vga16fb: restrict to blit rectangles with widths of multiples of 8 pixels

Advertise that vga16fb can only handle widths that are 8-pixel-multiple only
(software limitation). To ensure that a legal font is available, SELECT an
8x16 font in Kconfig.

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>

2 files changed, 3 insertions, 0 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 75ec7d155da9..51c4b25dad25 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -519,6 +519,7 @@ config FB_VGA16
         select FB_CFB_COPYAREA
         select FB_CFB_IMAGEBLIT
         select VGASTATE
+        select FONT_8x16 if FRAMEBUFFER_CONSOLE
         help
           This is the frame buffer device driver for VGA 16 color graphic
           cards. Say Y if you have such a card.
diff --git a/drivers/video/vga16fb.c b/drivers/video/vga16fb.c
index ec4c7dc54a66..6c580a02b829 100644
--- a/drivers/video/vga16fb.c
+++ b/drivers/video/vga16fb.c
@@ -1378,6 +1378,8 @@ static int __init vga16fb_probe(struct platform_device *dev)
         info->fbops = &vga16fb_ops;
         info->var = vga16fb_defined;
         info->fix = vga16fb_fix;
+        /* supports 8-pixel wide blit rectangles only */
+        info->pixmap.blit_x = 1 << (8 - 1);
         info->flags = FBINFO_FLAG_DEFAULT |
                 FBINFO_HWACCEL_YPAN;