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i2c: cadence: Add system suspend and resume PM support

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Enable device system suspend and resume PM support, and mark the device
state as suspended during system suspend to reject any data transfer.

Signed-off-by: Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
This commit is contained in:
Ji Sheng Teoh 2024-01-19 09:33:26 +08:00 committed by Andi Shyti
parent d0e9441504
commit 747bdf912e
1 changed files with 33 additions and 0 deletions
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33
drivers/i2c/busses/i2c-cadence.c
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@ -1176,6 +1176,18 @@ static int __maybe_unused cdns_i2c_runtime_suspend(struct device *dev)
return 0;
}
static int __maybe_unused cdns_i2c_suspend(struct device *dev)
{
struct cdns_i2c *xi2c = dev_get_drvdata(dev);
i2c_mark_adapter_suspended(&xi2c->adap);
if (!pm_runtime_status_suspended(dev))
return cdns_i2c_runtime_suspend(dev);
return 0;
}
/**
* cdns_i2c_init - Controller initialisation
* @id: Device private data structure
@ -1219,7 +1231,28 @@ static int __maybe_unused cdns_i2c_runtime_resume(struct device *dev)
return 0;
}
static int __maybe_unused cdns_i2c_resume(struct device *dev)
{
struct cdns_i2c *xi2c = dev_get_drvdata(dev);
int err;
err = cdns_i2c_runtime_resume(dev);
if (err)
return err;
if (pm_runtime_status_suspended(dev)) {
err = cdns_i2c_runtime_suspend(dev);
if (err)
return err;
}
i2c_mark_adapter_resumed(&xi2c->adap);
return 0;
}
static const struct dev_pm_ops cdns_i2c_dev_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(cdns_i2c_suspend, cdns_i2c_resume)
SET_RUNTIME_PM_OPS(cdns_i2c_runtime_suspend,
cdns_i2c_runtime_resume, NULL)
};