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本帖最后由 qinqin 于 2015-6-6 02:52 編輯
好久沒寫過筆記了，這次難得遇到那么全的補丁，從上層直通底層，又碰巧在跟蹤接口方面是我的弱項，所以不分析一下太對不住自己了。。。
分析方法由上到下,從接口往底層跟。
接口的使用方法：
import android.view.DisplayManagerAw;
final DisplayManagerAw mDisplayManager = (DisplayManagerAw) mContext.getSystemService(Context.DISPLAY_SERVICE_AW);
int hdmiMode
hdmiMode = mDisplayManager.getSuitableHdmiNativeMode();
返回的hdmiMode是frameworks/base/core/java/android/view/DisplayManagerAw.java 對應的模式，比如 5對應 720P_60HZ, 10對應1080P_60HZ
android/frameworks/base/core/java/android/view/DisplayManagerAw.java
public int getSuitableHdmiNativeMode()
{
int displayno = 0;
int i;
try
{ // 從最高分辨率遍歷所有Hdmi分辨率，測試哪一項是支持的。
for (i = DISPLAY_TVFORMAT_1080P_60HZ; i >= DISPLAY_TVFORMAT_480I; i--)
{
if (mService.isSupportHdmiNativeMode(i) == 1) // 這一步是關鍵
return i;
}
return -1;
}
catch (RemoteException ex)
{
return -1;
}
}
mService.isSupportHdmiNativeMode(i) 是 mService 里面的方法，所以找mService的類。
private IDisplayManagerAw mService; ---> import android.view.IDisplayManagerAw;
---> android\frameworks\base\core\java\android\view\IDisplayManagerAw.aidl
關鍵代碼：
interface IDisplayManagerAw
{
// ... 省略
int isSupportHdmiNativeMode(int mode);
}
對應：android\frameworks\base\services\java\com\android\serv\DisplayManagerServiceAw.java
public class DisplayManagerServiceAw extends IDisplayManagerAw.Stub
{
private static final String TAG = "DisplayManagerServiceAw";
// 聲明本地方法，明顯是JNI方法
private native int nativeIsSupportHdmiNativeMode(int mode);
// ... 省略
public int isSupportHdmiNativeMode(int mode)
{
return nativeIsSupportHdmiNativeMode(mode);
}
}
去JNI目錄看看：
android\frameworks\base\services/jni/com_android_server_DisplayManagerServiceAw.cpp
namespace android
{
// ... 省略代碼
// 這里是具體實現
static jint isSupportHdmiNativeMode_native(JNIEnv *env, jobject clazz,int mode)
{ // Client ??? 發的是這個命令 DISPLAY_CMD_ISSUPPORTHDMINATIVEMODE
return SurfaceComposerClient::setDisplayProp(DISPLAY_CMD_ISSUPPORTHDMINATIVEMODE,mode,0,0);
}
static JNINativeMethod method_table[] = {
// ... 省略其他映射
// nativeIsSupportHdmiNativeMode() 實際調用的是 isSupportHdmiNativeMode_native()
{ "nativeIsSupportHdmiNativeMode", "(I)I", (void*)isSupportHdmiNativeMode_native },
};
int register_android_server_DisplayManagerServiceAw(JNIEnv *env)
{// 注意這里
jclass clazz = env->FindClass("com/android/server/DisplayManagerServiceAw");
