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Commit deea62d3 authored by Krzysztof Helt's avatar Krzysztof Helt Committed by Linus Torvalds
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pm3fb: 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 6416ad73

drivers/video/pm3fb.c

+4 −3
Original line number Diff line number Diff line
@@ -110,7 +110,8 @@ static inline void PM3_WRITE_REG(struct pm3_par *par, s32 off, u32 v) 


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 *info) 
	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;