pm2fb: 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>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/video/pm2fb.c b/drivers/video/pm2fb.c
index 9db1f2e1dadf..5591dfb22b18 100644
--- a/drivers/video/pm2fb.c
+++ b/drivers/video/pm2fb.c
@@ -193,8 +193,8 @@ static inline void pm2v_RDAC_WR(struct pm2fb_par *p, s32 idx, u32 v)
 #else
 static inline void WAIT_FIFO(struct pm2fb_par *p, u32 a)
 {
-        while (pm2_RD(p, PM2R_IN_FIFO_SPACE) < a);
-        mb();
+        while (pm2_RD(p, PM2R_IN_FIFO_SPACE) < a)
+                cpu_relax();
 }
 #endif
 
@@ -328,7 +328,7 @@ static void reset_card(struct pm2fb_par *p)
         pm2_WR(p, PM2R_RESET_STATUS, 0);
         mb();
         while (pm2_RD(p, PM2R_RESET_STATUS) & PM2F_BEING_RESET)
-                ;
+                cpu_relax();
         mb();
 #ifdef CONFIG_FB_PM2_FIFO_DISCONNECT
         DPRINTK("FIFO disconnect enabled\n");
@@ -1041,8 +1041,7 @@ static int pm2fb_sync(struct fb_info *info)
         mb();
         do {
                 while (pm2_RD(par, PM2R_OUT_FIFO_WORDS) == 0)
-                        udelay(10);
-                rmb();
+                        cpu_relax();
         } while (pm2_RD(par, PM2R_OUT_FIFO) != PM2TAG(PM2R_SYNC));
 
         return 0;