i2c: i2c-s3c2410: Add a cpu_relax() to busy wait for bus idle

Be a bit more friendly.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 2754cef..37b2de1 100644 (file)
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -534,6 +534,7 @@ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c,
 
        /* first, try busy waiting briefly */
        do {
 
        /* first, try busy waiting briefly */
        do {

+               cpu_relax();

                iicstat = readl(i2c->regs + S3C2410_IICSTAT);
        } while ((iicstat & S3C2410_IICSTAT_START) && --spins);
 
                iicstat = readl(i2c->regs + S3C2410_IICSTAT);
        } while ((iicstat & S3C2410_IICSTAT_START) && --spins);