安卓11中从设置-显示设置hdmi分辨率流程:framework层通过jni控制底层驱动实现，标准驱动模型

packages\apps\Settings\src\com\android\settings\display\HdmiSettings.javaprivate void updateResolution(final ITEM_CONTROL control, final int index) {showWaitingDialog(R.string.dialog_update_resolution);mEnableDisplayListener = false;new Thread() {@Overridepublic void run() {if (ITEM_CONTROL.CHANGE_RESOLUTION == control) {synchronized (mLock) {int display = mSelectDisplayInfo.getDisplayNo();DrmDisplaySetting.updateDisplayInfos();DrmDisplaySetting.updateDisplayModesInfo(mSelectDisplayInfo);int status = DrmDisplaySetting.getCurrentDpyConnState(display);mSelectDisplayInfo.setStatus(status);String[] modes = mSelectDisplayInfo.getOrginModes();Log.v(TAG, "display " + display + ", status=" + status + ", modes=" + modes);if (DPY_STATUS_CONNECTED == status && null != modes && modes.length > 0) {DrmDisplaySetting.setDisplayModeTemp(mSelectDisplayInfo, index);
//                            String mode = Arrays.asList(modes).get(index);
//                            DrmDisplaySetting.setMode(display, mode);if (USED_OFFON_RESOLUTION) {sendSwitchDeviceOffOnMsg(control, SWITCH_STATUS_OFF_ON);} else {Message message = new Message();message.what = MSG_SHOW_CONFIRM_DIALOG;message.obj = control;mHandler.sendMessageDelayed(message, 300);}} else {Message message = new Message();message.what = MSG_UPDATE_STATUS_UI;message.obj = ITEM_CONTROL.REFRESH_DISPLAY_STATUS_INFO;mHandler.sendMessage(message);}}}}}.start();}packages/apps/Settings/src/com/android/settings/display/DrmDisplaySetting.javapublic static void setDisplayModeTemp(DisplayInfo di, int index) {String mode = Arrays.asList(di.getOrginModes()).get(index);setMode(di.getDisplayNo(), mode);tmpSetMode = mode;}public static void setDisplayModeTemp(DisplayInfo di, int index) {String mode = Arrays.asList(di.getOrginModes()).get(index);setMode(di.getDisplayNo(), mode);tmpSetMode = mode;}public static void setMode(int display, String mode) {RkDisplayOutputManager manager = new RkDisplayOutputManager();int result = manager.updateDisplayInfos();int type = manager.getCurrentInterface(display);logd("setMode display=" + display + ", type=" + type + ", mode=" + mode);manager.setMode(display, type, mode);}
frameworks$ vim ./base/core/java/android/os/RkDisplayOutputManager.java
public void setMode(int display, int type, String mode) {String iface = typetoface(type);try {mService.setMode(display, iface, mode);}catch (Exception e) {Log.e(TAG, "Error set mode :" + e);return;}}public RkDisplayOutputManager() {IBinder b = ServiceManager.getService("drm_device_management");if(b == null) {Log.e(TAG, "Unable to connect to display device management service! - is it running yet?");return;}mService = IRkDisplayDeviceManagementService.Stub.asInterface(b);int mMainState = getCurrentDpyConnState(MAIN_DISPLAY);try {// Get main display interfaceString[] display_iface = mService.listInterfaces(MAIN_DISPLAY);if(DBG) Log.d(TAG, "main display iface num is " + display_iface.length);if(display_iface != null && display_iface.length > 0 &&  mMainState==DRM_MODE_CONNECTED) {m_main_iface = new int[display_iface.length];for(int i = 0; i < m_main_iface.length; i++) {if(DBG) Log.d(TAG, display_iface[i]);m_main_iface[i] = ifacetotype(display_iface[i]);}}./base/services/core/java/com/android/server/RkDisplayDeviceManagementService.javapublic void setMode(int display, String iface, String mode) {boolean isSameProperty = false;String lastMode;mdrmModes.setMode(display, iface, mode);}public RkDisplayDeviceManagementService(Context context) {mContext = context;mdrmModes = new RkDisplayModes();mdrmModes.init();IntentFilter hdmiFilter = new IntentFilter();hdmiFilter.addAction(ACTION_PLUGGED);mHdmiReceiver = new HdmiReceiver(mdrmModes);mContext.registerReceiver(mHdmiReceiver,hdmiFilter);}./base/services/core/java/com/android/server/rkdisplay/RkDisplayModes.javapublic void setMode(int display, String iface, String mode){int ifaceType = ifacetotype(iface);String[] mode_str;int idx=0;RkDisplayModes.RkPhysicalDisplayInfo info;Log.w(TAG, "setMode " + mode + " display " + display);if (mode.contains("Auto")) {nativeSetMode(display, ifaceType, mode);//通过本地方法实现} else {mode_str = mode.split("-");for (String mval: mode_str){Log.e(TAG, "setMode split:  " + mval);}if (mode_str.length != 2){return;}idx = Integer.parseInt(mode_str[1]);if (mMainDisplayInfos!=null && idx >= mMainDisplayInfos.length && display==0)idx=0;else if (mAuxDisplayInfos!=null && idx >= mAuxDisplayInfos.length && display==1)idx=0;if (display == 0)info = mMainDisplayInfos[idx];elseinfo = mAuxDisplayInfos[idx];StringBuilder builder = new StringBuilder();builder.append(info.width).append("x").append(info.height);
