From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
To: Chanwoo Choi <cw00.choi@samsung.com>,
myungjoo.ham@samsung.com, kyungmin.park@samsung.com,
kgene@kernel.org, s.nawrocki@samsung.com, tomasz.figa@gmail.com
Cc: rjw@rjwysocki.net, robh+dt@kernel.org, pawel.moll@arm.com,
mark.rutland@arm.com, ijc+devicetree@hellion.org.uk,
galak@codeaurora.org, linux@arm.linux.org.uk,
linux.amoon@gmail.com, m.reichl@fivetechno.de,
tjakobi@math.uni-bielefeld.de, inki.dae@samsung.com,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
linux-samsung-soc@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v9 05/20] PM / devfreq: Add new passive governor
Date: Tue, 12 Apr 2016 09:30:34 +0200 [thread overview]
Message-ID: <570CA41A.5050500@samsung.com> (raw)
In-Reply-To: <1460347078-15175-6-git-send-email-cw00.choi@samsung.com>
On 04/11/2016 05:57 AM, Chanwoo Choi wrote:
> This patch adds the new passive governor for DEVFREQ framework. The following
> governors are already present and used for DVFS (Dynamic Voltage and Frequency
> Scaling) drivers. The following governors are independently used for one device
> driver which don't give the influence to other device drviers and also don't
> receive the effect from other device drivers.
> - ondemand / performance / powersave / userspace
>
> The passive governor depends on operation of parent driver with specific
> governos extremely and is not able to decide the new frequency by oneself.
> According to the decided new frequency of parent driver with governor,
> the passive governor uses it to decide the appropriate frequency for own
> device driver. The passive governor must need the following information
> from device tree:
> - the source clock and OPP tables
> - the instance of parent device
>
> For exameple,
> there are one more devfreq device drivers which need to change their source
> clock according to their utilization on runtime. But, they share the same
> power line (e.g., regulator). So, specific device driver is operated as parent
> with ondemand governor and then the rest device driver with passive governor
> is influenced by parent device.
>
> Suggested-by: Myungjoo Ham <myungjoo.ham@samsung.com>
> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
> [tjakobi: Reported RCU locking issue and cw00.choi fix it]
> Reported-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
> [linux.amoon: Reported possible recursive locking and cw00.choi fix it]
> Reported-by: Anand Moon <linux.amoon@gmail.com>
> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
> ---
> drivers/devfreq/Kconfig | 8 ++
> drivers/devfreq/Makefile | 1 +
> drivers/devfreq/governor_passive.c | 207 +++++++++++++++++++++++++++++++++++++
> include/linux/devfreq.h | 33 ++++++
> 4 files changed, 249 insertions(+)
> create mode 100644 drivers/devfreq/governor_passive.c
>
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Best regards,
Krzysztof
next prev parent reply other threads:[~2016-04-12 8:11 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-11 3:57 [PATCH v9 00/20] PM / devferq: Add generic exynos bus frequency driver and new passive governor Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 01/20] PM / devfreq: exynos: Add generic exynos bus frequency driver Chanwoo Choi
2016-04-12 7:23 ` Krzysztof Kozlowski
2016-04-11 3:57 ` [PATCH v9 02/20] PM / devfreq: exynos: Add documentation for " Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 03/20] PM / devfreq: Add devfreq_get_devfreq_by_phandle() Chanwoo Choi
2016-04-12 7:24 ` Krzysztof Kozlowski
2016-04-11 3:57 ` [PATCH v9 04/20] PM / devfreq: Add new DEVFREQ_TRANSITION_NOTIFIER notifier Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 05/20] PM / devfreq: Add new passive governor Chanwoo Choi
2016-04-12 7:30 ` Krzysztof Kozlowski [this message]
2016-04-11 3:57 ` [PATCH v9 06/20] PM / devfreq: exynos: Add support of bus frequency of sub-blocks using " Chanwoo Choi
2016-04-12 7:31 ` Krzysztof Kozlowski
2016-04-11 3:57 ` [PATCH v9 07/20] PM / devfreq: exynos: Update documentation for bus devices " Chanwoo Choi
2016-04-12 7:34 ` Krzysztof Kozlowski
2016-04-12 8:19 ` Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 08/20] PM / devfreq: exynos: Add the detailed correlation between sub-blocks and power line Chanwoo Choi
2016-04-12 7:35 ` Krzysztof Kozlowski
2016-04-12 8:20 ` Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 09/20] PM / devfreq: exynos: Remove unused exynos4/5 busfreq driver Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 10/20] MAINTAINERS: Add samsung bus frequency driver entry Chanwoo Choi
2016-04-12 7:46 ` Krzysztof Kozlowski
2016-04-12 8:20 ` Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 11/20] ARM: dts: Add DMC bus node for Exynos3250 Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 12/20] ARM: dts: Add DMC bus frequency for exynos3250-rinato/monk Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 13/20] ARM: dts: Add bus nodes using VDD_INT for Exynos3250 Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 14/20] ARM: dts: Add bus nodes using VDD_MIF for Exynos4x12 Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 15/20] ARM: dts: Add bus nodes using VDD_INT " Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 16/20] ARM: dts: Add bus nodes using VDD_MIF for Exynos4210 Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 17/20] ARM: dts: Add exynos4412-ppmu-common dtsi to delete duplicate PPMU nodes Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 18/20] ARM: dts: Add support of bus frequency using VDD_INT for exynos3250-rinato Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 19/20] ARM: dts: Expand the voltage range of buck1/3 regulator for exynos4412-odroidu3 Chanwoo Choi
2016-04-11 3:57 ` [PATCH v9 20/20] ARM: dts: Add support of bus frequency for exynos4412-trats/odroidu3 Chanwoo Choi
2016-04-11 4:01 ` [PATCH v9 00/20] PM / devferq: Add generic exynos bus frequency driver and new passive governor Chanwoo Choi
2016-04-11 19:55 ` Krzysztof Kozlowski
2016-04-11 20:15 ` Chanwoo Choi
2016-05-03 10:25 ` Krzysztof Kozlowski
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