MT6761/MT6762/MT6765 How to trigger MRDUMP_KEY

tangh

长按power key 就可以触发dump，对于解决卡死类的问题有帮助

how to enable?

1、Please find out the platform dts file

1. example:kernel-4.9/arch/arm64/boot/mediatek/mt6761.dts

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2、search for mrdump key word and you will see below text

1.   mrdump_ext_rst: mrdump_ext_rst {
   
2. compatible = "mediatek, mrdump_ext_rst-eint";（注意mediatek, mrdump_ext_rst-eint中逗号之后有个空格）
   
3. source = "EINT";
   
4. mode = "IRQ";
   
5. status = "okay";
   
6. };
   
7. Change as below, saved and rebuild bootimage
   
8. 
   
9. mrdump_ext_rst: mrdump_ext_rst {
   
10. compatible = "mediatek, mrdump_ext_rst-eint";
    
11. source = "SYSRST";
    
12. mode = "IRQ";
    
13. status = "okay";
    
14. };

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3、How to trigger MRDUMP_KEY

1. 
   
2. Please long press power key(you may use power + volumn up , but need another patch) for around 9 seconds
   
3. 
   
4. Please do have a watch on hand to confirm the time in seconds
   
5. 
   
6. Please do not press longer than 15 seconds , if press too long , external PMIC will recognize as battery lost and everything is lost

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