dpu_kms_get_clk_rate
vsync_hz = dpu_kms_get_clk_rate(dpu_kms, "vsync");
max_core_clk_rate = dpu_kms_get_clk_rate(dpu_kms, "core");
unsigned long dpu_kms_get_clk_rate(struct dpu_kms *dpu_kms, char *clock_name);