Hi Chanwoo, Chanwoo Choi <[email protected]> writes:
> This patchset introduce the generic devfreq cooling device for generic thermal > framework. The devfreq devices are used ad cooling device to reduce the > overheating temperature. This patch is based on drivers/thermal/cpu_cooling.c. > The devfreq cooling device can change the ragne of the frequency table of > devfreq device according to cooling level in device tree file. > Have you had a look at the devfreq cooling patches from Javi[0][1]? How is the current patchset different? At first glance, it seems that you are not implementing the extensions that allow devfreq cooling devices to be used with power_allocator thermal governor that got merged in v4.2-rc1. Thanks, Punit [0] http://article.gmane.org/gmane.linux.power-management.general/61936 [1] http://article.gmane.org/gmane.linux.power-management.general/62417 > To verify the devfreq cooling device driver, I testd it with following > platform: > > For example, > - The Mali GPU of Exynos5433 SoC uses the devfreq framework to support the > DVFS > feature and Exynos5433 contains the G3D (GPU) thermal sensor. Following > example > explain the correlation between mali dt node and thermal sensor/zone. > : thermal sensor : G3D sensor of Samsung Exynos5433 [1][2] > : devfreq cooling device : Mali GPU [3] > > According to the temperature of g3d thermal sensor inclued in Exynos5433, > devfreq cooling device can change the maximum frequency of Mali GPU. > > 1. In Exynos5433-based board dts file, Mali GPU dt node uses the devfreq > framework to suppot the DVFS feature. Following dt node includes the > both 'cooling-cells' and 'operating-points' which means the supported > frequency entries: > > mali: mali@14AC0000 { > compatible = "arm,mali-midgard"; > reg = <0x14AC0000 0x5000>; > interrupts = <0 282 0>, <0 283 0>, <0 281 0>; > interrupt-names = "JOB", "MMU", "GPU"; > clocks = <&cmu_g3d CLK_ACLK_G3D>; > clock-names = "clk_mali"; > power-domains = <&pd_g3d>; > status = "disabled"; > > #cooling-cells = <2>; > > operating-points = < > 700000 1150000 > 600000 1150000 > 550000 1125000 > 500000 1075000 > 420000 1025000 > 350000 1025000 > 266000 1000000 > 160000 1000000 > >; > }; > > 2. In exynos5433.dtsi, G3D thermal sensor measure the temperature of Mali GPU: > > tmu_g3d: tmu@10070000 { > compatible = "samsung,exynos5433-tmu"; > reg = <0x10070000 0x200>; > interrupts = <0 99 0>; > clocks = <&cmu_peris CLK_PCLK_TMU1_APBIF>, > <&cmu_peris CLK_SCLK_TMU1>; > clock-names = "tmu_apbif", "tmu_sclk"; > #include "exynos5433-tmu-sensor-conf.dtsi" > status = "disabled"; > }; > > 3. In exynos5433-tmu.dtsi, thermal-zones includes both trip points and > cooling-maps of g3d thermal sensor. Following cooling-maps show the match > between each trip point and each cooling device (devfreq device of mali): > > thermal-zones { > /* ...... */ > g3d_thermal: g3d-thermal { > thermal-sensors = <&tmu_g3d>; > polling-delay-passive = <0>; > polling-delay = <0>; > trips { > g3d_alert_0: g3d-alert-0 { > temperature = <30000>; /* millicelsius > */ > hysteresis = <10000>; /* millicelsius > */ > type = "active"; > }; > g3d_alert_1: g3d-alert-1 { > temperature = <40000>; /* millicelsius > */ > hysteresis = <10000>; /* millicelsius > */ > type = "active"; > }; > > /* ...... */ > }; > > cooling-maps { > map0 { > /* Set maximum frequency as 550MHz */ > trip = <&g3d_alert_0>; > cooling-device = <&mali 2 2>; > }; > map1 { > /* Set maximum frequency as 420MHz */ > trip = <&g3d_alert_1>; > cooling-device = <&mali 4 4>; > }; > > /* ...... */ > }; > }; > > ...... > }; > > [1] > https://git.kernel.org/cgit/linux/kernel/git/kgene/linux-samsung.git/commit/?h=v4.3-next/dt64-samsung&id=ac008f6b537703bb9a6fcc3882ca4af3331aa24f > [2] > https://git.kernel.org/cgit/linux/kernel/git/kgene/linux-samsung.git/commit/?h=v4.3-next/dt64-samsung&id=bcddc3a84e49ca1c646cf2081687a544a15f9218 > [3] > malideveloper.arm.com/downloads/drivers/TX041/r5p0-06rel0/TX041-SW-99002-r5p0-06rel0.tgz > > Chanwoo Choi (2): > PM: devfreq: Add the prototype of update_devfreq() to export > thermal: devfreq_cooling: Add generic devfreq cooling device implementaion > > .../devicetree/bindings/thermal/thermal.txt | 8 +- > drivers/devfreq/devfreq.c | 22 +- > drivers/thermal/Kconfig | 11 + > drivers/thermal/Makefile | 3 + > drivers/thermal/devfreq-cooling.c | 309 > +++++++++++++++++++++ > include/linux/devfreq-cooling.h | 80 ++++++ > include/linux/devfreq.h | 7 + > 7 files changed, 425 insertions(+), 15 deletions(-) > create mode 100644 drivers/thermal/devfreq-cooling.c > create mode 100644 include/linux/devfreq-cooling.h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