/*if (info.interlaceFlag == true)builder.append("i");elsebuilder.append("p");
*/builder.append("@");builder.append(String.format(Locale.ENGLISH, "%.2f", info.refreshRate));builder.append("-");builder.append(info.hsync_start);builder.append("-");builder.append(info.hsync_end);builder.append("-");builder.append(info.htotal);builder.append("-");builder.append(info.vsync_start).append("-").append(info.vsync_end).append("-").append(info.vtotal).append("-").append(String.format(Locale.ENGLISH, "%x", info.flags)).append("-").append(info.clock);nativeSetMode(display, ifaceType, builder.toString());}}
base/services/core/jni/com_android_server_rkdisplay_RkDisplayModes.cpp 
#include <rockchip/hardware/outputmanager/1.0/IRkOutputManager.h>  
static void nativeSetMode(JNIEnv* env, jobject obj, jint dpy, jint iface_type, jstring mode)
{const char* mMode = env->GetStringUTFChars(mode, NULL);if (mComposer != nullptr)mComposer->setMode(dpy, mMode); //这里又调用了hal层的方法env->ReleaseStringUTFChars(mode, mMode);
}
static void nativeInit(JNIEnv* env, jobject obj) {mComposer = IRkOutputManager::getService();//通过IRkOutputManager实现hdmi分辨率写入的if (mComposer != nullptr) {mComposer->initial();} else {ALOGD("nativeInit failed to get IRkOutputManager");}
}
./vendor/rockchip/hardware/interfaces/outputmanager/1.0/default/RkOutputManager.cpp
Return<Result> RkOutputManager::setMode(Display display, const hidl_string& mode)
{std::string modeStd(mode.c_str());mHwOutput->setMode(mHwOutput, display, modeStd.c_str());  //找到设备写入的地方return Result::OK;
}
IRkOutputManager* HIDL_FETCH_IRkOutputManager(const char* /* name */) {struct hw_output_device*   mHwOutput;const hw_module_t* hw_module = nullptr;int ret = hw_get_module(HW_OUTPUT_HARDWARE_MODULE_ID, &hw_module);//找到这个设备，获取设备，设备的具体实现在hw_output.cppif (ret == 0) {ret = hw_output_open(hw_module, &mHwOutput);if (ret == 0) {return new RkOutputManager(mHwOutput);} else {LOG(ERROR) << "Passthrough failed to load legacy HAL.";return nullptr;}}else {LOG(ERROR) << "hw_get_module " << HWC_HARDWARE_MODULE_ID<< " failed: " << ret;return nullptr;}
}
hardware/libhardware/modules/hw_output/hw_output.cpp
static int hw_output_device_open(const struct hw_module_t* module,const char* name, struct hw_device_t** device)
{int status = -EINVAL;if (!strcmp(name, HW_OUTPUT_DEFAULT_DEVICE)) {hw_output_private_t* dev = (hw_output_private_t*)malloc(sizeof(*dev));/* initialize our state here *///memset(dev, 0, sizeof(*dev));/* initialize the procs */dev->device.common.tag = HARDWARE_DEVICE_TAG;dev->device.common.version = HW_OUTPUT_DEVICE_API_VERSION_0_1;dev->device.common.module = const_cast<hw_module_t*>(module);dev->device.common.close = hw_output_device_close;dev->device.initialize = hw_output_initialize;dev->device.setMode = hw_output_set_mode; //这里传递一个函数指针，具体设置分辨率的地方
..........
static int hw_output_set_mode(struct hw_output_device* dev, int dpy, const char* mode)
{hw_output_private_t* priv = (hw_output_private_t*)dev;DrmConnector* conn = getValidDrmConnector(priv, dpy);BaseParameter* mBaseParameter = priv->mBaseParmeter;char property[PROPERTY_VALUE_MAX];std::string propertyStr;propertyStr = getPropertySuffix(priv, "persist.vendor.resolution.", dpy);ALOGD("nativeSetMode %s display %d", mode, dpy);if (strcmp(mode, property) !=0) {property_set(propertyStr.c_str(), mode);updateTimeline();struct disp_info info;float vfresh=0.0f;int slot = 0;mBaseParameter->get_disp_info(conn->get_type(), conn->connector_id(), &info);slot = findSuitableInfoSlot(&info, conn->get_type(), conn->connector_id());info.screen_info[slot].type = conn->get_type();info.screen_info[slot].id = conn->connector_id();if (strncmp(mode, "Auto", 4) != 0 && strncmp(mode, "0x0p0-0", 7) !=0) {sscanf(mode,"%dx%d@%f-%d-%d-%d-%d-%d-%d-%x-%d",&info.screen_info[slot].resolution.hdisplay, &info.screen_info[slot].resolution.vdisplay,&vfresh, &info.screen_info[slot].resolution.hsync_start,&info.screen_info[slot].resolution.hsync_end,&info.screen_info[slot].resolution.htotal,&info.screen_info[slot].resolution.vsync_start,&info.screen_info[slot].resolution.vsync_end, &info.screen_info[slot].resolution.vtotal,&info.screen_info[slot].resolution.flags, &info.screen_info[slot].resolution.clock);info.screen_info[slot].resolution.vrefresh = (int)vfresh;} else {info.screen_info[slot].feature|= RESOLUTION_AUTO;memset(&info.screen_info[slot].resolution, 0, sizeof(info.screen_info[slot].resolution));}mBaseParameter->set_disp_info(conn->get_type(), conn->connector_id(), &info);}return 0;
}