commit deea62d3796da4c53614638ced8d9784dd5b8b41
author Krzysztof Helt <krzysztof.h1@wp.pl> Tue Oct 16 01:29:27 2007 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> Tue Oct 16 09:43:19 2007 -0700
tree 744bf19f0571652ab2464b7b52e59fc50439a12e
parent 6416ad7365833657fe0ca561261b324edc5aba42

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>

drivers/video/pm3fb.c

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_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 @@
 	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;