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i2c: s3c2410: Add fix for i2c suspend/resume

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The I2C driver makes a gpio_request during initialization. This request
happens again on resume and fails due to the earlier successful request.
Re-factor the code to only initialize the gpios during probe.

Errors on resume without this:
[   16.020000] s3c-i2c s3c2440-i2c.0: gpio [42] request failed
[   16.020000] s3c-i2c s3c2440-i2c.1: gpio [44] request failed
[   16.020000] s3c-i2c s3c2440-i2c.2: gpio [6] request failed

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Abhilash Kesavan 2012-11-19 15:47:17 +05:30 committed by Wolfram Sang
parent 3b2f3ceb3c
commit 658122fe5e
1 changed files with 9 additions and 7 deletions
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16
drivers/i2c/busses/i2c-s3c2410.c
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@ -908,13 +908,6 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
pdata = i2c->pdata;
/* inititalise the gpio */
if (pdata->cfg_gpio)
pdata->cfg_gpio(to_platform_device(i2c->dev));
else if (IS_ERR(i2c->pctrl) && s3c24xx_i2c_parse_dt_gpio(i2c))
return -EINVAL;
/* write slave address */
writeb(pdata->slave_addr, i2c->regs + S3C2410_IICADD);
@ -1055,6 +1048,15 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
i2c->pctrl = devm_pinctrl_get_select_default(i2c->dev);
/* inititalise the i2c gpio lines */
if (i2c->pdata->cfg_gpio) {
i2c->pdata->cfg_gpio(to_platform_device(i2c->dev));
} else if (IS_ERR(i2c->pctrl) && s3c24xx_i2c_parse_dt_gpio(i2c)) {
ret = -EINVAL;
goto err_clk;
}
/* initialise the i2c controller */
ret = s3c24xx_i2c_init(i2c);