backlight: Fix backlight limiting on spitz/corgi devices

On spitz (& similar) machines, if battery is running low, backlight
needs
to be limited to lower step.  Unfortunately, current code uses &= for
limiting, turning backlight off completely for some backlight settings.
Fix that.

Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
index 2211a852af9c..96774949cd30 100644
--- a/drivers/video/backlight/corgi_lcd.c
+++ b/drivers/video/backlight/corgi_lcd.c
@@ -433,8 +433,9 @@ static int corgi_bl_update_status(struct backlight_device *bd)
 
         if (corgibl_flags & CORGIBL_SUSPENDED)
                 intensity = 0;
-        if (corgibl_flags & CORGIBL_BATTLOW)
-                intensity &= lcd->limit_mask;
+
+        if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask)
+                intensity = lcd->limit_mask;
 
         return corgi_bl_set_intensity(lcd, intensity);
 }