if (clazz == NULL)
{
ALOGE("Can't find com/android/server/DisplayManagerServiceAw");
return -1;
}
// 注意這里，與 DisplayManagerServiceAw 有對應關系
return jniRegisterNativeMethods(env, "com/android/server/DisplayManagerServiceAw",
method_table, NELEM(method_table));
}
};
看接收命令處實現了什么：
android/framework/native/include/ui/DisplayCommand.h
#define DISPLAY_CMD_ISSUPPORTHDMINATIVEMODE 30
看其實現：android/framework/native/services/surfaceflinger/DisplayDispatcher.cpp
int DisplayDispatcher::setDispProp(int cmd,int param0,int param1,int param2)
{
switch(cmd)
{
// ... 省略
case DISPLAY_CMD_ISSUPPORTHDMINATIVEMODE:
return mDevice->issupporthdminativemode(mDevice,param0);
}
}
mDevice下的方法 issupporthdminativemode()，找 mDevice 對象
display_device_t* mDevice; 是在 DisplayDispatcher.h 中定義。
display_device_t 結構體在 android/framework/native/include/hardware/display.h
struct display_device_t
{
// ... 省略
/*判斷某種hdmi制式是否被電視本地支持*/
int (*setdisplayareapercent)(struct display_device_t *dev, int displayno,int percent);
// ... 省略
};
是一個函數指針，看其指向了哪里：android/framework/native/include/hardware/display.cpp
android/device/softwinner/wing-common/hardware/libhardware/display/display.cpp
static int open_display(const struct hw_module_t* module, const char* name,
struct hw_device_t** device)
{
// ... 代碼省略
ctx->device.issupporthdminativemode = display_issupporthdminativemode;
// ... 代碼省略
return status;
}
// 實現的地方
int display_issupporthdminativemode(struct display_device_t *dev,int mode)
{
struct display_context_t* ctx = (struct display_context_t*)dev;
if(ctx)
{
if(ctx->mFD_disp)
{
unsigned long args[4];
args[0] = 0;
// 這里通過最開始傳進來的 DISPLAY_TVFORMAT_1080P_60HZ ...
// 實際上是查表 g_tv_para[] mode 跟 g_tv_para[ i].mode 比較。
// 將得到的 g_tv_para[ i].driver_mode 通過 ioctl 傳遞給驅動
args[1] = display_get_driver_tv_format(mode);
// 這里是往設備驅動發送 DISP_CMD_HDMI_NATIVE_SUPPORT_MODE 命令
if(ioctl(ctx->mFD_disp,DISP_CMD_HDMI_NATIVE_SUPPORT_MODE,args))
{
return 1;
}
}
}
return 0;
}
// 這里就是它的實現，從代碼上很容易看到是在查表
static int display_get_driver_tv_format(int format)
{
unsigned int i = 0;
for(i=0; i<sizeof(g_tv_para)/sizeof(struct tv_para_t); i++)
{
if(g_tv_para[ i].mode == format)
{
return g_tv_para[ i].driver_mode;
}
}
return -1;
}
// 這里就是這張表的樣子
struct tv_para_t
{
int type;// bit3:cvbs, bit2:ypbpr, bit1:vga, bit0:hdmi
int mode;
int width;
int height;
int valid_width;
