CCK_REG_DSI_PLL_CONTROL
val = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 0);
vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL,
vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, config->dsi_pll.ctrl);
if (wait_for(vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL) &
tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
pll_ctl = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);