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authorDavid Miller <davem@davemloft.net>2007-03-05 04:35:36 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-05 11:12:54 -0500
commit8690ba446defe2e2b81803756c099d2943dfd5fd (patch)
treec7df0f8765ffeeb192ae2a338427c4158100d77d /drivers/video
parent8f485612231792373580e8b2fe8ceb3791549aa5 (diff)
[PATCH] 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 <davem@davemloft.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/aty/mach64_ct.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/video/aty/mach64_ct.c b/drivers/video/aty/mach64_ct.c
index f3b487b8710b..1fdcfdbf669b 100644
--- a/drivers/video/aty/mach64_ct.c
+++ b/drivers/video/aty/mach64_ct.c
@@ -598,7 +598,6 @@ static void aty_resume_pll_ct(const struct fb_info *info,
598 struct atyfb_par *par = info->par; 598 struct atyfb_par *par = info->par;
599 599
600 if (par->mclk_per != par->xclk_per) { 600 if (par->mclk_per != par->xclk_per) {
601 int i;
602 /* 601 /*
603 * This disables the sclk, crashes the computer as reported: 602 * This disables the sclk, crashes the computer as reported:
604 * aty_st_pll_ct(SPLL_CNTL2, 3, info); 603 * aty_st_pll_ct(SPLL_CNTL2, 3, info);
@@ -614,7 +613,7 @@ static void aty_resume_pll_ct(const struct fb_info *info,
614 * helps for Rage Mobilities that sometimes crash when 613 * helps for Rage Mobilities that sometimes crash when
615 * we switch to sclk. (Daniel Mantione, 13-05-2003) 614 * we switch to sclk. (Daniel Mantione, 13-05-2003)
616 */ 615 */
617 for (i=0;i<=0x1ffff;i++); 616 udelay(500);
618 } 617 }
619 618
620 aty_st_pll_ct(PLL_REF_DIV, pll->ct.pll_ref_div, par); 619 aty_st_pll_ct(PLL_REF_DIV, pll->ct.pll_ref_div, par);