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Date:   Sat, 12 Dec 2020 12:58:50 -0000
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Subject: [tip: timers/core] clocksource/drivers/arm_arch_timer: Use stable
 count reader in erratum sne
Cc:     Marc Zyngier <maz@kernel.org>, Keqian Zhu <zhukeqian1@huawei.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>, x86@kernel.org,
        linux-kernel@vger.kernel.org
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The following commit has been merged into the timers/core branch of tip:

Commit-ID:     d8cc3905b8073c7cfbff94af889fa8dc71f21dd5
Gitweb:        https://git.kernel.org/tip/d8cc3905b8073c7cfbff94af889fa8dc71f21dd5
Author:        Keqian Zhu <zhukeqian1@huawei.com>
AuthorDate:    Fri, 04 Dec 2020 15:31:25 +08:00
Committer:     Daniel Lezcano <daniel.lezcano@linaro.org>
CommitterDate: Sat, 05 Dec 2020 19:33:55 +01:00

clocksource/drivers/arm_arch_timer: Use stable count reader in erratum sne

In commit 0ea415390cd3 ("clocksource/arm_arch_timer: Use arch_timer_read_counter
to access stable counters"), we separate stable and normal count reader to omit
unnecessary overhead on systems that have no timer erratum.

However, in erratum_set_next_event_tval_generic(), count reader becomes normal
reader. This converts it to stable reader.

Fixes: 0ea415390cd3 ("clocksource/arm_arch_timer: Use arch_timer_read_counter to access stable counters")
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20201204073126.6920-2-zhukeqian1@huawei.com
---
 drivers/clocksource/arm_arch_timer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 6c3e841..777d38c 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -396,10 +396,10 @@ static void erratum_set_next_event_tval_generic(const int access, unsigned long 
 	ctrl &= ~ARCH_TIMER_CTRL_IT_MASK;
 
 	if (access == ARCH_TIMER_PHYS_ACCESS) {
-		cval = evt + arch_counter_get_cntpct();
+		cval = evt + arch_counter_get_cntpct_stable();
 		write_sysreg(cval, cntp_cval_el0);
 	} else {
-		cval = evt + arch_counter_get_cntvct();
+		cval = evt + arch_counter_get_cntvct_stable();
 		write_sysreg(cval, cntv_cval_el0);
 	}