backlight: Allow enable/disable of fb backlights, fixing regressions
Enabling the backlight by default appears to cause problems for many
users. This patch disables backlight controls unless explicitly
enabled by users via a module parameter. Since PMAC users are known
to work, default to enabled in that case.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index a7e0062..00a5183 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -308,6 +308,12 @@
static int comp_sync __devinitdata = -1;
static char *mode;
+#ifdef CONFIG_PMAC_BACKLIGHT
+static int backlight __devinitdata = 1;
+#else
+static int backlight __devinitdata = 0;
+#endif
+
#ifdef CONFIG_PPC
static int default_vmode __devinitdata = VMODE_CHOOSE;
static int default_cmode __devinitdata = CMODE_CHOOSE;
@@ -2575,7 +2581,7 @@
| (USE_F32KHZ | TRISTATE_MEM_EN), par);
} else
#endif
- if (M64_HAS(MOBIL_BUS)) {
+ if (M64_HAS(MOBIL_BUS) && backlight) {
#ifdef CONFIG_FB_ATY_BACKLIGHT
aty_bl_init (par);
#endif
@@ -3757,6 +3763,8 @@
xclk = simple_strtoul(this_opt+5, NULL, 0);
else if (!strncmp(this_opt, "comp_sync:", 10))
comp_sync = simple_strtoul(this_opt+10, NULL, 0);
+ else if (!strncmp(this_opt, "backlight:", 10))
+ backlight = simple_strtoul(this_opt+10, NULL, 0);
#ifdef CONFIG_PPC
else if (!strncmp(this_opt, "vmode:", 6)) {
unsigned int vmode =