linux-kernel - [PATCH v2 5/7] cpufreq: apple-soc: Increase cluster switch timeout to 400us

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Message-ID: <20241212070344.3858-6-towinchenmi@gmail.com>
Date: Thu, 12 Dec 2024 15:03:04 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Hector Martin <marcan@...can.st>,
	Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Asahi Linux <asahi@...ts.linux.dev>,
	Linux ARM Kernel Architecture <linux-arm-kernel@...ts.infradead.org>,
	Linux power management <linux-pm@...r.kernel.org>,
	Devicetree <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Cc: Nick Chan <towinchenmi@...il.com>
Subject: [PATCH v2 5/7] cpufreq: apple-soc: Increase cluster switch timeout to 400us

Apple A11 SoC takes a long time to switch. Maximum switch time
observed is 345us, so increase the cluster switch timeout to 400us
to be safe.

Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
 drivers/cpufreq/apple-soc-cpufreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/apple-soc-cpufreq.c b/drivers/cpufreq/apple-soc-cpufreq.c
index b27d261fe5a6..94e57f055a5f 100644
--- a/drivers/cpufreq/apple-soc-cpufreq.c
+++ b/drivers/cpufreq/apple-soc-cpufreq.c
@@ -53,7 +53,7 @@
 #define APPLE_DVFS_PLL_FACTOR_MULT	GENMASK(31, 16)
 #define APPLE_DVFS_PLL_FACTOR_DIV	GENMASK(15, 0)
 
-#define APPLE_DVFS_TRANSITION_TIMEOUT 100
+#define APPLE_DVFS_TRANSITION_TIMEOUT 400
 
 struct apple_soc_cpufreq_info {
 	bool has_ps2;
-- 
2.47.1