default or selected kernelversion does not have config value CONFIG_DRM_MSM_DSI_PLL.
Result is shown for kernelversion 6.9.9

Enable DSI PLL driver in MSM DRM

configname: CONFIG_DRM_MSM_DSI_PLL

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Enable DSI PLL driver in MSM DRM
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Choose this option to enable DSI PLL driver which provides DSI
source clocks under common clock framework.