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[I2C] pxa: provide late suspend and early resume hooks 

Properly hook the I2C driver into the PM code; the previous fix for
this (ece5f7b3c4) worked around the
platform where I2C is required to be available early during resume.

It has been found to be sufficient to use the early resume hook for
this function, so the original hack can die.  Leave the hack in
place for the PIO transfer handler though.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2008-08-26 10:40:50 +01:00 committed by Russell King
parent 387fa6a5ec
commit e7d48fa2b5
1 changed files with 24 additions and 6 deletions
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30
drivers/i2c/busses/i2c-pxa.c
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@ -909,12 +909,6 @@ static int i2c_pxa_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num
struct pxa_i2c *i2c = adap->algo_data;
int ret, i;
/* If the I2C controller is disabled we need to reset it (probably due
to a suspend/resume destroying state). We do this here as we can then
avoid worrying about resuming the controller before its users. */
if (!(readl(_ICR(i2c)) & ICR_IUE))
i2c_pxa_reset(i2c);
for (i = adap->retries; i >= 0; i--) {
ret = i2c_pxa_do_xfer(i2c, msgs, num);
if (ret != I2C_RETRY)
@ -1085,9 +1079,33 @@ static int __exit i2c_pxa_remove(struct platform_device *dev)
return 0;
}
#ifdef CONFIG_PM
static int i2c_pxa_suspend_late(struct platform_device *dev, pm_message_t state)
{
struct pxa_i2c *i2c = platform_get_drvdata(dev);
clk_disable(i2c->clk);
return 0;
}
static int i2c_pxa_resume_early(struct platform_device *dev)
{
struct pxa_i2c *i2c = platform_get_drvdata(dev);
clk_enable(i2c->clk);
i2c_pxa_reset(i2c);
return 0;
}
#else
#define i2c_pxa_suspend_late NULL
#define i2c_pxa_resume_early NULL
#endif
static struct platform_driver i2c_pxa_driver = {
.probe = i2c_pxa_probe,
.remove = __exit_p(i2c_pxa_remove),
.suspend_late = i2c_pxa_suspend_late,
.resume_early = i2c_pxa_resume_early,
.driver = {
.name = "pxa2xx-i2c",
.owner = THIS_MODULE,