linux-kernel - [PATCH v1 1/2] clocksource/drivers/arm_global

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Date: Sun, 18 Feb 2024 18:41:37 +0100
From: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To: daniel.lezcano@...aro.org,
	tglx@...utronix.de
Cc: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	andrea.merello@...il.com,
	patrice.chotard@...s.st.com,
	linux-amlogic@...ts.infradead.org,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH v1 1/2] 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>
---
 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 44a61dc6f932..e1c773bb5535 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)
 
-- 
2.43.2