MSM平台RPM
发布日期:2021-06-30 21:52:22 浏览次数:2 分类:技术文章

本文共 21980 字,大约阅读时间需要 73 分钟。

Software Component Block Diagram

RPM(Resource Power Manager)是高通MSM平台另外加的一块芯片,虽然与AP芯片打包在一起,但其是一个独立的ARM Core。之所以加这个东西,就是要控制整个电源相关的shared resources,比如ldo,clock。负责与SMP,MPM交互进入睡眠或者唤醒整个系统。 
以下是高通文档中对各个功能模块的说明。 
这里写图片描述

  • Kernel – DALSys-based lightweight kernel
  • RPM handler – RPM handler abstracts the RPM message protocol away 
    from other software
  • Drivers – Drivers for each of the resources supported by the RPM will 
    register with RPM handler to request notification when requests are 
    received for the resource which the driver controls
  • NPA – A driver may use the Node Power Architecture (NPA) to represent 
    resources controlled by the driver
  • Clock driver – RPM clock driver directly handles aggregating requests 
    from each of the masters for any of the systemwide clock resources 
    controlled by the RPM
  • Bus arbitration driver – RPM bus arbiter driver takes bus arbiter settings 
    as requests from the different masters in the system and aggregates them 
    to represent the frequency-independent system settings
  • PMIC – RPM PMIC driver directly aggregates requests from each of the 
    masters for any of the systemwide PMIC resources controlled by the RPM
  • Watch Dog driver – Watch Dog driver is a fail-safe for incorrect or stuck 
    code
  • MPM driver – Used to program the MPM hardware block during 
    systemwide sleep
  • RPM message driver – RPM message protocol driver abstracts the RPM 
    message protocol away from other subsystem software

Messaging Masters

与RPM通过shared memory region交互进行dynamic and static resource/power management的可以有很多种。 
这个可以查看smd_type.h中的smd_channel_type。但目前看只有AP,MODEM,RIVA,TZ与RPM有交互,这个可以看message_ram_malloc()函数中的设置。 
其实也可以间接从rpm_config.c文件中的SystempData temp_config_data这个变量中看出来到底有几个部分是与RPM进行交互的。

RPM Initialization

在main.c文件中会逐个调用init_fcns[]变量中的函数进行初始化。当然也包括上面的资源的初始化。

const init_fcn init_fcns[] ={  populate_image_header,  npa_init,#if (!defined(MSM8909_STUBS) )  railway_init_v2,#endif  PlatformInfo_Init, /* pm_init is using PlatformInfo APIs */  pm_init,//LDO等资源的注册  acc_init,#if (!defined(MSM8909_STUBS) )  railway_init_early_proxy_votes, #endif  // xpu_init, /* cookie set here also indicates to SBL that railway is ready */  (init_fcn)Clock_Init, //Clock资源的注册  __init_stack_chk_guard,  ddr_init,  smem_init,  init_smdl,  version_init,     /* Needs to be after smem_init */  rpmserver_init,  rpm_server_init_done,  railway_init_proxies_and_pins,#if (!defined(MSM8909_STUBS) )  rbcpr_init,#endif    svs_init,  vmpm_init,  sleep_init,#if (!defined(MSM8909_STUBS) )  QDSSInit, #endif  exceptions_enable,  swevent_qdss_init,  icb_init,#if (!defined(MSM8909_STUBS) )  debug_init,  system_db_init,  zqcal_task_init,#endif  rpm_settling_timer_init,  gpio_toggle_init,  rpm_set_changer_common_init,} 
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  1. pm_init : LDO等资源的注册,然后接收rpm_message。接收rpm_message的部分高通代码没有给,所以看不到,但从rpm log来看,是有接收处理并反馈的过程的。
107.764902: rpm_message_received (master: "APSS") (message id: 723)107.764908: rpm_svs (mode: RPM_SVS_FAST) (reason: imminent processing)107.764924: rpm_svs (mode: RPM_SVS_FAST) (reason: imminent processing)107.764939: rpm_process_request (master: "APSS") (resource type: ldoa) (id: 14)107.764942: rpm_xlate_request (resource type: ldoa) (resource id: 14)107.764946: rpm_apply_request (resource type: ldoa) (resource id: 14)107.765033: rpm_send_message_response (master: "APSS") 
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ldoa对应的resource type为RPM_LDO_A_REQ。这个在pm_rom_device_init()里的pm_rpm_ldo_register_resources(RPM_LDO_A_REQ, num_of_ldoa); 这里被注册,所以看进去最后xlate和apply最终都会被pm_rpm_ldo_translation()和pm_rpm_ldo_apply进行处理。pm_rpm_ldo_tranlation()读取kvp内容,pm_rpm_ldo_apply最终把request的内容设置上去。kernel端在msm-pm8916-rpm-regulator.dtsi文件中定如下ldo内容

