linux-kernel - [tip: timers/core] clocksource/drivers/arm_global

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Date: Mon, 18 Mar 2024 10:07:38 -0000
From: "tip-bot2 for Martin Blumenstingl" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 Daniel Lezcano <daniel.lezcano@...aro.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: timers/core] clocksource/drivers/arm_global_timer: Fix maximum
 prescaler value

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     b34b9547cee41575a4fddf390f615570759dc999
Gitweb:        https://git.kernel.org/tip/b34b9547cee41575a4fddf390f615570759dc999
Author:        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
AuthorDate:    Sun, 18 Feb 2024 18:41:37 +01:00
Committer:     Daniel Lezcano <daniel.lezcano@...aro.org>
CommitterDate: Mon, 19 Feb 2024 00:48:54 +01:00

clocksource/drivers/arm_global_timer: Fix maximum prescaler value

The prescaler in the "Global Timer Control Register bit assignments" is
documented to use bits [15:8], which means that the maximum prescaler
register value is 0xff.

Fixes: 171b45a4a70e ("clocksource/drivers/arm_global_timer: Implement rate compensation whenever source clock changes")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Link: https://lore.kernel.org/r/20240218174138.1942418-2-martin.blumenstingl@googlemail.com
---
 drivers/clocksource/arm_global_timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c
index 44a61dc..e1c773b 100644
--- a/drivers/clocksource/arm_global_timer.c
+++ b/drivers/clocksource/arm_global_timer.c
@@ -32,7 +32,7 @@
 #define GT_CONTROL_IRQ_ENABLE		BIT(2)	/* banked */
 #define GT_CONTROL_AUTO_INC		BIT(3)	/* banked */
 #define GT_CONTROL_PRESCALER_SHIFT      8
-#define GT_CONTROL_PRESCALER_MAX        0xF
+#define GT_CONTROL_PRESCALER_MAX        0xFF
 #define GT_CONTROL_PRESCALER_MASK       (GT_CONTROL_PRESCALER_MAX << \
 					 GT_CONTROL_PRESCALER_SHIFT)