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Commit 6416ad73 authored by Krzysztof Helt's avatar Krzysztof Helt Committed by Linus Torvalds
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pm2fb: replace busy waiting with cpu_relax 



This patch replaces busy waiting with the cpu_relax() call.  This makes
scrolling faster.

Signed-off-by: default avatarKrzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: default avatarAntonino Daplas <adaplas@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f67fd7c1

drivers/video/pm2fb.c

+4 −5
Original line number Diff line number Diff line
@@ -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;