From: Tim Harvey Subject: [PATCH] i2c: imx: retry on NAK In case of busy i2c try again to get ACK. Signed-off-by: Tim Harvey Tested-by: Luka Perkov --- drivers/i2c/busses/i2c-imx.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -62,6 +62,7 @@ /* Default value */ #define IMX_I2C_BIT_RATE 100000 /* 100kHz */ +#define IMX_I2C_MAX_RETRIES 3 /* number of retries to attempt */ /* IMX I2C registers: * the I2C register offset is different between SoCs, @@ -298,7 +299,7 @@ static int i2c_imx_acked(struct imx_i2c_ { if (imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR) & I2SR_RXAK) { dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__); - return -EIO; /* No ACK */ + return -EAGAIN; /* try again */ } dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__); @@ -635,6 +636,7 @@ static int i2c_imx_probe(struct platform i2c_imx->adapter.dev.parent = &pdev->dev; i2c_imx->adapter.nr = pdev->id; i2c_imx->adapter.dev.of_node = pdev->dev.of_node; + i2c_imx->adapter.retries = IMX_I2C_MAX_RETRIES; i2c_imx->base = base; /* Get I2C clock */