From cd818a381ddcdc2440a167757394298f28b70240 Mon Sep 17 00:00:00 2001 From: Nobuhiro Iwamatsu Date: Tue, 4 Nov 2014 13:28:50 +0900 Subject: i2c: rcar_i2c: Fix order of restart and clear status In case of repeated START condition, the restart has to be kicked before clear status (MSR register). If it is kicked after clear status, R-Car I2C may transfer data (TXD register) or receive data (RXD register) instead of transferring slave address (MAR register). Signed-off-by: Ryo Kataoka Signed-off-by: Nobuhiro Iwamatsu --- drivers/i2c/rcar_i2c.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/rcar_i2c.c b/drivers/i2c/rcar_i2c.c index 50cebd6..90ad116 100644 --- a/drivers/i2c/rcar_i2c.c +++ b/drivers/i2c/rcar_i2c.c @@ -119,10 +119,10 @@ rcar_i2c_raw_read(struct rcar_i2c *dev, u8 chip, uint addr) /* set slave address, receive */ writel((chip << 1) | 1, &dev->icmar); - /* clear status */ - writel(0, &dev->icmsr); /* start master receive */ writel(MCR_MDBS | MCR_MIE | MCR_ESG, &dev->icmcr); + /* clear status */ + writel(0, &dev->icmsr); while ((readl(&dev->icmsr) & (MSR_MAT | MSR_MDR)) != (MSR_MAT | MSR_MDR)) -- cgit v1.1