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soc: imx: gpcv2: support system suspend/resume

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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: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Lucas Stach 2021-10-02 02:59:43 +02:00 committed by Shawn Guo
parent 656ade7aa4
commit da4112230f
1 changed files with 31 additions and 0 deletions
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31
drivers/soc/imx/gpcv2.c
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@ -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,