From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chanwoo Choi Subject: Re: [PATCH v9 00/20] PM / devferq: Add generic exynos bus frequency driver and new passive governor Date: Mon, 11 Apr 2016 13:01:18 +0900 Message-ID: <570B218E.5000908@samsung.com> References: <1460347078-15175-1-git-send-email-cw00.choi@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-reply-to: <1460347078-15175-1-git-send-email-cw00.choi@samsung.com> Sender: linux-pm-owner@vger.kernel.org To: myungjoo.ham@samsung.com, k.kozlowski@samsung.com, kgene@kernel.org Cc: kyungmin.park@samsung.com, s.nawrocki@samsung.com, tomasz.figa@gmail.com, 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 List-Id: devicetree@vger.kernel.org Dear Myungjoo and Krzysztof, This patch-set already get the acked-by or signed-off-by tag from Exynos SoC and DEVFREQ maintainer except for patch10. If there is no comment, could you pick this patch-set? Best Regards, Chanwoo Choi On 2016=EB=85=84 04=EC=9B=94 11=EC=9D=BC 12:57, Chanwoo Choi wrote: > This patch-set includes the two features as following. The generic ex= ynos bus > frequency driver is able to support almost Exynos SoCs for bus freque= ncy > scaling. And the new passive governor is able to make the dependency = on > between devices for frequency/voltage scaling. I had posted the patch= -set[1] > with the similiar concept. This is is revised version for exynos bus = frequency. > - Generic exynos bus frequency driver > - New passive governor of DEVFREQ framework > [1] https://lkml.org/lkml/2015/1/7/872 > : [PATCHv3 0/8] devfreq: Add generic exynos memory-bus frequency driv= er >=20 > Changes from v8: > (https://lkml.org/lkml/2016/4/8/14) > - Fix possible recursive locking issue by using mutex_lock_nested() >=20 > Changes from v7: > (https://lkml.org/lkml/2016/3/31/308) > - Use IS_ERR() instead of IS_ERR_OR_NULL() macro > - Add signed-off-by/acked-by tag of DEVFREQ maintainer > - Fix the comment in governor_passive.c >=20 > Changes from v6: > (https://lkml.org/lkml/2016/3/27/187) > - Patch1/2 add signed-off-by tag from DEVFREQ Maintainer (Myungjoo Ha= m) > - Drop patch5 (PM / devfreq: Add governer type with unique number) > - Add missing description about the transition_notifier_list in struc= t devfreq > - Remove the passive governor code from devfreq.c core driver. Instea= d, passive > governor uses the DEVFREQ_GOV_START/STOP signal to register/unregis= ter the > DEVFREQ_TRANSITION_NOTIFIER between the parent devfreq device and p= assive > devfreq device. > - Add the author (myungjoo.ham@samsung.com) of passive governor=20 > - Add 'struct devfreq_passive_data' to pass the devfreq instance of p= arent. >=20 > Changes from v5: > (https://lkml.org/lkml/2016/3/24/5) > - Rebase the patch-set on Linux v4.6-rc1 > - Add Tested-by tag from Markus Reichl > - Add Tested-by tag from Anand Moon >=20 > Changes from v4: > (https://lkml.org/lkml/2015/12/14/43) > - Add new DEVFREQ_TRANSITION_NOTIFIER notifier. The passive > devfreq device recevie the changed frequency of parent > devfreq device through DEVFREQ_TRANSITION_NOTIFIER. > - Add governor type to identify thme using the defined constant > - Modify the passive governor using the DEVFREQ_TRANSITION_NOTIFIER n= otifier. > - Fix the RCU locking probrlm (Reported-by: Tobias Jakobi) > - Fix the debugfs error during the kernel booting (Reported-by: Tobia= s