Skip to content

Latest commit

 

History

History
83 lines (66 loc) · 3.97 KB

README.md

File metadata and controls

83 lines (66 loc) · 3.97 KB
Raw

WHAT IS THIS?

This is a LCM Collection for:

  • MTK Kernels
  • LCMs are from others kernels sources, aren't extracted by me!!!

INSTRUCTIONS!

If you wanna use one of the LCMs that is situated here you need a kernel for the SOC of your device, for example MT6580, then you will need to search a kernel for that device, clone it. And see which LCM use your phone. If you know that, you only need to place LCM at drivers/misc/mediatek/lcm, then you will need to add the LCM function, sometimes they are at these files:

  • mt65xx_lcm_list.c
  • mt65xx_lcm_list.h

You only need to add the lines that has a +, for know the name of the LCM Driver you are gonna add you need to check at the .c file of your LCM normally you will find like this: LCM_DRIVER = { .name = "",

Example of MT6757CD:

  • mt65xx_lcm_list.c LCM_DRIVER *lcm_driver_list[] = { +#if defined(HCT_RM67120_DSI_VDO_HD_GVO) + &hct_rm67120_dsi_vdo_hd_gvo, +#endif #if defined(TD4310_TFT60_HXGD_LFHD) &td4310_tft60_hxgd_lfhd_lcm_drv, #endif
  • mt65xx_lcm_list.h #include <lcm_drv.h> +extern LCM_DRIVER hct_rm67120_dsi_vdo_hd_gvo; extern LCM_DRIVER otm1282a_hd720_dsi_vdo_60hz_lcm_drv;

If your device has different SOC, LCM functions can be situated only at mt65xx_lcm_list.h:

Example of a kernel that only have it at mt65xx_lcm_list.h

  • mt65xx_lcm_list.h #define MT65XX_LCM_LIST_H +extern LCM_DRIVER hct_nt35521_dsi_vdo_hd_cmi_55_rx; extern LCM_DRIVER hct_rm68200_dsi_vdo_hd_auo_50_ykl;

     LCM_DRIVER *lcm_driver_list[] = {
 +#if defined(HCT_NT35521_DSI_VDO_HD_CMI_55_RX)
 +    &hct_nt35521_dsi_vdo_hd_cmi_55_rx,
 +#endif
 #if defined(HCT_RM68200_DSI_VDO_HD_AUO_50_YKL)
     &hct_rm68200_dsi_vdo_hd_auo_50_ykl,
 #endif

If the video driver of your kernel use for example set_backlight_cmdq, you will need to modify your LCM driver, for make it work with your kernel.

Example of how to fix this issue:

  • First of all take a look to another LCM of your kernel.

  • Second see how they use set_backlight_cmdq function.

  • Third implement it: - static void lcm_setbacklight(unsigned int level) + static void lcm_setbacklight_cmdq(void *handle, unsigned int level)

     -    .set_backlight = lcm_setbacklight,
 +    .set_backlight_cmdq = lcm_setbacklight_cmdq,

Examples of defconfig modifications for make LCM work:

  • First of all, try to extract defconfig, normally is situated on a file situated at /proc named config.gz. If your device doesn't have this file at /proc, I recommend you to use a defconfig of your kernel, you will need to add it at "arch/arm/configs" if your device is arm, and if your device is arm64 your will need to add it at "arch/arm64/configs".

  • Second, you need to set the correct LCM name, the one that is being used by your device: -CONFIG_CUSTOM_KERNEL_LCM="td4310_fhd_dsi_vdo_chuangwei_malata" +CONFIG_CUSTOM_KERNEL_LCM="hct_rm67120_dsi_vdo_hd_gvo"

  • Third, you need to see which is the HEIGHT and WIDTH of your device, and set the correct values. -CONFIG_LCM_HEIGHT="1920" +CONFIG_LCM_HEIGHT="1280" -CONFIG_LCM_WIDTH="1080" +CONFIG_LCM_WIDTH="720"

  • Fourth, you need to extract the .dts from your stock kernel. And you will need to add it at "arch/arm/boot/dts/mediatek" if your device is arm, and if your device is arm64 you will need to add it at "arch/arm64/boot/dts/mediatek", when you have finished making this, you will need to add the correct dts name at your defconfig. -CONFIG_BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES="mediatek/N1" +CONFIG_BUILD_ARM64_APPENDED_DTB_IMAGE_NAMES="mediatek/MIX"

#If any of these LCMs worked for you, give the corrects credits.