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pm3fb: replace busy waiting with cpu_relax

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This patch replaces busy waiting with the cpu_relax() call.  This makes
scrolling faster.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Helt 2007-10-16 01:29:27 -07:00 committed by Linus Torvalds
parent 6416ad7365
commit deea62d379
1 changed files with 4 additions and 3 deletions
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7
drivers/video/pm3fb.c
View file

@ -110,7 +110,8 @@ static inline void PM3_WRITE_REG(struct pm3_par *par, s32 off, u32 v)
static inline void PM3_WAIT(struct pm3_par *par, u32 n)
{
while (PM3_READ_REG(par, PM3InFIFOSpace) < n);
while (PM3_READ_REG(par, PM3InFIFOSpace) < n)
cpu_relax();
}
static inline void PM3_WRITE_DAC_REG(struct pm3_par *par, unsigned r, u8 v)
@ -209,8 +210,8 @@ static int pm3fb_sync(struct fb_info *info)
PM3_WRITE_REG(par, PM3Sync, 0);
mb();
do {
while ((PM3_READ_REG(par, PM3OutFIFOWords)) == 0);
rmb();
while ((PM3_READ_REG(par, PM3OutFIFOWords)) == 0)
cpu_relax();
} while ((PM3_READ_REG(par, PM3OutputFifo)) != PM3Sync_Tag);
return 0;