Anyone with a SunBlade100 or SunBlade150 trying to use
kernels built with gcc-4.1.x or later and seeing hangs
should try out this patch.
GCC-4.1.x and later optimize away this poorly constructed
delay, so there is no delay, and the chip hangs.
I'll put a proper version of this fix, using a udelay(),
upstream very soon.
Thanks.
diff --git a/drivers/video/aty/mach64_ct.c b/drivers/video/aty/mach64_ct.c
index f3b487b..96e91ee 100644
--- a/drivers/video/aty/mach64_ct.c
+++ b/drivers/video/aty/mach64_ct.c
@@ -614,7 +614,8 @@ static void aty_resume_pll_ct(const struct fb_info *info,
* helps for Rage Mobilities that sometimes crash when
* we switch to sclk. (Daniel Mantione, 13-05-2003)
*/
- for (i=0;i<=0x1ffff;i++);
+ for (i=0;i<=0x1ffff;i++)
+ barrier();
}
aty_st_pll_ct(PLL_REF_DIV, pll->ct.pll_ref_div, par);
-
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