On Sun, 2021-01-31 at 11:34 +0100, Matthias Brugger wrote: > > On 29/12/2020 07:17, Hector Yuan wrote: > > The CPUfreq HW present in some Mediatek chipsets offloads the steps > > necessary for changing the frequency of CPUs. > > The driver implements the cpufreq driver interface for this hardware > > engine. > > This patch depends on MT6779 DTS patchset[1] submitted by Hanks Chen. > > This dependency got resolved, the patch is mainline since v5.11. Please delete > it in further revisions of the patch set to minimize confusion. > > Thanks! > Thanks, I will remove this dependency in the next version. > > > > From v8 to v9, there are three more modifications. > > 1. Based on patchset[2], align binding with scmi for performance domain. > > 2. Add the CPUFREQ fast switch function support and define DVFS latency. > > 3. Based on patchser[3], add energy model API parameter for mW. > > > > From v7 to v8, there are three more patches based on patchset v8[4]. > > This patchset is about to register power table to Energy model for EAS and > > thermal usage. > > 1. EM CPU power table > > - Register energy model table for EAS and thermal cooling device usage. > > - Read the coresponding LUT for power table. > > 2. SVS initialization > > - The SVS(Smart Voltage Scaling) engine is a hardware which is > > used to calculate optimized voltage values for CPU power domain. > > DVFS driver could apply those optimized voltage values to reduce power > > consumption. > > - Driver will polling if HW engine is done for SVS initialization. > > After that, driver will read power table and register it to EAS. > > - CPUs must be in power on state when doing SVS. Use pm_qos to block > > cpu-idle state for SVS initializing. > > 3. Cooling device flag > > - Add cooling device flag for thermal > > > > [1] https://lkml.org/lkml/2020/8/4/1094 > > [2] > > https://lore.kernel.org/lkml/20201116181356.804590-1-sudeep.ho...@arm.com/ > > [3] > > https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commit/?h=linux-next&id=c250d50fe2ce627ca9805d9c8ac11cbbf922a4a6 > > [4] https://lkml.org/lkml/2020/9/23/384 > > > > > > Hector.Yuan (2): > > cpufreq: mediatek-hw: Add support for CPUFREQ HW > > dt-bindings: cpufreq: add bindings for MediaTek cpufreq HW > > > > .../bindings/cpufreq/cpufreq-mediatek-hw.yaml | 116 ++++++ > > drivers/cpufreq/Kconfig.arm | 12 + > > drivers/cpufreq/Makefile | 1 + > > drivers/cpufreq/mediatek-cpufreq-hw.c | 370 > > ++++++++++++++++++++ > > 4 files changed, 499 insertions(+) > > create mode 100644 > > Documentation/devicetree/bindings/cpufreq/cpufreq-mediatek-hw.yaml > > create mode 100644 drivers/cpufreq/mediatek-cpufreq-hw.c > >
