CRTC_RW_SELECT
~(CRTC_RW_SELECT | SHADOW_EN | SHADOW_RW_EN), par);
aty_st_lcd(LCD_GEN_CNTL, (crtc->lcd_gen_cntl & ~CRTC_RW_SELECT) |
~(CRTC_RW_SELECT | SHADOW_EN | SHADOW_RW_EN), par);
aty_st_lcd(LCD_GEN_CNTL, (crtc->lcd_gen_cntl & ~CRTC_RW_SELECT) |
crtc->lcd_gen_cntl = aty_ld_lcd(LCD_GEN_CNTL, par) & ~CRTC_RW_SELECT;