From: Jules Maselbas <jmaselbas@kalray.eu>
To: barebox@lists.infradead.org
Cc: Jules Maselbas <jmaselbas@kalray.eu>
Subject: [PATCH 2/4] clock: Update cs->cycle_last when switching clock
Date: Thu, 25 Mar 2021 14:38:35 +0100 [thread overview]
Message-ID: <20210325133837.30866-2-jmaselbas@kalray.eu> (raw)
In-Reply-To: <20210325133837.30866-1-jmaselbas@kalray.eu>
If clocksource is free-running it might have been running for a while
before barebox started, we only care about the time spent in barebox.
We can discard the cycles accumulated before switching clocks by
updating cs->cycle_last with the cycles read for the new clock right
before switching.
Signed-off-by: Jules Maselbas <jmaselbas@kalray.eu>
---
common/clock.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/common/clock.c b/common/clock.c
index 58c2964b1..e30c81a37 100644
--- a/common/clock.c
+++ b/common/clock.c
@@ -222,6 +222,12 @@ int init_clock(struct clocksource *cs)
return ret;
}
+ /*
+ * If clocksource is freerunning it might have been running for a while
+ * before barebox started, we only care about the time spent in barebox
+ * thus we must discard the clocksource cycles up to this exact moment:
+ */
+ cs->cycle_last = cs->read() & cs->mask;
current_clock = cs;
time_beginning = get_time_ns();
--
2.17.1
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next prev parent reply other threads:[~2021-03-25 13:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 13:38 [PATCH 1/4] clock: Change cyc2ns return type to uint64_t Jules Maselbas
2021-03-25 13:38 ` Jules Maselbas [this message]
2021-03-25 13:38 ` [PATCH 3/4] clock: Remove time_beginning Jules Maselbas
2021-03-25 13:38 ` [PATCH 4/4] common: common_console: Rework log_print Jules Maselbas
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