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radeonfb: Disable new color expand acceleration unless explicitely enabled

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This new color expansion acceleration for radeonfb appears to trigger
problems with X on VT switch and suspend/resume on some machines. It
might be a problem in the VT layer or in X, but I haven't quite found
it yet, so in the meantime, this disables the acceleration by default,
reverting to 2.6.27 state. It can be enabled using the "accel_cexp"
module parameter or fbdev argument.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Benjamin Herrenschmidt
2008-12-09 15:54:18 +11:00
committed by Linus Torvalds
parent f7a8db89c1
commit f3179748a1
3 changed files with 10 additions and 1 deletions
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3
drivers/video/aty/radeon_accel.c
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@@ -256,7 +256,8 @@ void radeonfb_imageblit(struct fb_info *info, const struct fb_image *image)
return;
/* We only do 1 bpp color expansion for now */
if (info->flags & FBINFO_HWACCEL_DISABLED || image->depth != 1)
if (!accel_cexp ||
(info->flags & FBINFO_HWACCEL_DISABLED) || image->depth != 1)
goto fallback;
/* Fallback if running out of the screen. We may do clipping