int valid_height;
int driver_mode;
};
static struct tv_para_t g_tv_para[]=
{
{8, DISPLAY_TVFORMAT_NTSC, 720, 480, 690, 450, DISP_TV_MOD_NTSC},
{8, DISPLAY_TVFORMAT_PAL, 720, 576, 690, 546, DISP_TV_MOD_PAL},
{8, DISPLAY_TVFORMAT_PAL_M, 720, 576, 690, 546, DISP_TV_MOD_PAL_M},
{8, DISPLAY_TVFORMAT_PAL_NC, 720, 576, 690, 546, DISP_TV_MOD_PAL_NC},
{5, DISPLAY_TVFORMAT_480I, 720, 480, 690, 450, DISP_TV_MOD_480I},
{5, DISPLAY_TVFORMAT_576I, 720, 576, 690, 546, DISP_TV_MOD_576I},
{5, DISPLAY_TVFORMAT_480P, 720, 480, 690, 450, DISP_TV_MOD_480P},
{5, DISPLAY_TVFORMAT_576P, 720, 576, 690, 546, DISP_TV_MOD_576P},
{5, DISPLAY_TVFORMAT_720P_50HZ, 1280, 720, 1220, 690, DISP_TV_MOD_720P_50HZ},
{5, DISPLAY_TVFORMAT_720P_60HZ, 1280, 720, 1220, 690, DISP_TV_MOD_720P_60HZ},
{5, DISPLAY_TVFORMAT_1080I_50HZ, 1920, 1080, 1880, 1040, DISP_TV_MOD_1080I_50HZ},
{5, DISPLAY_TVFORMAT_1080I_60HZ, 1920, 1080, 1880, 1040, DISP_TV_MOD_1080I_60HZ},
{1, DISPLAY_TVFORMAT_1080P_24HZ, 1920, 1080, 1880, 1040, DISP_TV_MOD_1080P_24HZ},
{5, DISPLAY_TVFORMAT_1080P_50HZ, 1920, 1080, 1880, 1040, DISP_TV_MOD_1080P_50HZ},
{5, DISPLAY_TVFORMAT_1080P_60HZ, 1920, 1080, 1880, 1040, DISP_TV_MOD_1080P_60HZ},
{1, DISPLAY_TVFORMAT_1080P_25HZ, 1920, 1080, 1880, 1040, DISP_TV_MOD_1080P_25HZ},
{1, DISPLAY_TVFORMAT_1080P_30HZ, 1920, 1080, 1880, 1040, DISP_TV_MOD_1080P_30HZ},
{1, DISPLAY_TVFORMAT_1080P_24HZ_3D_FP, 1920, 1080, 1920, 1080, DISP_TV_MOD_1080P_24HZ_3D_FP},
{1, DISPLAY_TVFORMAT_720P_50HZ_3D_FP, 1280, 720, 1280, 720, DISP_TV_MOD_720P_50HZ_3D_FP},
{1, DISPLAY_TVFORMAT_720P_60HZ_3D_FP, 1280, 720, 1280, 720, DISP_TV_MOD_720P_60HZ_3D_FP},
{2, DISPLAY_VGA_H1680_V1050, 1668, 1050, 1668, 1050, DISP_VGA_H1680_V1050},
{2, DISPLAY_VGA_H1440_V900, 1440, 900, 1440, 900, DISP_VGA_H1440_V900},
{2, DISPLAY_VGA_H1360_V768, 1360, 768, 1360, 768, DISP_VGA_H1360_V768},
{2, DISPLAY_VGA_H1280_V1024, 1280, 1024, 1280, 1024, DISP_VGA_H1280_V1024},
{2, DISPLAY_VGA_H1024_V768, 1024, 768, 1204, 768, DISP_VGA_H1024_V768},
{2, DISPLAY_VGA_H800_V600, 800, 600, 800, 600, DISP_VGA_H800_V600},
{2, DISPLAY_VGA_H640_V480, 640, 480, 640, 480, DISP_VGA_H640_V480},
{2, DISPLAY_VGA_H1440_V900_RB, 1440, 900, 1440, 900, DISP_VGA_H1440_V900},
{2, DISPLAY_VGA_H1920_V1080, 1920, 1080, 1920, 1080, DISP_VGA_H1920_V1080},
{2, DISPLAY_VGA_H1280_V720, 1280, 720, 1280, 720, DISP_VGA_H1280_V720},
