Commit bf26ad72 authored by Antonino A. Daplas's avatar Antonino A. Daplas Committed by Linus Torvalds

fbdev: advertise limitation of drawing engine

A few drivers are not capable of blitting rectangles of any dimension.
vga16fb can only blit 8-pixel wide rectangles, while s3fb (in tileblitting
mode) can only blit 8x16 rectangles.  For example, loading a 12x22 font in
vga16fb will result in a corrupt display.

Advertise this limitation/capability in info->pixmap.blit_x and blit_y.  These
fields are 32-bit arrays (font max is 32x32 only), ie, if bit 7 is set, then
width/height of 7+1 is supported.
Signed-off-by: default avatarAntonino Daplas <adaplas@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent dc0e6e05
...@@ -1321,6 +1321,12 @@ register_framebuffer(struct fb_info *fb_info) ...@@ -1321,6 +1321,12 @@ register_framebuffer(struct fb_info *fb_info)
} }
fb_info->pixmap.offset = 0; fb_info->pixmap.offset = 0;
if (!fb_info->pixmap.blit_x)
fb_info->pixmap.blit_x = ~(u32)0;
if (!fb_info->pixmap.blit_y)
fb_info->pixmap.blit_y = ~(u32)0;
if (!fb_info->modelist.prev || !fb_info->modelist.next) if (!fb_info->modelist.prev || !fb_info->modelist.next)
INIT_LIST_HEAD(&fb_info->modelist); INIT_LIST_HEAD(&fb_info->modelist);
......
...@@ -558,6 +558,10 @@ struct fb_pixmap { ...@@ -558,6 +558,10 @@ struct fb_pixmap {
u32 scan_align; /* alignment per scanline */ u32 scan_align; /* alignment per scanline */
u32 access_align; /* alignment per read/write (bits) */ u32 access_align; /* alignment per read/write (bits) */
u32 flags; /* see FB_PIXMAP_* */ u32 flags; /* see FB_PIXMAP_* */
u32 blit_x; /* supported bit block dimensions (1-32)*/
u32 blit_y; /* Format: blit_x = 1 << (width - 1) */
/* blit_y = 1 << (height - 1) */
/* if 0, will be set to 0xffffffff (all)*/
/* access methods */ /* access methods */
void (*writeio)(struct fb_info *info, void __iomem *dst, void *src, unsigned int size); void (*writeio)(struct fb_info *info, void __iomem *dst, void *src, unsigned int size);
void (*readio) (struct fb_info *info, void *dst, void __iomem *src, unsigned int size); void (*readio) (struct fb_info *info, void *dst, void __iomem *src, unsigned int size);
......
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