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>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/video/aty/radeon_base.c b/drivers/video/aty/radeon_base.c
index 46ba1235f03..1bf6f42eb40 100644
--- a/drivers/video/aty/radeon_base.c
+++ b/drivers/video/aty/radeon_base.c
@@ -268,6 +268,11 @@ static int nomtrr = 0;
 #endif
 static int force_sleep;
 static int ignore_devlist;
+#ifdef CONFIG_PMAC_BACKLIGHT
+static int backlight = 1;
+#else
+static int backlight = 0;
+#endif
 
 /*
  * prototypes
@@ -2348,7 +2353,8 @@ static int __devinit radeonfb_pci_register (struct pci_dev *pdev,
                                                  MTRR_TYPE_WRCOMB, 1);
 #endif
 
-        radeonfb_bl_init(rinfo);
+        if (backlight)
+                radeonfb_bl_init(rinfo);
 
         printk ("radeonfb (%s): %s\n", pci_name(rinfo->pdev), rinfo->name);
 
@@ -2469,6 +2475,8 @@ static int __init radeonfb_setup (char *options)
                         force_dfp = 1;
                 } else if (!strncmp(this_opt, "panel_yres:", 11)) {
                         panel_yres = simple_strtoul((this_opt+11), NULL, 0);
+                } else if (!strncmp(this_opt, "backlight:", 10)) {
+                        backlight = simple_strtoul(this_opt+10, NULL, 0);
 #ifdef CONFIG_MTRR
                 } else if (!strncmp(this_opt, "nomtrr", 6)) {
                         nomtrr = 1;