diff options
| author | Krzysztof Helt <krzysztof.h1@wp.pl> | 2008-07-23 21:31:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-24 10:47:36 -0700 |
| commit | f330c4b1961d730ef15ac184e4b7f1c25847d0ae (patch) | |
| tree | 4751dc03a194a3b8471d8e8a3af41762959d04ff /drivers/video/tridentfb.c | |
| parent | a4af1798d768ab2f12ab623e21ad68dc8c248005 (diff) | |
tridentfb: y-panning fixes
The Trident cards uses only 20-bit address of screen start in double
words. This allows addressing for only 4MB of video memory so check this.
Also remove some redundant checks and assignments.
Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/tridentfb.c')
| -rw-r--r-- | drivers/video/tridentfb.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/video/tridentfb.c b/drivers/video/tridentfb.c index 1c3f0ba4b33a..138140bdb495 100644 --- a/drivers/video/tridentfb.c +++ b/drivers/video/tridentfb.c @@ -870,8 +870,10 @@ static int tridentfb_check_var(struct fb_var_screeninfo *var, line_length = var->xres_virtual * bpp / 8; } - if (var->yres > var->yres_virtual) - var->yres_virtual = var->yres; + /* datasheet specifies how to set panning only up to 4 MB */ + if (line_length * (var->yres_virtual - var->yres) > (4 << 20)) + var->yres_virtual = ((4 << 20) / line_length) + var->yres; + if (line_length * var->yres_virtual > info->fix.smem_len) return -EINVAL; @@ -944,8 +946,6 @@ static int tridentfb_pan_display(struct fb_var_screeninfo *var, debug("enter\n"); offset = (var->xoffset + (var->yoffset * var->xres_virtual)) * var->bits_per_pixel / 32; - info->var.xoffset = var->xoffset; - info->var.yoffset = var->yoffset; set_screen_start(par, offset); debug("exit\n"); return 0; @@ -1225,7 +1225,6 @@ static int tridentfb_setcolreg(unsigned regno, unsigned red, unsigned green, ((blue & 0xFF00) >> 8); } -/* debug("exit\n"); */ return 0; } |