The Smart Voltage Scaling(SVS) engine is a piece of hardware which calculates suitable SVS bank voltages to OPP voltage table. Then, DVFS driver could apply those SVS bank voltages to PMIC/Buck when receiving OPP_EVENT_ADJUST_VOLTAGE. 1. SVS driver uses OPP adjust event in [1] to update OPP table voltage part. 2. SVS driver gets thermal/GPU device by node [2][3] and CPU device by get_cpu_device(). After retrieving subsys device, SVS driver calls device_link_add() to make sure probe/suspend callback priority. [1] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git/commit/?h=opp/linux-next&id=25cb20a212a1f989385dfe23230817e69c62bee5 [2] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git/commit/?h=opp/linux-next&id=b325ce39785b1408040d90365a6ab1aa36e94f87 [3] https://git.kernel.org/pub/scm/linux/kernel/git/matthias.bgg/linux.git/commit/?h=v5.16-next/dts64&id=a8168cebf1bca1b5269e8a7eb2626fb76814d6e2 Change since v24: - Rebase to Linux 5.18-rc6 - Show specific fail log in svs_platform_probe() to help catch which step fails quickly - Remove struct svs_bank member "pd_dev" because all subsys device's power domain has been merged into one node like above [3] Test in below environment: SW: Integration Tree [4] + Thermal patch [5] + SVS v25 (this patchset) HW: mt8183-Krane [4] https://github.com/wens/linux/commits/mt8183-cpufreq-cci-svs-test [5] https://patchwork.kernel.org/project/linux-pm/patch/20210820095206.30981-1-ben.tseng@xxxxxxxxxxxx Boots up log: [ 4.447369] SVSB_CPU_LITTLE: svs_init01_isr_handler: VDN74~30:0x141e262e~0x33373c42, DC:0x02f3010b [ 4.447623] SVSB_CPU_BIG: svs_init01_isr_handler: VDN74~30:0x151f2830~0x363a4046, DC:0x02f90141 [ 4.447872] SVSB_CCI: svs_init01_isr_handler: VDN74~30:0x141a232b~0x30363d42, DC:0x02ed00d5 [ 4.448119] SVSB_GPU: svs_init01_isr_handler: VDN74~30:0x1416171a~0x1d202327, DC:0x02f7012f [ 4.448239] SVSB_CPU_LITTLE: svs_init02_isr_handler: VOP74~30:0x1b252d35~0x3a3e4349, DC:0x02f30000 [ 4.448343] SVSB_CPU_BIG: svs_init02_isr_handler: VOP74~30:0x1c262f37~0x3d41474d, DC:0x02f90000 [ 4.448400] SVSB_CCI: svs_init02_isr_handler: VOP74~30:0x1b212a32~0x373d4449, DC:0x02ed0000 [ 4.448499] SVSB_GPU: svs_init02_isr_handler: VOP74~30:0x1618191c~0x1f222529, DC:0x02f70000 SVS commands log: localhost ~ # cat /sys/kernel/debug/svs/*/* init2 SVSB_CCI: temperature ignore, turn_pt = 0 opp_freq[00]: 1196000000, opp_volt[00]: 968750, svsb_volt[00]: 0x4b, freq_pct[00]: 100 opp_freq[01]: 1144000000, opp_volt[01]: 956250, svsb_volt[01]: 0x49, freq_pct[01]: 96 opp_freq[02]: 1092000000, opp_volt[02]: 937500, svsb_volt[02]: 0x46, freq_pct[02]: 92 opp_freq[03]: 1027000000, opp_volt[03]: 918750, svsb_volt[03]: 0x43, freq_pct[03]: 86 opp_freq[04]: 962000000, opp_volt[04]: 893750, svsb_volt[04]: 0x3f, freq_pct[04]: 81 opp_freq[05]: 923000000, opp_volt[05]: 881250, svsb_volt[05]: 0x3d, freq_pct[05]: 78 opp_freq[06]: 871000000, opp_volt[06]: 856250, svsb_volt[06]: 