[PATCH] nvidiafb: Add boot option 'bpp'

Add boot/module option 'bpp' so user can specify at what color depth to boot
into.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 21 insertions, 4 deletions

diff --git a/drivers/video/nvidia/nvidia.c b/drivers/video/nvidia/nvidia.c
index 099d64af37be..ae6f2ff70abf 100644
--- a/drivers/video/nvidia/nvidia.c
+++ b/drivers/video/nvidia/nvidia.c
@@ -428,6 +428,7 @@ static int noaccel __devinitdata = 0;
 static int noscale __devinitdata = 0;
 static int paneltweak __devinitdata = 0;
 static int vram __devinitdata = 0;
+static int bpp __devinitdata = 8;
 #ifdef CONFIG_MTRR
 static int nomtrr __devinitdata = 0;
 #endif
@@ -1392,24 +1393,36 @@ static int __devinit nvidia_set_fbinfo(struct fb_info *info)
                                  info->monspecs.modedb_len, &info->modelist);
         fb_var_to_videomode(&modedb, &nvidiafb_default_var);
 
+        switch (bpp) {
+        case 0 ... 8:
+                bpp = 8;
+                break;
+        case 9 ... 16:
+                bpp = 16;
+                break;
+        default:
+                bpp = 32;
+                break;
+        }
+
         if (specs->modedb != NULL) {
                 struct fb_videomode *modedb;
 
                 modedb = fb_find_best_display(specs, &info->modelist);
                 fb_videomode_to_var(&nvidiafb_default_var, modedb);
-                nvidiafb_default_var.bits_per_pixel = 8;
+                nvidiafb_default_var.bits_per_pixel = bpp;
         } else if (par->fpWidth && par->fpHeight) {
                 char buf[16];
 
                 memset(buf, 0, 16);
                 snprintf(buf, 15, "%dx%dMR", par->fpWidth, par->fpHeight);
                 fb_find_mode(&nvidiafb_default_var, info, buf, specs->modedb,
-                             specs->modedb_len, &modedb, 8);
+                             specs->modedb_len, &modedb, bpp);
         }
 
         if (mode_option)
                 fb_find_mode(&nvidiafb_default_var, info, mode_option,
-                             specs->modedb, specs->modedb_len, &modedb, 8);
+                             specs->modedb, specs->modedb_len, &modedb, bpp);
 
         info->var = nvidiafb_default_var;
         info->fix.visual = (info->var.bits_per_pixel == 8) ?
@@ -1769,6 +1782,8 @@ static int __devinit nvidiafb_setup(char *options)
 #endif
                 } else if (!strncmp(this_opt, "fpdither:", 9)) {
                         fpdither = simple_strtol(this_opt+9, NULL, 0);
+                } else if (!strncmp(this_opt, "bpp:", 4)) {
+                        bpp = simple_strtoul(this_opt+4, NULL, 0);
                 } else
                         mode_option = this_opt;
         }
@@ -1846,7 +1861,9 @@ MODULE_PARM_DESC(vram,
                  "(default=0 - remap entire memory)");
 module_param(mode_option, charp, 0);
 MODULE_PARM_DESC(mode_option, "Specify initial video mode");
-
+module_param(bpp, int, 0);
+MODULE_PARM_DESC(bpp, "pixel width in bits"
+                 "(default=8)");
 #ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
 MODULE_PARM_DESC(nomtrr, "Disables MTRR support (0 or 1=disabled) "