2. (init_fcn)Clock_Init:Clock资源的注册,这个过程和上面的也差不多 
3. rpmserver_init:启动接收message的进程

比如要设置LDO3的电压和电流,kvp的内容如下:

{     “req\0” : {         {“rsrc” : “ldo\0”}         {“id” : 3}         {“set” : 0}         {“data” : {             {“uv\0\0” : 1100000}             {“mA\0\0” : 130}         }         }     }} 
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RPM log里边显示是APSS,这个在kernel里边也是有设置的,在msm-pm8916-rpm-regulator.dtsi里的

rpm-regulator-ldoa14 {        compatible = "qcom,rpm-smd-regulator-resource";        qcom,resource-name = "ldoa";        qcom,resource-id = <14>;        qcom,regulator-type = <0>;        qcom,hpm-min-load = <5000>;        status = "disabled";        regulator-l14 {            compatible = "qcom,rpm-smd-regulator";            regulator-name = "8916_l14";            qcom,set = <3>;            status = "disabled";        };    }; 
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MSM的retulator相关的驱动会读取这个,如果有需要发请求的话,会根据这个dtsi的内容,组织kvp,然后通过rpm_request通道发过去。 
rpm_request通道在rpm里边打开的地方是在rpm_handler.cpp里边的Hander::init()函数

void Handler::init(){    smdlPort_ = smdl_open("rpm_requests",                          rpm->ees[ee_].edge,                          SMDL_OPEN_FLAGS_MODE_PACKET,                          rpm->ees[ee_].smd_fifo_sz,                          (smdl_callback_t)rpm_smd_handler,                          this);} 
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在对应的kernel端也有打开,可以参考msm8916.dtsi文件里边的设置。

rpm_bus: qcom,rpm-smd {                compatible = "qcom,rpm-smd";                rpm-channel-name = "rpm_requests";                rpm-channel-type = <15>; /* SMD_APPS_RPM */        }; 
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以下是注册资源的函数和资源的类型: 
所有的资源都通过rpm_register_resource()函数注册。这些资源包括clock, ldo等。具体可以看下面的类型定义。

typedef enum{    RPM_TEST_REQ               = 0x74736574, // 'test' in little endiant    RPM_CLOCK_0_REQ            = 0x306b6c63, // 'clk0' in little endian; misc clocks [CXO, QDSS, dcvs.ena]    RPM_CLOCK_1_REQ            = 0x316b6c63, // 'clk1' in little endian; bus clocks [pcnoc, snoc, sysmmnoc]    RPM_CLOCK_2_REQ            = 0x326b6c63, // 'clk2' in little endian; memory clocks [bimc]    RPM_CLOCK_QPIC_REQ         = 0x63697071, // 'qpic' in little endian; clock [qpic]    RPM_BUS_SLAVE_REQ          = 0x766c7362, // 'bslv' in little endian    RPM_BUS_MASTER_REQ         = 0x73616d62, // 'bmas' in little endian    RPM_BUS_SPDM_CLK_REQ       = 0x63707362, // 'bspc' in little endian    RPM_BUS_MASTER_LATENCY_REQ = 0x74616c62, // 'blat' in little endian    RPM_SMPS_A_REQ             = 0x61706D73, // 'smpa' in little endian    RPM_LDO_A_REQ              = 0x616F646C, // 'ldoa'  in little endian    RPM_NCP_A_REQ              = 0x6170636E, // 'ncpa'  in little endian    RPM_VS_A_REQ               = 0x617376,   // 'vsa'   in little endian    RPM_CLK_BUFFER_A_REQ       = 0x616B6C63, // 'clka' in little endian    RPM_BOOST_A_REQ            = 0x61747362, // 'bsta' in little endian    RPM_SMPS_B_REQ             = 0x62706D73, // 'smpb' in little endian    RPM_LDO_B_REQ              = 0x626F646C, // 'ldob'  in little endian    RPM_NCP_B_REQ              = 0x6270636E, // 'ncpb'  in little endian    RPM_VS_B_REQ               = 0x627376,   // 'vsb'   in little endian    RPM_CLK_BUFFER_B_REQ       = 0x626B6C63, // 'clk' in little endian    RPM_BOOST_B_REQ            = 0x62747362, // 'bstb' in little endian    RPM_SWEVENT_REQ            = 0x76657773, // 'swev' in little endian    RPM_OCMEM_POWER_REQ        = 0x706d636f, // 憃cmp?in little endian    RPM_RBCPR_REQ              = 0x727063,   // 'cpr'in little endian    RPM_GPIO_TOGGLE_REQ        = 0x6F697067, // 'gpio' in little endian:[gpio0,gpio1,gpio2]} rpm_resource_type; 
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RPM Resouce Registration

