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authorKrzysztof Helt <krzysztof.h1@wp.pl>2007-10-16 01:29:27 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:19 -0700
commitdeea62d3796da4c53614638ced8d9784dd5b8b41 (patch)
tree744bf19f0571652ab2464b7b52e59fc50439a12e
parent6416ad7365833657fe0ca561261b324edc5aba42 (diff)
pm3fb: replace busy waiting with cpu_relax
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>
-rw-r--r--drivers/video/pm3fb.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/video/pm3fb.c b/drivers/video/pm3fb.c
index 6a64b934133..070659992c1 100644
--- a/drivers/video/pm3fb.c
+++ b/drivers/video/pm3fb.c
@@ -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;