Banana Pi M64 Android修改分辨率为480x1280横屏显示

由于项目需要，使用了一块480x1280分辨率的屏，但是M64官方Android系统只提供720p和1280p分辨率的选择，无法正常驱动这块屏。经过长期摸索，终于搞清楚了要修改的文件：

一、修改内核文件 1.lichee/linux-3.10/drivers/video/sunxi/disp2/hdmi/hdmi_core.c 修改自己屏幕的时序。 2.修改Android的hardware文件： android/hardware/aw/hwc/tulip/hwc_uevent.cpp android/hardware/aw/hwc/octopus/hwc_uevent.cpp android/hardware/aw/hwc/astar/hal.cpp android/hardware/aw/hwc/kylin/hal.cpp 修改 DISP_TV_MOD_720P_60HZ和 DISP_TV_MOD_720P_50HZ分辨率为480x1280（原为1280x720）

二、修改布局由于需要横屏显示，所以还需要修改布局，以支持横屏（一）支持横屏显示选项ro.sf.hwrotation 1.android/frameworks/native/services/surfaceflinger/DisplayDevice.h，添加变量     // Current active config     int mActiveConfig;    //修改：支持横屏 // Panel hardware rotation int32_t mHardwareRotation; 去掉    status_t orientationToTransfrom(int orientation,            int w, int h, Transform* tr);的 Static 声明 2.android/frameworks/native/services/surfaceflinger/DisplayDevice.cpp DisplayDevice::DisplayDevice函数添加：     property_get("ro.panel.mountflip", property, "0”);     mPanelMountFlip = atoi(property); // initialize the display orientation transform.
DisplayDevice::orientationToTransfrom函数添加：     //修改：支持橫屏     if (mHardwareRotation && mType == DISPLAY_PRIMARY) {        orientation += mHardwareRotation;         orientation %= 4;     }
switch (orientation) { …
DisplayDevice::setProjection函数添加：     if (!frame.isValid()) {         // the destination frame can be invalid if it has never been set,        // in that case we assume the whole display frame.        //修改：支持橫屏         if (mHardwareRotation == 1 || mHardwareRotation == 3) {             frame = Rect(h, w);         } else {             frame = Rect(w, h);        }         //frame = Rect(w, h);    }
3.android/frameworks/native/services/surfaceflinger/Surfaceflinger.cpp SurfaceFlinger::getDisplayConfigs函数添加：        //修改：支持橫屏 char value[PROPERTY_VALUE_MAX];        property_get("ro.sf.hwrotation", value, "0");        int additionalRot = atoi(value) / 90;        if ((type == DisplayDevice::DISPLAY_PRIMARY) && (additionalRot & DisplayState::eOrientationSwapMask)) {             info.h = hwConfig.width;             info.w = hwConfig.height;             info.xdpi = ydpi;             info.ydpi = xdpi;         }         else {             info.w = hwConfig.width;             info.h = hwConfig.height;             info.xdpi = xdpi;    info.ydpi = ydpi;         }         /*         info.w = hwConfig.width;         info.h = hwConfig.height;         info.xdpi = xdpi;         info.ydpi = ydpi;         */                  info.fps = float(1e9 / hwConfig.refresh);         info.appVsyncOffset = VSYNC_EVENT_PHASE_OFFSET_NS;         info.colorTransform = hwConfig.colorTransform;

经过以上修改后，重新编译内核和源码，终于可以正常横屏显示了，希望能帮到有同样问题的朋友。

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