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>

3 files changed, 29 insertions, 3 deletions

diff --git a/drivers/video/aty/aty128fb.c b/drivers/video/aty/aty128fb.c
index 8726c3669713..e86d7e0c9825 100644
--- a/drivers/video/aty/aty128fb.c
+++ b/drivers/video/aty/aty128fb.c
@@ -357,6 +357,12 @@ static int default_lcd_on __devinitdata = 1;
 static int mtrr = 1;
 #endif
 
+#ifdef CONFIG_PMAC_BACKLIGHT
+static int backlight __devinitdata = 1;
+#else
+static int backlight __devinitdata = 0;
+#endif
+
 /* PLL constants */
 struct aty128_constants {
         u32 ref_clk;
@@ -1652,6 +1658,9 @@ static int __devinit aty128fb_setup(char *options)
                 } else if (!strncmp(this_opt, "crt:", 4)) {
                         default_crt_on = simple_strtoul(this_opt+4, NULL, 0);
                         continue;
+                } else if (!strncmp(this_opt, "backlight:", 10)) {
+                        backlight = simple_strtoul(this_opt+10, NULL, 0);
+                        continue;
                 }
 #ifdef CONFIG_MTRR
                 if(!strncmp(this_opt, "nomtrr", 6)) {
@@ -1985,7 +1994,8 @@ static int __devinit aty128_init(struct pci_dev *pdev, const struct pci_device_i
         par->lock_blank = 0;
 
 #ifdef CONFIG_FB_ATY128_BACKLIGHT
-        aty128_bl_init(par);
+        if (backlight)
+                aty128_bl_init(par);
 #endif
 
         if (register_framebuffer(info) < 0)
diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index a7e0062233f2..00a51835fd82 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -308,6 +308,12 @@ static int xclk;
 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 @@ static int __devinit aty_init(struct fb_info *info)
                            | (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 @@ static int __init atyfb_setup(char *options)
                         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 =
diff --git a/drivers/video/aty/radeon_base.c b/drivers/video/aty/radeon_base.c
index 46ba1235f03a..1bf6f42eb400 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;