  1. rpm_register_resource():
Gpio_toggle.c (x:\j3_ctc\nhlos\rpm_proc\core\power\rpm\common):    rpm_register_resource(RPM_GPIO_TOGGLE_REQ, 3, sizeof(gpio_toggle_inrep), gpio_toggle_xlate, gpio_toggle_apply, 0);Icb_rpm_spdm_req.c (x:\j3_ctc\nhlos\rpm_proc\core\buses\icb\src\common):  rpm_register_resource( RPM_BUS_SPDM_CLK_REQ,Ocmem_resource.c (x:\j3_ctc\nhlos\rpm_proc\core\power\ocmem\src):    rpm_register_resource(RPM_OCMEM_POWER_REQ, 3, sizeof(rpm_ocmem_vote_int_rep), rpm_ocmem_xlate, rpm_ocmem_apply, 0);Pm_rpm_boost_trans_apply.c (x:\j3_ctc\nhlos\rpm_proc\core\systemdrivers\pmic\npa\src\rpm):            rpm_register_resource(resourceType, num_npa_resources + 1 , sizeof(pm_npa_boost_int_rep), pm_rpm_boost_translation, pm_rpm_boost_apply, (void *)boost_data);Pm_rpm_clk_buffer_trans_apply.c (x:\j3_ctc\nhlos\rpm_proc\core\systemdrivers\pmic\npa\src\rpm):         rpm_register_resource(resourceType, num_npa_resources + 1, Pm_rpm_ldo_trans_apply.c (x:\j3_ctc\nhlos\rpm_proc\core\systemdrivers\pmic\npa\src\rpm):            rpm_register_resource(resourceType, num_npa_resources + 1, sizeof(pm_npa_ldo_int_rep), pm_rpm_ldo_translation, pm_rpm_ldo_apply, (void *)ldo_data);Pm_rpm_smps_trans_apply.c (x:\j3_ctc\nhlos\rpm_proc\core\systemdrivers\pmic\npa\src\rpm):            rpm_register_resource(resourceType, num_npa_resources + 1, sizeof(pm_npa_smps_int_rep), pm_rpm_smps_translation, pm_rpm_smps_apply, (void *)smps_data);Pm_rpm_vs_trans_apply.c (x:\j3_ctc\nhlos\rpm_proc\core\systemdrivers\pmic\npa\src\rpm):            rpm_register_resource(resourceType, num_npa_resources + 1, sizeof(pm_npa_vs_int_rep), pm_rpm_vs_translation, pm_rpm_vs_apply, (void *)vs_data);        Rpmserver.cpp (x:\j3_ctc\nhlos\rpm_proc\core\power\rpm\server):void rpm_register_resourceRpmserver.h (x:\j3_ctc\nhlos\rpm_proc\core\api\power):void rpm_register_resourceRpm_npa.cpp (x:\j3_ctc\nhlos\rpm_proc\core\power\rpm\server):    rpm_register_resource(resource, num_npa_resources, sizeof(npa_request_data_t), rpm_npa_xlate, rpm_npa_apply, adapter);Rpm_npa.cpp (x:\j3_ctc\nhlos\rpm_proc\core\power\rpm\server):    rpm_register_resource(resource, num_npa_resources, sizeof(npa_request_data_t), rpm_npa_xlate, rpm_npa_apply, adapter);Rpm_test_resource.cpp (x:\j3_ctc\nhlos\rpm_proc\core\power\rpm\server):    rpm_register_resource(RPM_TEST_REQ, 1, 4, rpm_test_xlate, rpm_test_apply, 0);Swevent.c (x:\j3_ctc\nhlos\rpm_proc\core\power\rpm\common):    rpm_register_resource(RPM_SWEVENT_REQ, 1, sizeof(swevent_inrep), rpm_swevent_xlate, rpm_trace_control, 0); 
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所有的资源都是通过rpm_register_resource函数注册。可以看到像RPM_BUS_SPDM_CLK_REQ,RPM_GPIO_TOGGLE_REQ都是通过这个接口直接注册的。

