diff options
| author | Krzysztof Helt <krzysztof.h1@wp.pl> | 2007-10-16 01:29:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:43:19 -0700 |
| commit | deea62d3796da4c53614638ced8d9784dd5b8b41 (patch) | |
| tree | 744bf19f0571652ab2464b7b52e59fc50439a12e /drivers/video/pm3fb.c | |
| parent | 6416ad7365833657fe0ca561261b324edc5aba42 (diff) | |
| download | lwn-deea62d3796da4c53614638ced8d9784dd5b8b41.tar.gz lwn-deea62d3796da4c53614638ced8d9784dd5b8b41.zip | |
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>
Diffstat (limited to 'drivers/video/pm3fb.c')
| -rw-r--r-- | drivers/video/pm3fb.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/video/pm3fb.c b/drivers/video/pm3fb.c index 6a64b934133a..070659992c18 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; |