: Nicolai Stange <nicstange@gmail.com> |
| Date: Thu, 30 Mar 2017 22:09:12 +0200 |
| Subject: [PATCH 111/286] clockevents/drivers/sh_cmt: Set ->min_delta_ticks and |
| ->max_delta_ticks |
| |
| In preparation for making the clockevents core NTP correction aware, |
| all clockevent device drivers must set ->min_delta_ticks and |
| ->max_delta_ticks rather than ->min_delta_ns and ->max_delta_ns: a |
| clockevent device's rate is going to change dynamically and thus, the |
| ratio of ns to ticks ceases to stay invariant. |
| |
| Make the sh_cmt clockevent driver initialize these fields properly. |
| |
| This patch alone doesn't introduce any change in functionality as the |
| clockevents core still looks exclusively at the (untouched) ->min_delta_ns |
| and ->max_delta_ns. As soon as this has changed, a followup patch will |
| purge the initialization of ->min_delta_ns and ->max_delta_ns from this |
| driver. |
| |
| Cc: Ingo Molnar <mingo@redhat.com> |
| Cc: Thomas Gleixner <tglx@linutronix.de> |
| Cc: Daniel Lezcano <daniel.lezcano@linaro.org> |
| Cc: Richard Cochran <richardcochran@gmail.com> |
| Cc: Prarit Bhargava <prarit@redhat.com> |
| Cc: Stephen Boyd <sboyd@codeaurora.org> |
| Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> |
| Signed-off-by: Nicolai Stange <nicstange@gmail.com> |
| Signed-off-by: John Stultz <john.stultz@linaro.org> |
| (cherry picked from commit bb2e94ac0cf4628f5e5f778c8de4a376dac43558) |
| Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
| --- |
| drivers/clocksource/sh_cmt.c | 2 ++ |
| 1 file changed, 2 insertions(+) |
| |
| --- a/drivers/clocksource/sh_cmt.c |
| +++ b/drivers/clocksource/sh_cmt.c |
| @@ -815,7 +815,9 @@ static int sh_cmt_register_clockevent(st |
| ced->shift = 32; |
| ced->mult = div_sc(ch->cmt->rate, NSEC_PER_SEC, ced->shift); |
| ced->max_delta_ns = clockevent_delta2ns(ch->max_match_value, ced); |
| + ced->max_delta_ticks = ch->max_match_value; |
| ced->min_delta_ns = clockevent_delta2ns(0x1f, ced); |
| + ced->min_delta_ticks = 0x1f; |
| |
| dev_info(&ch->cmt->pdev->dev, "ch%u: used for clock events\n", |
| ch->index); |