  1. NPA相关也是通过rpm_register_resource注册,但是用了NPA的driver去实际注册资源和使用资源。 
    NPA相关的两个注册接口是:rpm_create_npa_adapter(),rpm_create_npa_settling_adapter()。 
    可以看到这两个就注册了三个CLOCK相关的资源,
---- rpm_create_npa_adapter Matches (8 in 5 files) ----ClockRPM.c :  clk0_adapter = rpm_create_npa_adapter(RPM_CLOCK_0_REQ, 3); // Misc clocks: [CXO, QDSS, dcvs.ena]ClockRPM.c :  clk1_adapter = rpm_create_npa_adapter(RPM_CLOCK_1_REQ, 2); // Bus clocks: [pcnoc, snoc]Rpmserver.h :rpm_npa_adapter rpm_create_npa_adapter(rpm_resource_type resource, unsigned num_npa_resources);Rpm_npa.cpp :rpm_npa_adapter rpm_create_npa_adapter(rpm_resource_type resource, unsigned num_npa_resources)---- rpm_create_npa_settling_adapter Matches (5 in 5 files) ----ClockRPM.c :  clk2_adapter = rpm_create_npa_settling_adapter(RPM_CLOCK_2_REQ, 1); // Memory clocks: [bimc ]Rpmserver.h :rpm_npa_adapter rpm_create_npa_settling_adapter(rpm_resource_type resource, unsigned num_npa_resources);Rpm_npa.cpp :rpm_npa_adapter rpm_create_npa_settling_adapter(rpm_resource_type resource, unsigned num_npa_resources) 
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NPA client的创建函数是:npa_create_sync_client() 
NPA clien request的函数是:npa_issue_required_request() 
NPA client创建并request这个资源,必须要适用像下面这样的npa node。这个可以直接像下面这样定义。然后再使用。步骤如下:

1.定义npa node definition

static npa_resource_definition sleep_uber_resource[] =     {       {        "/sleep/uber",        /* Name */        "on/off",             /* Units */        0x7,                  /* Max State */        &npa_or_plugin,       /* Plugin */        NPA_RESOURCE_DEFAULT, /* Attributes */        NULL,                 /* User Data */      }    };    npa_node_definition sleep_uber_node =     {       "/node/sleep/uber", /* name */      sleep_uber_driver,  /* driver_fcn */      NPA_NODE_DEFAULT,   /* attributes */      NULL,               /* data */      0, NULL,            /* dependency count, dependency list */      NPA_ARRAY(sleep_uber_resource)    }; 
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2.npa_define_node(&sleep_uber_node, initial_state, NULL),调用这个函数初始化这个NPA node 
3.创建Client

uber_node_handle = npa_create_sync_client("/sleep/uber",                                            "sleep",                                            NPA_CLIENT_REQUIRED); 
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4.npa_issue_required_request(uber_node_handle, request) : request

RPM Resource handle

当子系统通过share memory发送请求给RPM。RPM负责处理这些请求并设置。RPM处理请求的流程如下: 
SMD IRQ ->smd_isr()->rpm_smd_handler() [在Handler::init函数中注册的,rpm_request channel的SMD处理函数]->Handler::queue()->schedule_me()->Handler::execute_until()->Handler::processMessage()->resource_ee_request()->发到每个资源注册xlate然后再调用apply等

