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 ryo.kataoka.wt@renesas.com Signed-off-by: Nobuhiro Iwamatsu nobuhiro.iwamatsu.yj@renesas.com --- 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))