fbdev: Fix logo if logo depth is less than framebuffer depth

The VGA16 logo (bpp = 4) and monochrome logo (bpp = 1) do not contain any
color information (no CLUT).  If the fb depth is > logo depth, these logo's
will not properly display. Fix by using the console palette instead of
creating a new one.
Signed-off-by: NAntonino Daplas <adaplas@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/fbmem.c

@@ -244,8 +244,17 @@ static void fb_set_logo(struct fb_info *info,
 	u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0;
 	u8 fg = 1, d;
 
-	if (fb_get_color_depth(&info->var, &info->fix) == 3)
+	switch (fb_get_color_depth(&info->var, &info->fix)) {
+	case 1:
+		fg = 1;
+		break;
+	case 2:
+		fg = 3;
+		break;
+	default:
 		fg = 7;
+		break;
+	}
 
 	if (info->fix.visual == FB_VISUAL_MONO01 ||
 	    info->fix.visual == FB_VISUAL_MONO10)
@@ -564,21 +573,6 @@ int fb_prepare_logo(struct fb_info *info, int rotate)
 		depth = 4;
 	}
 
-	if (depth >= 8) {
-		switch (info->fix.visual) {
-		case FB_VISUAL_TRUECOLOR:
-			fb_logo.needs_truepalette = 1;
-			break;
-		case FB_VISUAL_DIRECTCOLOR:
-			fb_logo.needs_directpalette = 1;
-			fb_logo.needs_cmapreset = 1;
-			break;
-		case FB_VISUAL_PSEUDOCOLOR:
-			fb_logo.needs_cmapreset = 1;
-			break;
-		}
-	}
-
 	/* Return if no suitable logo was found */
 	fb_logo.logo = fb_find_logo(depth);
 
@@ -604,6 +598,22 @@ int fb_prepare_logo(struct fb_info *info, int rotate)
 	else
 		fb_logo.depth = 1;
 
+
+ 	if (fb_logo.depth > 4 && depth > 4) {
+ 		switch (info->fix.visual) {
+ 		case FB_VISUAL_TRUECOLOR:
+ 			fb_logo.needs_truepalette = 1;
+ 			break;
+ 		case FB_VISUAL_DIRECTCOLOR:
+ 			fb_logo.needs_directpalette = 1;
+ 			fb_logo.needs_cmapreset = 1;
+ 			break;
+ 		case FB_VISUAL_PSEUDOCOLOR:
+ 			fb_logo.needs_cmapreset = 1;
+ 			break;
+ 		}
+ 	}
+
 	return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
 }