Commit da411223 authored by Lucas Stach's avatar Lucas Stach Committed by Shawn Guo
Browse files

soc: imx: gpcv2: support system suspend/resume 



Our usage of runtime PM to control the hierarchy of power domains is
slightly unusual and means that powering up a domain may fail in early
system resume, as runtime PM is still disallowed at this stage.

However the system suspend/resume path takes care of powering down/up
the power domains in the order defined by the device parent/child and
power-domain provider/consumer hierarachy. So we can just runtime
resume all our power-domain devices to allow the power-up to work
properly in the resume path. System suspend will still disable all
domains as intended.

Signed-off-by: default avatarLucas Stach <l.stach@pengutronix.de>
Acked-by: default avatarPeng Fan <peng.fan@nxp.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 656ade7a

drivers/soc/imx/gpcv2.c

+31 −0
Original line number Diff line number Diff line
@@ -948,6 +948,36 @@ static int imx_pgc_domain_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int imx_pgc_domain_suspend(struct device *dev)

{

	int ret;



	/*

	 * This may look strange, but is done so the generic PM_SLEEP code

	 * can power down our domain and more importantly power it up again

	 * after resume, without tripping over our usage of runtime PM to

	 * power up/down the nested domains.

	 */

	ret = pm_runtime_get_sync(dev);

	if (ret < 0) {

		pm_runtime_put_noidle(dev);

		return ret;

	}



	return 0;

}



static int imx_pgc_domain_resume(struct device *dev)

{

	return pm_runtime_put(dev);

}

#endif



static const struct dev_pm_ops imx_pgc_domain_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(imx_pgc_domain_suspend, imx_pgc_domain_resume)

};



static const struct platform_device_id imx_pgc_domain_id[] = {

	{ "imx-pgc-domain", },

	{ },
@@ -956,6 +986,7 @@ static const struct platform_device_id imx_pgc_domain_id[] = { 
static struct platform_driver imx_pgc_domain_driver = {

	.driver = {

		.name = "imx-pgc",

		.pm = &imx_pgc_domain_pm_ops,

	},

	.probe    = imx_pgc_domain_probe,

	.remove   = imx_pgc_domain_remove,