下面以高通控制DDR频率(BIMC)的过程为例,看一下kernel这边怎么发送请求给RPM的。 
device tree设置如下:

cpubw: qcom,cpubw@0 {        reg = <0 4>;        compatible = "qcom,devbw";        governor = "cpufreq";        qcom,src-dst-ports = <1 512>;        qcom,active-only;        qcom,bw-tbl = //这个频率表对应RPM中BIMC频率表,不过删掉了50MHz和9.6MHz。            /*  73 9.60 MHz */            /* 381  50MHz */            <  762 /* 100 MHz */>,            < 1525 /* 200 MHz */>,            < 3051 /* 400 MHz */>,            < 4066 /* 533 MHz */>;    }; 
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对应的kernel代码在devfeq_devbw.c文件。根据算法算出当前应该设定的ddr总线频率之后,最后通过以下顺序发消息给RPM。这里暂时不讨论按什么规则选择需要的频率的,只看按什么路径发频率给RPM的。 
set_bw()->msm_bus_scale_client_update_request()->update_request_adhoc()[msm_bus_arb_adhoc.c]->update_path()->msm_bus_commit_data()->flush_bw_data()->send_rpm_msg()->msm_rpm_send_message()

System Sleep Overview

RPM除了对Clock和LDO等资源的管理之外,还管理整个系统睡眠。 
这里写图片描述

可以看到睡眠并不是通过shared memory发送消息给RPM的,而是子系统通过设置对应的SPM,SPM触发RPM相应的中断来完成的。 
kernel这边设置spm的模式的设置如下:

enum {    MSM_SPM_MODE_DISABLED,    MSM_SPM_MODE_CLOCK_GATING,    MSM_SPM_MODE_RETENTION,    MSM_SPM_MODE_GDHS,    MSM_SPM_MODE_POWER_COLLAPSE,//设置成这个状态之后,对应的SPM应该就会触发RPM的对应的shutdown中断    MSM_SPM_MODE_NR}; 
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rpm中,与哪几个子系统传递接收message,然后和哪几个子系统的SPM进行交互,交互的中断号是多少的设置如下:

static SystemData temp_config_data ={    .num_ees = 4, // 4 EE's, [apps, modem, pronto, tz]    .ees    = (EEData[] ) {        [0] = {            .edge      = SMD_APPS_RPM,            .smd_fifo_sz = 1024,            .ee_buflen = 256,            .priority  = 4,            .wakeupInt = (1 << 5) | (1 << 7),            .spm       = {                             .numCores = 1,                             .bringupInts  = (unsigned[]) {  15 },                             .bringupAcks  = (unsigned[]) {  20 },                             .shutdownInts = (unsigned[]) {  14 },//这个应该是SPM睡眠的中断号                             .shutdownAcks = (unsigned[]) {   4 },                         },        },        [1] = {            .edge      = SMD_MODEM_RPM,            .smd_fifo_sz = 1024,            .ee_buflen = 1024,            .priority  = 2,            .wakeupInt = (1 << 13) | (1 << 15),            .spm       = {                             .numCores = 1,                             .bringupInts  = (unsigned[]) { 25 },                             .bringupAcks  = (unsigned[]) { 22 },                             .shutdownInts = (unsigned[]) { 24 },                             .shutdownAcks = (unsigned[]) {  6 },                         },        },        [2] = {            .edge      = SMD_RIVA_RPM,            .smd_fifo_sz = 1024,            .ee_buflen = 256,            .priority  = 1,            .wakeupInt = (1 << 17) | (1 << 19),            .spm       = {                             .numCores = 1,                             .bringupInts  = (unsigned[]) { 31 },                             .bringupAcks  = (unsigned[]) { 23 },                             .shutdownInts = (unsigned[]) { 30 },                             .shutdownAcks = (unsigned[]) {  7 },                         },        },        [3] = {            .edge      = SMD_RPM_TZ,            .smd_fifo_sz = 1024,            .ee_buflen = 256,            .priority  = 5,            .wakeupInt = 0,            .spm       = {                             .numCores = 0,                             .bringupInts  = (unsigned[]) { 31 },                             .bringupAcks  = (unsigned[]) { 23 },                             .shutdownInts = (unsigned[]) { 30 },                             .shutdownAcks = (unsigned[]) {  7 },                         },        },    },    .supported_classes   = SUPPORTED_CLASSES,    .supported_resources = SUPPORTED_RESOURCES,    .classes             = (ResourceClassData[SUPPORTED_CLASSES]) { 0 },    .resources           = (ResourceData[SUPPORTED_RESOURCES])    { 0 },    .resource_seeds      = (int16_t[SUPPORTED_RESOURCES])         { 0 },} 
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但还不知道这些中断号到底怎么来的,,中断的个数都是1个,,这个怎么来的也还是不知~ 
这些内容在rpm_spm_init中会读取,然后设置中断。shutdownISR对应的中断处理函数为rpm_spm_shutdown_high_isr。 
这个中断函数会调用rpm_spm_state_machine()处理RPM状态机,进入或者阻止进入睡眠模式等。

