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.

---

 drivers/video/Kconfig   |    1 +
 drivers/video/vga16fb.c |    2 ++
 2 files changed, 3 insertions(+), 0 deletions(-)

index 61931da..e440caf 100644
@@ -516,6 +516,7 @@ 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.

index ec4c7dc..6c580a0 100644
@@ -1378,6 +1378,8 @@ static int __init vga16fb_probe(struct p
 	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;
 

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