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: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 26 insertions, 16 deletions

diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 215ac579f901..074027204702 100644
--- a/drivers/video/fbmem.c
+++ b/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);
 }