void rpm_spm_state_machine(unsigned ee, rpm_spm_entry_reason reason){    INTLOCK();    bool        changed_state = false;    EEData     *ee_state      = &(rpm->ees[ee]);    SetChanger *changer       = ee_state->changer;    do    {        switch(ee_state->subsystem_status)        {            case SPM_AWAKE:                changed_state = FALSE;                if(0 == ee_state->num_active_cores)                 {
//等待所有的core都进入睡眠!!之后才能走到GOITONG TO SLEEP状态!! SPM_CHANGE_STATE(SPM_GOING_TO_SLEEP); } else { // We're awake, so make sure we keep up with any incoming bringup reqs. rpm_acknowledge_spm_handshakes(ee); } break; case SPM_GOING_TO_SLEEP: if(changed_state) { // check for scheduled wakeup uint64_t deadline = 0; if(! rpm_get_wakeup_deadline(ee, deadline)) { deadline = 0; } changer->setWakeTime (deadline); // enqueue immediate set transition to sleep changer->enqueue(RPM_SLEEP_SET, 0); } changed_state = FALSE; // When we've finished selecting the sleep set, we're officially asleep. if((SPM_TRANSITION_COMPLETE == reason) && (RPM_SLEEP_SET == changer->currentSet())) { SPM_CHANGE_STATE(SPM_SLEEPING); } // However, we might get a wakeup request before we've made it all the way to sleep. if(SPM_BRINGUP_REQ == reason) { // Set the preempt flag; this will force the set change to recycle if // it's currently running. It will notice the processor has woken up // and stop performing its work. theSchedule().preempt(); } break; case SPM_SLEEPING: if(changed_state) { // check for scheduled wakeup uint64_t deadline = changer->getWakeTime (); // enqueue scheduled wakeup request changer->enqueue(RPM_ACTIVE_SET, deadline); } changed_state = FALSE; if(ee_state->num_active_cores > 0) { SPM_CHANGE_STATE(SPM_WAKING_UP); } break; case SPM_WAKING_UP: if(changed_state) { // work our way back to the active set if(RPM_SLEEP_SET == changer->currentSet() || changer->inTransition()) { changer->enqueue(RPM_ACTIVE_SET, 0); } } changed_state = FALSE; // check for completion if(RPM_ACTIVE_SET == changer->currentSet() && !changer->inTransition()) { SPM_CHANGE_STATE(SPM_AWAKE); } break; } } while(changed_state); INTFREE();}
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最终会跑到SetChanger::enqueue()里。

RPM与MPM的交互

这里写图片描述

RPM 状态读取

rpm的状态读取,在/d/rpm_stats里边可以读到AP这边设置的几个APSS,MPSS,PRONTO等几个对应的RPM状态。 
读的内容当然也是从rpm_request这个shared memory里边读的。相应的设置在msm8916-pm.dts文件里边有。

qcom,rpm-stats@29dba0 {        compatible = "qcom,rpm-stats";        reg = <0x29dba0 0x1000>;        reg-names = "phys_addr_base";        qcom,sleep-stats-version = <2>;    };    qcom,rpm-master-stats@60150 {        compatible = "qcom,rpm-master-stats";        reg = <0x60150 0x2030>;        qcom,masters = "APSS", "MPSS", "PRONTO";        qcom,master-stats-version = <2>;        qcom,master-offset = <4096>;    };    qcom,rpm-rbcpr-stats@0x29daa0  {        compatible = "qcom,rpmrbcpr-stats";        reg = <0x29daa0 0x1a0000>;        qcom,start-offset = <0x190010>;    };

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[***.144.177.141]2024年04月10日 17时09分58秒