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([59.188.211.160]) by smtp.googlemail.com with ESMTPSA id d9443c01a7336-218a1dcb3ffsm79202565ad.75.2024.12.18.10.29.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Dec 2024 10:29:14 -0800 (PST) From: Nick Chan To: Hector Martin , Sven Peter , Alyssa Rosenzweig , "Rafael J . Wysocki" , Viresh Kumar , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Asahi Linux , Linux ARM Kernel Architecture , Linux power management , Devicetree , LKML Cc: Nick Chan Subject: [PATCH v3 5/7] cpufreq: apple-soc: Increase cluster switch timeout to 400us Date: Thu, 19 Dec 2024 02:25:07 +0800 Message-ID: <20241218182834.22334-6-towinchenmi@gmail.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241218182834.22334-1-towinchenmi@gmail.com> References: <20241218182834.22334-1-towinchenmi@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241218_102915_529255_4C92FAF0 X-CRM114-Status: GOOD ( 11.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- 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;