高通SDM450+android9.0读显示屏ID

左手的ㄟ右手 2022-11-10 14:20 453阅读 0赞

1.读屏厂OTP时写入DA寄存器的值

1) 确定驱动IC厂家指定的读取ID的命令  
static char id\_cmd\[\] = \{0xDA, 0x00, 0x06, 0xA0\};  
static struct mipi\_dsi\_cmd sc600\_800p\_id\_command =  
\{sizeof(id\_cmd), id\_cmd, 0x00\};

\#define ILI9881C\_0D\_800P\_VIDEO\_SIGNATURE 0x005A //读出来ID和厂家写入的ID值来比较  
2) 让读ID的结构体指针指向上面的读ID指令  
pinfo->mipi.panel\_read\_cmd = &sc600\_800p\_id\_command;  
pinfo->mipi.signature = ILI9881C\_0D\_800P\_VIDEO\_SIGNATURE;  
3) mdss\_dsi\_read\_panel\_signature()从LCM读出ID并比较  
// panel\_read\_cmds指向读ID的命令结构体sc600\_800p\_id\_command  
ret = mdss\_dsi\_cmds\_tx(mipi, mipi->panel\_read\_cmds, 1, 0);  
if (ret)  
goto exit\_read\_signature;  
//实际都回来的\*lp是4个字节，比如0x27005a21  
result = mdss\_dsi\_cmds\_rx(mipi, &lp, 1, 1);

if (!result)  
goto exit\_read\_signature;  
  
data = ntohl(\*lp);  
data = data >> 8;//取高8位  
data = data & 0xffff;//取读出来的2个字节，比如时0x005a  
if (data != panel\_signature)  
ret = 1;

2.读驱动IC的ID

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xvb25nRW1iZWRkZWQ_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xvb25nRW1iZWRkZWQ_size_16_color_FFFFFF_t_70 1][]

打印的信息如下：

\[1300\] mdss\_dsi\_read\_panel\_signature()--->\*rp=0x98983500,ID4\[00\]=0x98,device\_id=0x980000  
\[1330\] mdss\_dsi\_read\_panel\_signature()--->\*rp=0x81813500,ID4\[01\]=0x81,device\_id=0x988100  
\[1350\] mdss\_dsi\_read\_panel\_signature()--->\*rp=0x1c1c3500,ID4\[02\]=0x1c,device\_id=0x98811c

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xvb25nRW1iZWRkZWQ_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20210318201812236.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xvb25nRW1iZWRkZWQ=,size_16,color_FFFFFF,t_70