fbdev: fbmem: add config option to center the bootup logo

If there are extra logos (CONFIG_FB_LOGO_EXTRA) the heights of these
extra logos are not considered when centering the first logo vertically.
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

drivers/video/fbdev/core/fbmem.c

@@ -506,8 +506,25 @@ static int fb_show_logo_line(struct fb_info *info, int rotate,
 		fb_set_logo(info, logo, logo_new, fb_logo.depth);
 	}
 
+#ifdef CONFIG_FB_LOGO_CENTER
+	{
+		int xres = info->var.xres;
+		int yres = info->var.yres;
+
+		if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) {
+			xres = info->var.yres;
+			yres = info->var.xres;
+		}
+
+		while (n && (n * (logo->width + 8) - 8 > xres))
+			--n;
+		image.dx = (xres - n * (logo->width + 8) - 8) / 2;
+		image.dy = y ?: (yres - logo->height) / 2;
+	}
+#else
 	image.dx = 0;
 	image.dy = y;
+#endif
 	image.width = logo->width;
 	image.height = logo->height;
 
@@ -604,6 +621,7 @@ int fb_prepare_logo(struct fb_info *info, int rotate)
 {
 	int depth = fb_get_color_depth(&info->var, &info->fix);
 	unsigned int yres;
+	int height;
 
 	memset(&fb_logo, 0, sizeof(struct logo_data));
 
@@ -665,7 +683,12 @@ int fb_prepare_logo(struct fb_info *info, int rotate)
  		}
  	}
 
-	return fb_prepare_extra_logos(info, fb_logo.logo->height, yres);
+	height = fb_logo.logo->height;
+#ifdef CONFIG_FB_LOGO_CENTER
+	height += (yres - fb_logo.logo->height) / 2;
+#endif
+
+	return fb_prepare_extra_logos(info, height, yres);
 }
 
 int fb_show_logo(struct fb_info *info, int rotate)

drivers/video/logo/Kconfig

@@ -10,6 +10,15 @@ menuconfig LOGO
 
 if LOGO
 
+config FB_LOGO_CENTER
+	bool "Center the logo"
+	depends on FB=y
+	help
+	  When this option is selected, the bootup logo is centered both
+	  horizontally and vertically. If more than one logo is displayed
+	  due to multiple CPUs, the collected line of logos is centered
+	  as a whole.
+
 config FB_LOGO_EXTRA
 	bool
 	depends on FB=y