On Mon, Jan 12, 2015 at 12:34:00PM +0800, Chen-Yu Tsai wrote: > Hi, > > This is v3 of the cpufreq support series for sunxi. The series has been > rebased onto the latest sunxi-next. I've dropped all the patches Maxime > merged. This includes "ARM: sunxi: Register cpufreq-dt for sun[45678]i" > which was merged but not published yet. > > Individual changes since v2 are listed within each patch. > > > Original cover letter follows: > > This series adds support cpufreq support for sun[457]i using cpufreq-dt. > This also supports passive cpu cooling (thermal throttling) using thermal > zones with the temperature sensor in the SoC. > > The operating points for the supported platforms were taken from the > linux-sunxi FEX files repository. The majority of boards use the same > settings. Only with sun7i do we see slight variations, either disabling > some frequencies, or bumping up the voltage a bit. In either case this > can be done by limiting the constraints for the supply regulator, or > overriding the OPP table in the board dts file. > > On sun7i, there is an additional operating point not found in the FEX > files, 960 MHz @ 1.4V, which is the full speed setting in both u-boot-sunxi > and mainline u-boot. > > The series has been tested on the 4 boards I have. With cpufreq active, > the effects are visible as a decrease in SoC internal temperature. > Stability for the operating points has been tested using: > > http://linux-sunxi.org/Hardware_Reliability_Tests#Reliability_of_cpufreq_voltage.2Ffrequency_settings > > More real world usage feedback is appreciated. Thermal throttling hasn't > been tested much, due to not being able to generate enough load without > the GPU for the SoC to heat up. Also on sun4i, the temperature sensor > still hasn't been calibrated, so the readings are highly inaccurate. Applied 2, 3, 6 and 8. There's still some discussions about the boards regulators, that apply to all of them, even though I commented on one in particular. Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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