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riscv_mtimer: modify riscv_mtimer_current to reduce precision lost

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Signed-off-by: liaoao <liaoao@xiaomi.com>
This commit is contained in:
liaoao
2024-03-07 16:07:25 +08:00
committed by archer
parent 339457dda3
commit 512a496467
1 changed files with 4 additions and 3 deletions
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arch/risc-v/src/common/riscv_mtimer.c
+4 -3
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@@ -319,10 +319,11 @@ static int riscv_mtimer_current(struct oneshot_lowerhalf_s *lower,
struct riscv_mtimer_lowerhalf_s *priv = struct riscv_mtimer_lowerhalf_s *priv =
(struct riscv_mtimer_lowerhalf_s *)lower; (struct riscv_mtimer_lowerhalf_s *)lower;
uint64_t mtime = riscv_mtimer_get_mtime(priv); uint64_t mtime = riscv_mtimer_get_mtime(priv);
uint64_t nsec = mtime / (priv->freq / USEC_PER_SEC) * NSEC_PER_USEC; uint64_t left;
ts->tv_sec = nsec / NSEC_PER_SEC; ts->tv_sec = mtime / priv->freq;
ts->tv_nsec = nsec % NSEC_PER_SEC; left = mtime - ts->tv_sec * priv->freq;
ts->tv_nsec = NSEC_PER_SEC * left / priv->freq;
return 0; return 0;
} }