Commit 747bdf91 authored by Ji Sheng Teoh's avatar Ji Sheng Teoh Committed by Andi Shyti
Browse files

i2c: cadence: Add system suspend and resume PM support 



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: default avatarJi Sheng Teoh <jisheng.teoh@starfivetech.com>
Reviewed-by: default avatarAndi Shyti <andi.shyti@kernel.org>
Signed-off-by: default avatarAndi Shyti <andi.shyti@kernel.org>
parent d0e94415

drivers/i2c/busses/i2c-cadence.c

+33 −0
Original line number Diff line number Diff line
@@ -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)

};