fbcon: logo: disable logo at boot

Add logo.nologo kernel boot option to disable the logo in order to provide
more screen space for kernel messages; especially useful when debugging and
screen space is more critical.

newport_con driver changes are untested.

[akpm@linux-foundation.org: cleanups, coding-style fixes]
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
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, 14 insertions, 6 deletions

diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c
index dda0586ab3f3..f57d7b2758b7 100644
--- a/drivers/video/console/newport_con.c
+++ b/drivers/video/console/newport_con.c
@@ -98,14 +98,19 @@ static inline void newport_init_cmap(void)
         }
 }
 
-static void newport_show_logo(void)
+static struct linux_logo *newport_show_logo(void)
 {
 #ifdef CONFIG_LOGO_SGI_CLUT224
         const struct linux_logo *logo = fb_find_logo(8);
-        const unsigned char *clut = logo->clut;
-        const unsigned char *data = logo->data;
+        const unsigned char *clut;
+        const unsigned char *data;
         unsigned long i;
 
+        if (!logo)
+                return NULL;
+        *clut = logo->clut;
+        *data = logo->data;
+
         for (i = 0; i < logo->clutsize; i++) {
                 newport_bfwait(npregs);
                 newport_cmap_setaddr(npregs, i + 0x20);
@@ -123,6 +128,8 @@ static void newport_show_logo(void)
 
         for (i = 0; i < logo->width*logo->height; i++)
                 npregs->go.hostrw0 = *data++ << 24;
+
+        return logo;
 #endif /* CONFIG_LOGO_SGI_CLUT224 */
 }
 
@@ -465,9 +472,10 @@ static int newport_switch(struct vc_data *vc)
         npregs->cset.topscan = 0x3ff;
 
         if (!logo_drawn) {
-                newport_show_logo();
-                logo_drawn = 1;
-                logo_active = 1;
+                if (newport_show_logo()) {
+                        logo_drawn = 1;
+                        logo_active = 1;
+                }
         }
 
         return 1;