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[PATCH] savagefb: X-panning fixes 

The driver unconditionally sets xpanstep to 2.  However, a value of 4
empirically works better at bpp = 8, and 2 for 16 and 32.  This buglet was
exposed by the rotation code.

Second fix is the unconditional call to update_start() without verifying if
the offsets are correct.  Remove this call, it's not necessary and secondly,
it causes a crash with invalid values.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Antonino A. Daplas 2005-11-08 21:39:05 -08:00 committed by Linus Torvalds
parent 64c7c8f885
commit 6d83b0bb8e
1 changed files with 6 additions and 4 deletions
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10
drivers/video/savage/savagefb_driver.c
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@ -1315,10 +1315,14 @@ static void savagefb_set_fix(struct fb_info *info)
info->fix.line_length = info->var.xres_virtual *
info->var.bits_per_pixel / 8;
if (info->var.bits_per_pixel == 8)
if (info->var.bits_per_pixel == 8) {
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
else
info->fix.xpanstep = 4;
} else {
info->fix.visual = FB_VISUAL_TRUECOLOR;
info->fix.xpanstep = 2;
}
}
#if defined(CONFIG_FB_SAVAGE_ACCEL)
@ -1363,7 +1367,6 @@ static int savagefb_set_par (struct fb_info *info)
par->minClock = 10000;
savagefb_set_par_int (par);
savagefb_update_start (par, var);
fb_set_cmap (&info->cmap, info);
savagefb_set_fix(info);
savagefb_set_clip(info);
@ -1873,7 +1876,6 @@ static int __devinit savage_init_fb_info (struct fb_info *info,
info->fix.type = FB_TYPE_PACKED_PIXELS;
info->fix.type_aux = 0;
info->fix.xpanstep = 2;
info->fix.ypanstep = 1;
info->fix.ywrapstep = 0;
info->fix.accel = id->driver_data;