how to config the hdmi register for WSVGA resulotion

I want add a resulotion 1024x600 for HDMI.

after check the hdmi register, I found below register configuration need modify.

HDMI_NV_PDISP_SOR_PLL0_0
HDMI_NV_PDISP_SOR_PLL1_0
HDMI_NV_PDISP_SOR_LANE_DRIVER_CURRENT_0
HDMI_NV_PDISP_PE_CURRENT_0
HDMI_NV_PDISP_SOR_IO_PEAK_CURRENT_0
HDMI_NV_PDISP_SOR_PAD_CTLS0_0
CLK_RST_CONTROLLER_PLLD_MISC_0

But I wonder how to modify it. Does anyone known the right configuration ?

Sorry if I’m missing something here, but why would you not want to use xrandr or xorg.conf to set the resolution on the HDMI display?