diff options
| author | David S. Miller <davem@davemloft.net> | 2007-03-08 08:17:20 +0100 |
|---|---|---|
| committer | Adrian Bunk <bunk@stusta.de> | 2007-03-08 08:17:20 +0100 |
| commit | 2d3bc628ad9b9c883f94a2d5a9ad48b0a95101a3 (patch) | |
| tree | 045cdc817322e6b890815842ed27c78420293dee /drivers | |
| parent | 1a6b8d666d090d821cbc9c07d788ac85639d74c8 (diff) | |
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: Adrian Bunk <bunk@stusta.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/aty/mach64_ct.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/video/aty/mach64_ct.c b/drivers/video/aty/mach64_ct.c index e7056934c6a..11c7bbc9e84 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); |