* [PATCH 11/12] pm3fb: replace busy waiting with cpu_relax
@ 2007-09-15 0:07 Antonino A. Daplas
0 siblings, 0 replies; only message in thread
From: Antonino A. Daplas @ 2007-09-15 0:07 UTC (permalink / raw)
To: Andrew Morton; +Cc: Krzysztof Helt, Linux Fbdev development list
From: Krzysztof Helt <krzysztof.h1@wp.pl>
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>
---
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 6a64b93..0706599 100644
--- a/drivers/video/pm3fb.c
+++ b/drivers/video/pm3fb.c
@@ -110,7 +110,8 @@ static inline void PM3_WRITE_REG(struct
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 *in
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;
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