Jakobi) > - The Device Tree patches have got Reviewed-by tag from Exynos SoC Ma= intainer > (Krzysztof Kozlowski ) >=20 > Changes from v3: > (https://lkml.org/lkml/2015/12/11/75) > - Add the reviewed-by tag from Krzysztof Kozlowski (patch2/3/13/14/15= /16/17) > - Fix typo of the description on patch14 > - Modify the subject and description of patch17 > - Reorder the 'bus_xxx' device tree node alphabetically in=20 > both exynos3250-rinato/monk.dts and exynos4412-trats/odroidu3 >=20 > Changes from v2: > (https://lkml.org/lkml/2015/12/8/869) > - Fix typo on documentation > - Modify the more appropriate sentence on patch description > - Add the detailed description about both parent and passive bus devi= ce > - Modify the DMC frequency for Exynos4x12 DMC bus (200MHz -> 267MHz) > - Modify the voltage of 200MHz was included in Exynos3250 DMC bus (80= 0mV -> 825mV) > - Rename OPP nodes as 'opp@' > - Delete the duplicate 'opp-microvolt' property of passive devfreq de= vice > - Reorder the 'bus_xxx' device tree node alphabetically in exynos3250= -rinato/monk.dts > - Reorder the 'bus_xxx' device tree node alphabetically in exynos4412= -trats/odroidu3 > - Add new exynos4412-ppmu-common.dtsi to remove the duplicate PPMU dt= node > on rinato/monk/trats2/odroid-u3 board > - Add the log message if bus device is registered to devfreq framewor= k successfully > - Add the reviewed-by tag from Krzysztof Kozlowski > - Add the tested-by tag from Anand Moon on Odroid U3 > - Add 'SAMSUNG BUS FREQUENCY DRIVER' entry to MAINTAINERS >=20 > Changes from v1: > (https://lkml.org/lkml/2015/11/26/260) > - Check whether the instance of regulator is NULL or not > when executing regulator_disable() because of only parent > devfreq device has the regulator instance. After fixing it, > the wake-up from suspend state is well working. (patch1) > - Fix bug which checks 'bus-clk' instead of 'bus->regulator' > after calling devm_clk_get() (on patch1) > - Update the documentation to remove the description about > DEVFREQ-EVENT subsystem (on patch2) > - Add the full name of DMC (Dynamic Memory Controller) (on patch2) > - Modify the detailed correlation of buses for Exynos3250 > on documentation (patch2) > - Add the MFC bus node for Exynos3250 (on patch11, patch12) > - Fix the duplicate frequency of bus_display on Exynos4x12.dtsi > - Add the PPMU node for exynos4412-odroidu3 > - Add the support of bus frequency for exynos4412-odroidu3 >=20 >=20 > [Description] > Detailed descirption for patch-set: > 1. Add generic exynos bus frequency driver > : This patch-set adds the generic exynos bus frequency driver for AXI= bus > of sub-blocks in exynos SoC. The Samsung Exynos SoC have the common > architecture for bus between DRAM and sub-blocks in SoC. >=20 > There are the different buses according to Exynos SoC because Exynos= SoC > has the differnt sub-blocks and bus speed. In spite of this differenc= e > among Exynos SoCs, this driver is able to support almost Exynos SoC b= y adding > unique data of each bus in the devicetree file. >=20 > In devicetree, each bus node has a bus clock, regulator, operation-p= oint > and devfreq-event devices which measure the utilization of each bus b= lock. >=20 > For example, > - The bus of DMC block in exynos3250.dtsi are listed below: >=20 > bus_dmc: bus_dmc { > compatible =3D "samsung,exynos-bus"; > clocks =3D <&cmu_dmc