default or selected kernelversion does not have config value CONFIG_OMAP2_DSS_USE_DSI_PLL.
Result is shown for kernelversion 5.4.69

Use DSI PLL for PCLK (EXPERIMENTAL)

configname: CONFIG_OMAP2_DSS_USE_DSI_PLL

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>OMAP2/3 Display Subsystem support (EXPERIMENTAL)
└─>Use DSI PLL for PCLK (EXPERIMENTAL)
In linux kernel since version 2.6.33 (release Date: 2010-02-24)  
Use DSI PLL to generate pixel clock. Currently only for DPI output.
DSI PLL can be used to generate higher and more precise pixel clocks.