From 2d3bc628ad9b9c883f94a2d5a9ad48b0a95101a3 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Thu, 8 Mar 2007 08:17:20 +0100 Subject: video/aty/mach64_ct.c: fix bogus delay loop CT based mach64 cards were reported to hang on sparc64 boxes when compiled with gcc-4.1.x and later. Looking at this piece of code, it's no surprise. A critical delay was implemented as an empty for() loop, and gcc 4.0.x and previous did not optimize it away, so we did get a delay. But gcc-4.1.x and later can optimize it away, and we get crashes. Use a real udelay() to fix this. Fix verified on SunBlade100. Signed-off-by: David S. Miller Signed-off-by: Adrian Bunk --- drivers/video/aty/mach64_ct.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/video/aty/mach64_ct.c b/drivers/video/aty/mach64_ct.c index e7056934c6a8..11c7bbc9e84a 100644 --- a/drivers/video/aty/mach64_ct.c +++ b/drivers/video/aty/mach64_ct.c @@ -399,7 +399,7 @@ static int __init aty_init_pll_ct(const struct fb_info *info, { struct atyfb_par *par = (struct atyfb_par *) info->par; u8 mpost_div, xpost_div, sclk_post_div_real, sclk_fb_div, spll_cntl2; - u32 q, i, memcntl, trp; + u32 q, memcntl, trp; u32 dsp_config, dsp_on_off, vga_dsp_config, vga_dsp_on_off; #ifdef DEBUG int pllmclk, pllsclk; @@ -598,7 +598,7 @@ static int __init aty_init_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++); + udelay(500); } aty_st_pll_ct(PLL_REF_DIV, pll->ct.pll_ref_div, par); -- cgit v1.2.3