CLK_DIV_DMC>; > clock-names =3D "bus"; > operating-points-v2 =3D <&bus_dmc_opp_table>; > status =3D "disabled"; > }; >=20 > bus_dmc_opp_table: opp_table1 { > compatible =3D "operating-points-v2"; > opp-shared; >=20 > opp@50000000 { > opp-hz =3D /bits/ 64 <50000000>; > opp-microvolt =3D <800000>; > }; > opp@100000000 { > opp-hz =3D /bits/ 64 <100000000>; > opp-microvolt =3D <800000>; > }; > opp@134000000 { > opp-hz =3D /bits/ 64 <134000000>; > opp-microvolt =3D <800000>; > }; > opp@200000000 { > opp-hz =3D /bits/ 64 <200000000>; > opp-microvolt =3D <825000>; > }; > opp@400000000 { > opp-hz =3D /bits/ 64 <400000000>; > opp-microvolt =3D <875000>; > }; > }; >=20 > - Usage case to handle the frequency and voltage of bus on runtime > in exynos3250-rinato.dts are listed below: >=20 > &bus_dmc { > devfreq-events =3D <&ppmu_dmc0_3>, <&ppmu_dmc1_3>; > vdd-supply =3D <&buck1_reg>; /* VDD_MIF */ > status =3D "okay"; > }; >=20 > 2. Add new passive governor of DEVFREQ framework > : This patch-set add the new passive governor for DEVFREQ framework. > The existing governors (ondemand, performance and so on) are used for= DVFS > (Dynamic Voltage and Frequency Scaling) drivers. The existing governo= rs > are independently used for specific device driver which don't give th= e > influence to other device drviers and also don't receive the effect f= rom > other device drivers. >=20 > The passive governor depends on operation of parent driver with exis= ting > governors(ondemand, performance and so on) extremely and is not able = to > decide the new frequency by oneself. According to the decided new fre= quency > of parent driver with governor, the passive governor uses it to decid= e > the appropriate frequency for own device driver. The passive governor > must need the following information from device tree: >=20 > For exameple, > There are one more bus device drivers in Exynos3250 which need to > change their source clock according to their utilization on runtime. > But, they share the same power line (e.g., regulator). So, LEFTBUS bu= s > driver is operated as parent with ondemand governor and then the rest > device driver with passive governor. >=20 > The buses of Internal block in exynos3250.dtsi are listed below: > When LEFTBUS bus driver (parent) changes the bus frequency with > ondemand governor on runtime, the rest bus devices which sharing > the same power line (VDD_INT) will change the each bus frequency > according to the decision of LEFTBUS bus driver (parent). >=20 > - INT (Internal) block > : VDD_INT |--- LEFTBUS > |--- PERIL > |--- MFC > |--- G3D > |--- RIGHTBUS > |--- FSYS > |--- LCD0 > |--- PERIR > |--- ISP > |--- CAM >=20 > - The buss of INT block in exynos3250.dtsi are listed below: > bus_leftbus: bus_leftbus { > compatible =3D "samsung,exynos-bus"; > clocks =3D <&cmu CLK_DIV_GDL>; > clock-names =3D "bus"; > operating-points-v2 =3D <&bus_leftbus_opp_table>; > status =3D "disabled"; > }; >=20 > bus_rightbus: bus_rightbus { > compatible =3D "samsung,exynos-bus"; > clocks =3D <&cmu CLK_DIV_GDR>; > clock-names =3D "bus"; > operating-points-v2 =3D <&bus_leftbus_opp_table>; > status =3D "disabled"; > }; >=20 > (Omit the rest bus dt node) >=20 > - Usage case to handle the frequency and voltage of bus on runtime > in exynos3250-rinato.dts are listed below: > /* Parent bus device of VDD_INT */ > &bus_leftbus { > devfreq-events =3D <&ppmu_leftbus_3>, <&ppmu_rightbus_3>; > vdd-supply =3D <&buck3_reg>; > status =3D "okay"; > }; >=20 > /* Passive bus device depend on LEFTBUS bus. */ > &bus_rightbus { > devfreq =3D <&bus_leftbus>; /* 'devfreq' property indicates > the phandle of parent device. */ > status =3D "okay"; > }; >=20 > (Omit the rest bus dt node) >=20 >=20 > Chanwoo Choi (20): > PM / devfreq: exynos: Add generic exynos bus frequency driver > PM / devfreq: exynos: Add documentation for generic exynos bus freq= uency driver > PM / devfreq: Add devfreq_get_devfreq_by_phandle() > PM / devfreq: Add new DEVFREQ_TRANSITION_NOTIFIER notifier > PM / devfreq: Add new passive governor > PM / devfreq: exynos: Add support of bus frequency of sub-blocks us= ing passive governor > PM / devfreq: exynos: Update documentation for bus devices using pa= ssive governor > PM / devfreq: exynos: Add the detailed correlation between sub-bloc= ks and power line > PM / devfreq: exynos: Remove unused exynos4/5 busfreq driver > MAINTAINERS: Add samsung bus frequency driver entry > ARM: dts: Add DMC bus node for Exynos3250 > ARM: dts: Add DMC bus frequency for exynos3250-rinato/monk > ARM: dts: Add bus nodes using VDD_INT for Exynos3250 > ARM: dts: Add bus nodes using VDD_MIF for Exynos4x12 > ARM: dts: Add bus nodes using VDD_INT for Exynos4x12 > ARM: dts: Add bus nodes using VDD_MIF for Exynos4210 > ARM: dts: Add exynos4412-ppmu-common dtsi to delete duplicate PPMU = nodes > ARM: dts: Add support of bus frequency using VDD_INT for exynos3250= -rinato > ARM: dts: Expand the voltage range of buck1/3 regulator for exynos4= 412-odroidu3 > ARM: dts: Add support of bus frequency for exynos4412-trats/odroidu= 3 > .../devicetree/bindings/devfreq/exynos-bus.txt | 390 ++++++++ > MAINTAINERS | 9 + > arch/arm/boot/dts/exynos3250-monk.dts | 47 +- > arch/arm/boot/dts/exynos3250-rinato.dts | 88 +- > arch/arm/boot/dts/exynos3250.dtsi | 181 ++++ > arch/arm/boot/dts/exynos4210.dtsi | 159 +++ > arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 56 +- > arch/arm/boot/dts/exynos4412-ppmu-common.dtsi | 50 + > arch/arm/boot/dts/exynos4412-trats2.dts | 88 +- > arch/arm/boot/dts/exynos4x12.dtsi | 174 ++++ > drivers/devfreq/Kconfig | 36 +- > drivers/devfreq/Makefile | 4 +- > drivers/devfreq/devfreq.c | 207 +++- > drivers/devfreq/exynos-bus.c | 570 ++++++++++= + > drivers/devfreq/exynos/Makefile | 3 - > drivers/devfreq/exynos/exynos4_bus.c | 1055 ----------= ---------- > drivers/devfreq/exynos/exynos4_bus.h | 110 -- > drivers/devfreq/exynos/exynos5_bus.c | 431 -------- > drivers/devfreq/exynos/exynos_ppmu.c | 119 --- > drivers/devfreq/exynos/exynos_ppmu.h | 86 -- > drivers/devfreq/governor_passive.c | 207 ++++ > include/linux/devfreq.h | 99 ++ > 22 files changed, 2221 insertions(+), 1948 deletions(-) > create mode 100644 Documentation/devicetree/bindings/devfreq/exynos-= bus.txt > create mode 100644 arch/arm/boot/dts/exynos4412-ppmu-common.dtsi > create mode 100644 drivers/devfreq/exynos-bus.c > delete mode 100644 drivers/devfreq/exynos/Makefile > delete mode 100644 drivers/devfreq/exynos/exynos4_bus.c > delete mode 100644 drivers/devfreq/exynos/exynos4_bus.h > delete mode 100644 drivers/devfreq/exynos/exynos5_bus.c > delete mode 100644 drivers/devfreq/exynos/exynos_ppmu.c > delete mode 100644 drivers/devfreq/exynos/exynos_ppmu.h > create mode 100644 drivers/devfreq/governor_passive.c >=20