[PATCH] atyfb: Blank LCD by turning off backlight voltage

[PATCH] atyfb: Blank LCD by turning off backlight voltage

[Ville Syrjälä]

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This patch makes the blanking code turn the backlight voltage on/off.

-- 
Ville Syrjälä
syrjala@sci.fi
http://www.sci.fi/~syrjala/

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diff -urN linux-orig/drivers/video/aty/atyfb_base.c linux/drivers/video/aty/atyfb_base.c
--- linux-orig/drivers/video/aty/atyfb_base.c	2004-06-17 11:41:21.265972568 +0300
+++ linux/drivers/video/aty/atyfb_base.c	2004-06-17 11:40:45.733374344 +0300
@@ -2464,7 +2464,14 @@
 #ifdef CONFIG_PMAC_BACKLIGHT
 	if ((_machine == _MACH_Pmac) && blank)
 		set_backlight_enable(0);
-#endif /* CONFIG_PMAC_BACKLIGHT */
+#elif defined(CONFIG_FB_ATY_GENERIC_LCD)
+	if (par->lcd_table && blank &&
+	    (aty_ld_lcd(LCD_GEN_CNTL, par) & LCD_ON)) {
+		u32 pm = aty_ld_lcd(POWER_MANAGEMENT, par);
+		pm &= ~PWR_BLON;
+		aty_st_lcd(POWER_MANAGEMENT, pm, par);
+	}
+#endif
 
 	gen_cntl = aty_ld_8(CRTC_GEN_CNTL, par);
 	if (blank > 0)
@@ -2488,7 +2495,15 @@
 #ifdef CONFIG_PMAC_BACKLIGHT
 	if ((_machine == _MACH_Pmac) && !blank)
 		set_backlight_enable(1);
-#endif /* CONFIG_PMAC_BACKLIGHT */
+#elif defined(CONFIG_FB_ATY_GENERIC_LCD)
+	if (par->lcd_table && !blank &&
+	    (aty_ld_lcd(LCD_GEN_CNTL, par) & LCD_ON)) {
+		u32 pm = aty_ld_lcd(POWER_MANAGEMENT, par);
+		pm |= PWR_BLON;
+		aty_st_lcd(POWER_MANAGEMENT, pm, par);
+	}
+#endif
+
 	return 0;
 }