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From: Krzysztof Kozlowski <krzk@kernel.org>
To: Sylwester Nawrocki <s.nawrocki@samsung.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Russell King <linux@armlinux.org.uk>,
	Olof Johansson <olof@lixom.net>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: [PATCH 2/2] ARM: multi_v7_defconfig: Enable Exynos bus and memory frequency scaling (devfreq)
Date: Fri,  4 Oct 2019 17:00:40 +0200	[thread overview]
Message-ID: <20191004150040.5833-2-krzk@kernel.org> (raw)
In-Reply-To: <20191004150040.5833-1-krzk@kernel.org>

Enable devfreq events along with drivers for scaling frequency and
voltages of Exynos buses and Dynamic Memory Controller (DMC).  This
usually brings energy saving benefits.

So far devfreq was disabled because it was causing hangs during system
reboot (voltage not matching reset frequency). This was already fixed.

Occasionally, devfreq might negatively impact performance of certain SoC
blocks, e.g. when a bus is scaled down but some block (like Mixer with
two Full HD windows) wants to perform high-throughput DMA operations.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 arch/arm/configs/multi_v7_defconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
index 7f7978dba8ab..1296e7aaa801 100644
--- a/arch/arm/configs/multi_v7_defconfig
+++ b/arch/arm/configs/multi_v7_defconfig
@@ -977,11 +977,14 @@ CONFIG_ARCH_TEGRA_2x_SOC=y
 CONFIG_ARCH_TEGRA_3x_SOC=y
 CONFIG_ARCH_TEGRA_114_SOC=y
 CONFIG_ARCH_TEGRA_124_SOC=y
+CONFIG_ARM_EXYNOS_BUS_DEVFREQ=m
 CONFIG_ARM_TEGRA_DEVFREQ=m
+CONFIG_DEVFREQ_EVENT_EXYNOS_NOCP=m
 CONFIG_EXTCON_MAX14577=m
 CONFIG_EXTCON_MAX77693=m
 CONFIG_EXTCON_MAX8997=m
 CONFIG_TI_AEMIF=y
+CONFIG_EXYNOS5422_DMC=m
 CONFIG_IIO=y
 CONFIG_IIO_SW_TRIGGER=y
 CONFIG_ASPEED_ADC=m
-- 
2.17.1

WARNING: multiple messages have this Message-ID (diff)
From: Krzysztof Kozlowski <krzk@kernel.org>
To: Sylwester Nawrocki <s.nawrocki@samsung.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Russell King <linux@armlinux.org.uk>,
	Olof Johansson <olof@lixom.net>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: [PATCH 2/2] ARM: multi_v7_defconfig: Enable Exynos bus and memory frequency scaling (devfreq)
Date: Fri,  4 Oct 2019 17:00:40 +0200	[thread overview]
Message-ID: <20191004150040.5833-2-krzk@kernel.org> (raw)
In-Reply-To: <20191004150040.5833-1-krzk@kernel.org>

Enable devfreq events along with drivers for scaling frequency and
voltages of Exynos buses and Dynamic Memory Controller (DMC).  This
usually brings energy saving benefits.

So far devfreq was disabled because it was causing hangs during system
reboot (voltage not matching reset frequency). This was already fixed.

Occasionally, devfreq might negatively impact performance of certain SoC
blocks, e.g. when a bus is scaled down but some block (like Mixer with
two Full HD windows) wants to perform high-throughput DMA operations.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 arch/arm/configs/multi_v7_defconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
index 7f7978dba8ab..1296e7aaa801 100644
--- a/arch/arm/configs/multi_v7_defconfig
+++ b/arch/arm/configs/multi_v7_defconfig
@@ -977,11 +977,14 @@ CONFIG_ARCH_TEGRA_2x_SOC=y
 CONFIG_ARCH_TEGRA_3x_SOC=y
 CONFIG_ARCH_TEGRA_114_SOC=y
 CONFIG_ARCH_TEGRA_124_SOC=y
+CONFIG_ARM_EXYNOS_BUS_DEVFREQ=m
 CONFIG_ARM_TEGRA_DEVFREQ=m
+CONFIG_DEVFREQ_EVENT_EXYNOS_NOCP=m
 CONFIG_EXTCON_MAX14577=m
 CONFIG_EXTCON_MAX77693=m
 CONFIG_EXTCON_MAX8997=m
 CONFIG_TI_AEMIF=y
+CONFIG_EXYNOS5422_DMC=m
 CONFIG_IIO=y
 CONFIG_IIO_SW_TRIGGER=y
 CONFIG_ASPEED_ADC=m
-- 
2.17.1


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  reply	other threads:[~2019-10-04 15:00 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-04 15:00 [PATCH 1/2] ARM: multi_v7_defconfig: Enable options for boards with Exynos SoC Krzysztof Kozlowski
2019-10-04 15:00 ` Krzysztof Kozlowski
2019-10-04 15:00 ` Krzysztof Kozlowski [this message]
2019-10-04 15:00   ` [PATCH 2/2] ARM: multi_v7_defconfig: Enable Exynos bus and memory frequency scaling (devfreq) Krzysztof Kozlowski
2019-10-07  7:05 ` [PATCH 1/2] ARM: multi_v7_defconfig: Enable options for boards with Exynos SoC Krzysztof Kozlowski
2019-10-07  7:05   ` Krzysztof Kozlowski

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