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i2c: sirf: retry 3 times as sometimes we get random noack and timeout 

let i2c core retry 3 times as sometimes we get random noack and timeout
even when we access an existing i2c client.

Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Zhiwu Song 2013-08-13 17:11:31 +08:00 committed by Wolfram Sang
parent 5ebffa6b5e
commit 617da00cb1
1 changed files with 2 additions and 1 deletions
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3
drivers/i2c/busses/i2c-sirf.c
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@ -229,7 +229,7 @@ static int i2c_sirfsoc_xfer_msg(struct sirfsoc_i2c *siic, struct i2c_msg *msg)
while (readl(siic->base + SIRFSOC_I2C_CTRL) & SIRFSOC_I2C_RESET) while (readl(siic->base + SIRFSOC_I2C_CTRL) & SIRFSOC_I2C_RESET)
cpu_relax(); cpu_relax();
} }
return siic->err_status ? -EIO : 0; return siic->err_status ? -EAGAIN : 0;
} }
static u32 i2c_sirfsoc_func(struct i2c_adapter *adap) static u32 i2c_sirfsoc_func(struct i2c_adapter *adap)
@ -333,6 +333,7 @@ static int i2c_sirfsoc_probe(struct platform_device *pdev)
adap->algo = &i2c_sirfsoc_algo; adap->algo = &i2c_sirfsoc_algo;
adap->algo_data = siic; adap->algo_data = siic;
adap->retries = 3;
adap->dev.of_node = pdev->dev.of_node; adap->dev.of_node = pdev->dev.of_node;
adap->dev.parent = &pdev->dev; adap->dev.parent = &pdev->dev;