};
// 繼續分析 先看 DISP_CMD_HDMI_NATIVE_SUPPORT_MODE 命令的定義
android/device/softwinner/common/hardware/include/drv_display.h
typedef enum tag_DISP_CMD
{
// ... 省略
//----hdmi----
DISP_CMD_HDMI_ON = 0x1c0,
DISP_CMD_HDMI_OFF = 0x1c1,
DISP_CMD_HDMI_SET_MODE = 0x1c2,
DISP_CMD_HDMI_GET_MODE = 0x1c3,
DISP_CMD_HDMI_SUPPORT_MODE = 0x1c4,
DISP_CMD_HDMI_GET_HPD_STATUS = 0x1c5,
DISP_CMD_HDMI_SET_SRC = 0x1c6,
DISP_CMD_HDMI_NATIVE_SUPPORT_MODE = 0x1c7, <----
// ... 省略
}
接下來分析Linux 設備驅動接到這個命令之后會怎么處理。
lichee/linux-3.4/include/linux/drv_display.h
typedef enum tag_DISP_CMD
{
// ... 省略
//----hdmi----
DISP_CMD_HDMI_ON = 0x1c0,
DISP_CMD_HDMI_OFF = 0x1c1,
DISP_CMD_HDMI_SET_MODE = 0x1c2,
DISP_CMD_HDMI_GET_MODE = 0x1c3,
DISP_CMD_HDMI_SUPPORT_MODE = 0x1c4,
DISP_CMD_HDMI_GET_HPD_STATUS = 0x1c5,
DISP_CMD_HDMI_SET_SRC = 0x1c6,
DISP_CMD_HDMI_NATIVE_SUPPORT_MODE = 0x1c7, <----
}__disp_cmd_t;
看看接收到這個命令之后做了些什么: 這里是驅動程序
linux-3.4/drivers/video/sun7i/disp/dev_disp.c
long disp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
// ... 省略一些代碼
switch(cmd)
{
// ... 省略一大波 case 代碼
// 這里調用了 BSP_disp_hdmi_check_native_support_mode()
case DISP_CMD_HDMI_NATIVE_SUPPORT_MODE:
ret = BSP_disp_hdmi_check_native_support_mode(ubuffer[0], ubuffer[1]);
break;
// ... 省略一大波 case 代碼
default:
break;
}
return ret;
}
定義在 linux-3.4\drivers\video\sun7i\disp\de_bsp\de\disp_display.h
extern __s32 BSP_disp_hdmi_check_native_support_mode(__u32 sel, __u8 mode);
看看 BSP_disp_hdmi_check_native_support_mode() 是怎么實現的
linux-3.4/drivers/video/sun7i/disp/de_bsp/de/disp_hdmi.c
__s32 BSP_disp_hdmi_check_native_support_mode(__u32 sel, __u8 mode)
{
if(gdisp.init_para.hdmi_native_mode_support)
{
// 如果該函數指針有被賦值則調用 尼瑪... 又來一次...
return gdisp.init_para.hdmi_native_mode_support(mode);
}
else
{
DE_WRN("hdmi_native_mode_support is NULL\n");
return DIS_NOT_SUPPORT;
}
}
gdisp的結構體定義在這：linux-3.4\drivers\video\sun7i\disp\de_bsp\de\disp_display.h
typedef struct
{
__disp_bsp_init_para init_para;//para from driver
// ... 省略
}__disp_dev_t;
extern __disp_dev_t gdisp;
__disp_bsp_init_para 結構體定義
typedef struct
{
// ... 省略
// 這里新增了一個成員
__s32 (*hdmi_native_mode_support)(__disp_tv_mode_t mode);
}__disp_bsp_init_para;
看 gdisp.init_para 初始化的地方：linux-3.4/drivers/video/sun7i/disp/de_bsp/de/disp_hdmi.c
__s32 BSP_disp_set_hdmi_func(__disp_hdmi_func * func)
{
// ... 省略代碼
// ... 無語了，又來...
