[POWERPC] Fix sleep on some powerbooks

The PMU backlight code would kick in during sleep/resume even on
machines that use a different backlight method. This breaks
sleep on some PowerBooks.

This fixes it by adding a flag to indicate whether the backlight
is controlled by the PMU, and testing that before trying to use
the PMU to turn off the backlight during sleep.

Signed-off-by: Benjamin Herrenschmidt <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

drivers/macintosh/via-pmu-backlight.c

···
 
 static struct backlight_ops pmu_backlight_data;
 static DEFINE_SPINLOCK(pmu_backlight_lock);
-static int sleeping;
+static int sleeping, uses_pmu_bl;
 static u8 bl_curve[FB_BACKLIGHT_LEVELS];
 
 static void pmu_backlight_init_curve(u8 off, u8 min, u8 max)
···
 
 	spin_lock_irqsave(&pmu_backlight_lock, flags);
 	sleeping = sleep;
-	if (pmac_backlight) {
+	if (pmac_backlight && uses_pmu_bl) {
 		if (sleep) {
 			struct adb_request req;
 
···
 		printk(KERN_ERR "PMU Backlight registration failed\n");
 		return;
 	}
+	uses_pmu_bl = 1;
 	bd->props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
 	pmu_backlight_init_curve(0x7F, 0x46, 0x0E);