[PATCH 11/12] pm3fb: replace busy waiting with cpu_relax
DORMANTno replies
From: "Antonino A. Daplas" <adaplas@gmail.com>
Date: 2007-09-15 00:10:33
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
From: Krzysztof Helt <redacted> This patch replaces busy waiting with the cpu_relax() call. This makes scrolling faster. Signed-off-by: Krzysztof Helt <redacted> 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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