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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-03-03 17:27:46 +1100
committerPaul Mackerras <paulus@samba.org>2008-03-13 10:09:27 +1100
commitfa19d63488bd108a308f575064779bb69123efbc (patch)
tree97dc8f59e050fd39ac141e0b5e0ddac889ed5580
parent7f172890a8f8744c4005c267ae9e228411ab173f (diff)
downloadlinux-2.6.38-lt-ux500-fa19d63488bd108a308f575064779bb69123efbc.tar.gz
[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 <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--drivers/macintosh/via-pmu-backlight.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/macintosh/via-pmu-backlight.c b/drivers/macintosh/via-pmu-backlight.c
index 741a2e3f4fc..a348bb0791d 100644
--- a/drivers/macintosh/via-pmu-backlight.c
+++ b/drivers/macintosh/via-pmu-backlight.c
@@ -17,7 +17,7 @@
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)
@@ -128,7 +128,7 @@ void pmu_backlight_set_sleep(int sleep)
spin_lock_irqsave(&pmu_backlight_lock, flags);
sleeping = sleep;
- if (pmac_backlight) {
+ if (pmac_backlight && uses_pmu_bl) {
if (sleep) {
struct adb_request req;
@@ -166,6 +166,7 @@ void __init pmu_backlight_init()
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);