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[7/7] clocksource: mips-gic-timer: Correct sched_clock width

Message ID 20240511-mips-clks-v1-7-ddb4a10ee9f9@flygoat.com (mailing list archive)
State Superseded
Headers show
Series MIPS: clocksource cumulative enhancements | expand

Commit Message

Jiaxun Yang May 11, 2024, 4 p.m. UTC 
Counter width of GIC is configurable and can be read from a
register.

Use width value from the register for sched_clock.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 drivers/clocksource/mips-gic-timer.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

Comments

Philippe Mathieu-Daudé May 27, 2024, 12:24 p.m. UTC | #1 
On 11/5/24 18:00, Jiaxun Yang wrote:
> Counter width of GIC is configurable and can be read from a
> register.
> 
> Use width value from the register for sched_clock.
> 
> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> ---
>   drivers/clocksource/mips-gic-timer.c | 14 +++++++-------
>   1 file changed, 7 insertions(+), 7 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
diff mbox series

Patch

diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index 67498dc9c5a5..47143e49fc44 100644
--- a/drivers/clocksource/mips-gic-timer.c
+++ b/drivers/clocksource/mips-gic-timer.c
@@ -19,6 +19,7 @@ 
 static DEFINE_PER_CPU(struct clock_event_device, gic_clockevent_device);
 static int gic_timer_irq;
 static unsigned int gic_frequency;
+static unsigned int gic_count_width;
 static bool __read_mostly gic_clock_unstable;
 
 static void gic_clocksource_unstable(char *reason);
@@ -186,15 +187,14 @@  static void gic_clocksource_unstable(char *reason)
 
 static int __init __gic_clocksource_init(void)
 {
-	unsigned int count_width;
 	int ret;
 
 	/* Set clocksource mask. */
-	count_width = read_gic_config() & GIC_CONFIG_COUNTBITS;
-	count_width >>= __ffs(GIC_CONFIG_COUNTBITS);
-	count_width *= 4;
-	count_width += 32;
-	gic_clocksource.mask = CLOCKSOURCE_MASK(count_width);
+	gic_count_width = read_gic_config() & GIC_CONFIG_COUNTBITS;
+	gic_count_width >>= __ffs(GIC_CONFIG_COUNTBITS);
+	gic_count_width *= 4;
+	gic_count_width += 32;
+	gic_clocksource.mask = CLOCKSOURCE_MASK(gic_count_width);
 
 	/* Calculate a somewhat reasonable rating value. */
 	if (mips_cm_revision() >= CM_REV_CM3 || !IS_ENABLED(CONFIG_CPU_FREQ))
@@ -264,7 +264,7 @@  static int __init gic_clocksource_of_init(struct device_node *node)
 	if (mips_cm_revision() >= CM_REV_CM3 || !IS_ENABLED(CONFIG_CPU_FREQ)) {
 		sched_clock_register(mips_cm_is64 ?
 				     gic_read_count_64 : gic_read_count_2x32,
-				     64, gic_frequency);
+				     gic_count_width, gic_frequency);
 	}
 
 	return 0;