Received-SPF: pass (google.com: domain of linux-kernel+bounces-211220-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249;
Feedback-ID: ifd894703:Fastmail
From: Jiaxun Yang <jiaxun.yang@flygoat.com>
Date: Wed, 12 Jun 2024 09:54:34 +0100
Subject: [PATCH v2 7/7] clocksource: mips-gic-timer: Correct sched_clock
 width
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
Message-Id: <20240612-mips-clks-v2-7-a57e6f49f3db@flygoat.com>
References: <20240612-mips-clks-v2-0-a57e6f49f3db@flygoat.com>
In-Reply-To: <20240612-mips-clks-v2-0-a57e6f49f3db@flygoat.com>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>, 
 Serge Semin <fancer.lancer@gmail.com>, 
 Daniel Lezcano <daniel.lezcano@linaro.org>, 
 Thomas Gleixner <tglx@linutronix.de>
Cc: "Maciej W. Rozycki" <macro@orcam.me.uk>, linux-mips@vger.kernel.org, 
 linux-kernel@vger.kernel.org, Jiaxun Yang <jiaxun.yang@flygoat.com>, 
 =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= <philmd@linaro.org>

Counter width of GIC is configurable and can be read from a
register.

Use width value from the register for sched_clock.

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

diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index 7a03d94c028a..110347707ff9 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;

-- 
2.43.0