gdisp.init_para.hdmi_native_mode_support = func->hdmi_native_mode_support;
return DIS_SUCCESS;
}
hdmi_native_mode_support()是 fun的成員，先看看 fun 的結構 __disp_hdmi_func 這個結構體。
lichee/linux-3.4/include/linux/drv_display.h
typedef struct
{
// ... 省略
// 新增的
__s32 (*hdmi_native_mode_support)(__disp_tv_mode_t mode);
}__disp_hdmi_func;
好了，接著看誰調用了這個 BSP_disp_set_hdmi_func()，往上跟，看func到底指向了哪個函數
linux-3.4\drivers\video\sun7i\disp\Dev_disp.c
__s32 disp_set_hdmi_func(__disp_hdmi_func * func)
{
BSP_disp_set_hdmi_func(func);
return 0;
}
看誰調用了 disp_set_hdmi_func()
linux-3.4\drivers\video\sun7i\hdmi\drv_hdmi.c
__s32 Hdmi_init(void)
{
// ... 省略代碼
// 終于找到了，在這里賦值
disp_func.hdmi_native_mode_support = Hdmi_native_mode_support;
// 在這里調用了 disp_set_hdmi_func()
disp_set_hdmi_func(&disp_func);
return 0;
}
看看 Hdmi_native_mode_support() 的實現
__s32 Hdmi_native_mode_support(__disp_tv_mode_t mode)
{
__u32 hdmi_mode;
switch(mode)
{
case DISP_TV_MOD_480I:
hdmi_mode = HDMI1440_480I;
break;
case DISP_TV_MOD_576I:
hdmi_mode = HDMI1440_576I;
break;
case DISP_TV_MOD_480P:
hdmi_mode = HDMI480P;
break;
case DISP_TV_MOD_576P:
hdmi_mode = HDMI576P;
break;
case DISP_TV_MOD_720P_50HZ:
hdmi_mode = HDMI720P_50;
break;
case DISP_TV_MOD_720P_60HZ:
hdmi_mode = HDMI720P_60;
break;
case DISP_TV_MOD_1080I_50HZ:
hdmi_mode = HDMI1080I_50;
break;
case DISP_TV_MOD_1080I_60HZ:
hdmi_mode = HDMI1080I_60;
break;
case DISP_TV_MOD_1080P_24HZ:
hdmi_mode = HDMI1080P_24;
break;
case DISP_TV_MOD_1080P_50HZ:
hdmi_mode = HDMI1080P_50;
break;
case DISP_TV_MOD_1080P_60HZ:
hdmi_mode = HDMI1080P_60;
break;
case DISP_TV_MOD_1080P_25HZ:
hdmi_mode = HDMI1080P_25;
break;
case DISP_TV_MOD_1080P_30HZ:
hdmi_mode = HDMI1080P_30;
break;
case DISP_TV_MOD_1080P_24HZ_3D_FP:
hdmi_mode = HDMI1080P_24_3D_FP;
break;
case DISP_TV_MOD_720P_50HZ_3D_FP:
hdmi_mode = HDMI720P_50_3D_FP;
break;
case DISP_TV_MOD_720P_60HZ_3D_FP:
hdmi_mode = HDMI720P_60_3D_FP;
break;
default:
hdmi_mode = HDMI720P_50;
break;
}
// 竟然。。。。。。
return Hdmi_hal_native_mode_support(hdmi_mode);
}
繼續分析 Hdmi_hal_native_mode_support()
聲明在此：
linux-3.4\drivers\video\sun7i\hdmi/hdmi_hal.h
extern __s32 Hdmi_hal_native_mode_support(__u32 mode);
實現在此：
linux-3.4\drivers\video\sun7i\hdmi\aw\hdmi_hal.c
__s32 Hdmi_hal_native_mode_support(__u32 mode)
{
if(Hpd_Check() == 0)
{
return 0;
}
else
{
int counter = 1000;
// hdmi_state < 5 ??? 應該是等待 接收 電視中傳過來的數據 里面包含有分辨率這些信息
while(hdmi_state < HDMI_State_Wait_Video_config && counter--)
{
hdmi_delay_ms(1);
}
// 這里實際上是查詢上層傳遞下來的分辨率是否被支持
return Device_Native_Support_VIC[mode];
}
}
先看看數組的定義：
linux-3.4\drivers/video/sun7i/hdmi/aw/hdmi_core.h
extern __u8Device_Native_Support_VIC[512];
linux-3.4\drivers/video/sun7i/hdmi/aw/hdmi_core.c
__u8 Device_Native_Support_VIC[512];
賦值在這里：
linux-3.4\drivers\video\sun7i\hdmi\aw\hdmi_edid.c
// 看樣子這里還不是關鍵
__s32 Parse_VideoData_Block(__u8 *pbuf,__u8 size)
{
int i=0;
while(i<size)
{
Device_Support_VIC[pbuf[ i] &0x7f] = 1;
if(pbuf[ i] &0x80)
{
__inf("Parse_VideoData_Block: VIC %d(native) support\n", pbuf[ i]&0x7f);
// 這里是記錄對應的電視機上支持哪些分辨率 1 表示支持
Device_Native_Support_VIC[pbuf[ i] &0x7f] = 1;
}
else
{
__inf("Parse_VideoData_Block: VIC %d support\n", pbuf[ i]);
}
i++;
}
return 0;
}
通過搜索，看看哪個地方調用了該函數：
linux-3.4\drivers\video\sun7i\hdmi\aw\hdmi_edid.c
這個函數涉及到芯片的HDMI控制器，比較復雜，要是真的深入分析的話，估計要花上好一段時間.
