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>

diff --git a/drivers/video/backlight/corgi_lcd.c b/drivers/video/backlight/corgi_lcd.c
index 2211a85..9677494 100644 (file)
--- 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);
 }