0x39, freq_pct[06]: 73 opp_freq[07]: 845000000, opp_volt[07]: 850000, svsb_volt[07]: 0x38, freq_pct[07]: 71 opp_freq[08]: 767000000, opp_volt[08]: 825000, svsb_volt[08]: 0x34, freq_pct[08]: 65 opp_freq[09]: 689000000, opp_volt[09]: 800000, svsb_volt[09]: 0x30, freq_pct[09]: 58 opp_freq[10]: 624000000, opp_volt[10]: 775000, svsb_volt[10]: 0x2c, freq_pct[10]: 53 opp_freq[11]: 546000000, opp_volt[11]: 750000, svsb_volt[11]: 0x28, freq_pct[11]: 46 opp_freq[12]: 463000000, opp_volt[12]: 718750, svsb_volt[12]: 0x23, freq_pct[12]: 39 opp_freq[13]: 403000000, opp_volt[13]: 700000, svsb_volt[13]: 0x20, freq_pct[13]: 34 opp_freq[14]: 338000000, opp_volt[14]: 681250, svsb_volt[14]: 0x1d, freq_pct[14]: 29 opp_freq[15]: 273000000, opp_volt[15]: 650000, svsb_volt[15]: 0x1a, freq_pct[15]: 23 init2 SVSB_CPU_BIG: temperature ignore, turn_pt = 0 opp_freq[00]: 1989000000, opp_volt[00]: 1050000, svsb_volt[00]: 0x59, freq_pct[00]: 100 opp_freq[01]: 1924000000, opp_volt[01]: 1025000, svsb_volt[01]: 0x57, freq_pct[01]: 97 opp_freq[02]: 1846000000, opp_volt[02]: 1000000, svsb_volt[02]: 0x53, freq_pct[02]: 93 opp_freq[03]: 1781000000, opp_volt[03]: 975000, svsb_volt[03]: 0x50, freq_pct[03]: 90 opp_freq[04]: 1716000000, opp_volt[04]: 950000, svsb_volt[04]: 0x4d, freq_pct[04]: 87 opp_freq[05]: 1677000000, opp_volt[05]: 931250, svsb_volt[05]: 0x4c, freq_pct[05]: 85 opp_freq[06]: 1625000000, opp_volt[06]: 912500, svsb_volt[06]: 0x49, freq_pct[06]: 82 opp_freq[07]: 1586000000, opp_volt[07]: 900000, svsb_volt[07]: 0x47, freq_pct[07]: 80 opp_freq[08]: 1508000000, opp_volt[08]: 875000, svsb_volt[08]: 0x43, freq_pct[08]: 76 opp_freq[09]: 1417000000, opp_volt[09]: 850000, svsb_volt[09]: 0x40, freq_pct[09]: 72 opp_freq[10]: 1326000000, opp_volt[10]: 825000, svsb_volt[10]: 0x3b, freq_pct[10]: 67 opp_freq[11]: 1248000000, opp_volt[11]: 800000, svsb_volt[11]: 0x38, freq_pct[11]: 63 opp_freq[12]: 1131000000, opp_volt[12]: 775000, svsb_volt[12]: 0x32, freq_pct[12]: 57 opp_freq[13]: 1014000000, opp_volt[13]: 750000, svsb_volt[13]: 0x2d, freq_pct[13]: 51 opp_freq[14]: 910000000, opp_volt[14]: 725000, svsb_volt[14]: 0x28, freq_pct[14]: 46 opp_freq[15]: 793000000, opp_volt[15]: 700000, svsb_volt[15]: 0x23, freq_pct[15]: 40 init2 SVSB_CPU_LITTLE: temperature ignore, turn_pt = 0 opp_freq[00]: 1989000000, opp_volt[00]: 968750, svsb_volt[00]: 0x4b, freq_pct[00]: 100 opp_freq[01]: 1924000000, opp_volt[01]: 956250, svsb_volt[01]: 0x49, freq_pct[01]: 97 opp_freq[02]: 1846000000, opp_volt[02]: 931250, svsb_volt[02]: 0x45, freq_pct[02]: 93 opp_freq[03]: 1781000000, opp_volt[03]: 918750, svsb_volt[03]: 0x43, freq_pct[03]: 90 opp_freq[04]: 1716000000, opp_volt[04]: 900000, svsb_volt[04]: 0x40, freq_pct[04]: 87 opp_freq[05]: 1677000000, opp_volt[05]: 893750, svsb_volt[05]: 0x3f, freq_pct[05]: 85 opp_freq[06]: 1625000000, opp_volt[06]: 875000, svsb_volt[06]: 0x3c, freq_pct[06]: 82 opp_freq[07]: 1586000000, opp_volt[07]: 