__s32 ParseEDID(void)
{
//collect the EDID ucdata of segment 0
__u8 BlockCount ;
__u32 i,offset ;
__inf("ParseEDID\n");
memset(Device_Support_VIC,0,sizeof(Device_Support_VIC));
// 這里清空了該數組，也就是說，默認全為 0
memset(Device_Native_Support_VIC,0,sizeof(Device_Native_Support_VIC));
memset(EDID_Buf,0,sizeof(EDID_Buf));
isHDMI = 0;
YCbCr444_Support = 0;
DDC_Init(); // 初始化DDC 、使能、復位DDC、設置DDC時鐘
GetEDIDData(0, EDID_Buf);// 讀取數據
// 校驗數據
if( EDID_CheckSum(0, EDID_Buf) != 0)
{
return 0;
}
// 校驗數據頭
if( EDID_Header_Check(EDID_Buf)!= 0)
{
return 0;
}
// 檢查版本
if( EDID_Version_Check(EDID_Buf)!= 0)
{
return 0;
}
Parse_DTD_Block(EDID_Buf + 0x36);
Parse_DTD_Block(EDID_Buf + 0x48);
BlockCount = EDID_Buf[0x7E];
if( BlockCount > 0 )
{
if ( BlockCount > 4 )
{
BlockCount = 4 ;
}
// 讀取所有數據塊
for( i = 1 ; i <= BlockCount ; i++ )
{
GetEDIDData(i, EDID_Buf) ;
if( EDID_CheckSum(i, EDID_Buf)!= 0)
{
return 0;
}
if((EDID_Buf[0x80*i+0]==2)/*&&(EDID_Buf[0x80*i+1]==1)*/)
{
if( (EDID_Buf[0x80*i+1]>=1))
{
if(EDID_Buf[0x80*i+3]&0x20)
{
YCbCr444_Support = 1;
__inf("device support YCbCr44 output\n");
if(rgb_only == 1)
{
__inf("rgb only test!\n");
YCbCr444_Support = 0;
}
}
}
offset = EDID_Buf[0x80*i+2];
if(offset > 4)//deal with reserved data block
{
__u8 bsum = 4;
while(bsum < offset)
{
__u8 tag = EDID_Buf[0x80*i+bsum]>>5;
__u8 len = EDID_Buf[0x80*i+bsum]&0x1f;
if( (len >0) && ((bsum + len + 1) > offset) )
{
__inf("len or bsum size error\n");
return 0;
}else
{
if( tag == 1)//ADB
{
Parse_AudioData_Block(EDID_Buf+0x80*i+bsum+1,len);
}
else if( tag == 2)//VDB
{// 記錄下來
Parse_VideoData_Block(EDID_Buf+0x80*i+bsum+1,len);
}
else if( tag == 3)//vendor specific
{
Parse_HDMI_VSDB(EDID_Buf+0x80*i+bsum+1,len);
}
}
bsum += (len +1);
}
}else
{
__inf("no data in reserved block%d\n",i);
}
if(offset >= 4)//deal with 18-byte timing block
{
while(offset < (0x80-18))
{
Parse_DTD_Block(EDID_Buf + 0x80*i + offset);
offset += 18;
}
}else
{
__inf("no datail timing in block%d\n",i);
}
}
}
}
return 0 ;
}
最后總結：
當HDMI接入時，會通過HDMI控制器得到電視的一些信息并且保存起來，而 getSuitableHdmiNativeMode() 這個接口
實際上只是在已被保存下來的信息中查詢得到該電視最高支持的分辨率。
不得不吐槽下，為了實現這個功能，繞來繞去的。。。
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