49 lines
2.4 KiB
Diff
49 lines
2.4 KiB
Diff
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From faac973c82e73392c48e955574c283eaaf396758 Mon Sep 17 00:00:00 2001
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From: The-going <48602507+The-going@users.noreply.github.com>
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Date: Fri, 28 Jan 2022 14:18:17 +0300
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Subject: [PATCH 044/170] drv:clocksource:arm_arch_timer fix a64 timejump
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---
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drivers/clocksource/arm_arch_timer.c | 25 ++++++++++++++-----------
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1 file changed, 14 insertions(+), 11 deletions(-)
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diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
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index 9ab8221ee..e72f822d5 100644
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--- a/drivers/clocksource/arm_arch_timer.c
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+++ b/drivers/clocksource/arm_arch_timer.c
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@@ -364,17 +364,20 @@ static u64 notrace arm64_858921_read_cntvct_el0(void)
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* with all ones or all zeros in the low bits. Bound the loop by the maximum
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* number of CPU cycles in 3 consecutive 24 MHz counter periods.
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*/
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-#define __sun50i_a64_read_reg(reg) ({ \
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- u64 _val; \
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- int _retries = 150; \
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- \
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- do { \
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- _val = read_sysreg(reg); \
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- _retries--; \
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- } while (((_val + 1) & GENMASK(8, 0)) <= 1 && _retries); \
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- \
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- WARN_ON_ONCE(!_retries); \
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- _val; \
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+#define __sun50i_a64_read_reg(reg) ({ \
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+ register u64 _tries = 5, _old, _new; \
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+ \
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+ do { \
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+ if (unlikely(_tries < 3)) \
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+ isb(); \
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+ _old = read_sysreg(reg); \
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+ _new = read_sysreg(reg); \
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+ } while (unlikely((_new - _old) >> 4) && --_tries); \
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+ \
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+ if (unlikely(!_tries)) \
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+ pr_err("(cpu %d) returning possibly incorrect counter value %llx (%llx)\n", \
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+ smp_processor_id() + 1, _new, _old); \
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+ _new; \
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})
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static u64 notrace sun50i_a64_read_cntpct_el0(void)
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--
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2.35.3
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