868750, svsb_volt[07]: 0x3b, freq_pct[07]: 80 opp_freq[08]: 1508000000, opp_volt[08]: 843750, svsb_volt[08]: 0x37, freq_pct[08]: 76 opp_freq[09]: 1417000000, opp_volt[09]: 825000, svsb_volt[09]: 0x34, freq_pct[09]: 72 opp_freq[10]: 1326000000, opp_volt[10]: 793750, svsb_volt[10]: 0x2f, freq_pct[10]: 67 opp_freq[11]: 1248000000, opp_volt[11]: 775000, svsb_volt[11]: 0x2c, freq_pct[11]: 63 opp_freq[12]: 1131000000, opp_volt[12]: 743750, svsb_volt[12]: 0x27, freq_pct[12]: 57 opp_freq[13]: 1014000000, opp_volt[13]: 712500, svsb_volt[13]: 0x22, freq_pct[13]: 51 opp_freq[14]: 910000000, opp_volt[14]: 681250, svsb_volt[14]: 0x1d, freq_pct[14]: 46 opp_freq[15]: 793000000, opp_volt[15]: 650000, svsb_volt[15]: 0x18, freq_pct[15]: 40 mon mode SVSB_GPU: temperature = 33492, turn_pt = 0 opp_freq[00]: 800000000, opp_volt[00]: 743750, svsb_volt[00]: 0x27, freq_pct[00]: 100 opp_freq[01]: 743000000, opp_volt[01]: 731250, svsb_volt[01]: 0x25, freq_pct[01]: 93 opp_freq[02]: 698000000, opp_volt[02]: 718750, svsb_volt[02]: 0x23, freq_pct[02]: 88 opp_freq[03]: 653000000, opp_volt[03]: 712500, svsb_volt[03]: 0x22, freq_pct[03]: 82 opp_freq[04]: 620000000, opp_volt[04]: 700000, svsb_volt[04]: 0x20, freq_pct[04]: 78 opp_freq[05]: 580000000, opp_volt[05]: 693750, svsb_volt[05]: 0x1f, freq_pct[05]: 73 opp_freq[06]: 540000000, opp_volt[06]: 681250, svsb_volt[06]: 0x1d, freq_pct[06]: 68 opp_freq[07]: 500000000, opp_volt[07]: 675000, svsb_volt[07]: 0x1c, freq_pct[07]: 63 opp_freq[08]: 460000000, opp_volt[08]: 662500, svsb_volt[08]: 0x1a, freq_pct[08]: 58 opp_freq[09]: 420000000, opp_volt[09]: 656250, svsb_volt[09]: 0x19, freq_pct[09]: 53 opp_freq[10]: 400000000, opp_volt[10]: 643750, svsb_volt[10]: 0x17, freq_pct[10]: 50 opp_freq[11]: 380000000, opp_volt[11]: 643750, svsb_volt[11]: 0x17, freq_pct[11]: 48 opp_freq[12]: 360000000, opp_volt[12]: 637500, svsb_volt[12]: 0x16, freq_pct[12]: 45 opp_freq[13]: 340000000, opp_volt[13]: 637500, svsb_volt[13]: 0x16, freq_pct[13]: 43 opp_freq[14]: 320000000, opp_volt[14]: 625000, svsb_volt[14]: 0x14, freq_pct[14]: 40 opp_freq[15]: 300000000, opp_volt[15]: 625000, svsb_volt[15]: 0x14, freq_pct[15]: 38 Roger Lu (7): [v25,1/7] dt-bindings: soc: mediatek: add mtk svs dt-bindings [v25,2/7] arm64: dts: mt8183: add svs device information [v25,3/7] soc: mediatek: SVS: introduce MTK SVS engine [v25,4/7] soc: mediatek: SVS: add monitor mode [v25,5/7] soc: mediatek: SVS: add debug commands [v25,6/7] dt-bindings: soc: mediatek: add mt8192 svs dt-bindings [v25,7/7] soc: mediatek: SVS: add mt8192 SVS GPU driver .../bindings/soc/mediatek/mtk-svs.yaml | 91 + arch/arm64/boot/dts/mediatek/mt8183.dtsi | 16 + drivers/soc/mediatek/Kconfig | 10 + drivers/soc/mediatek/Makefile | 1 + drivers/soc/mediatek/mtk-svs.c | 2399 +++++++++++++++++ 5 files changed, 2517 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/mediatek/mtk-svs.yaml create mode 100644 drivers/soc/mediatek/mtk-svs.c
