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authorLucas Stach <l.stach@pengutronix.de>2021-07-21 22:01:45 +0200
committerLucas Stach <l.stach@pengutronix.de>2021-07-21 22:25:58 +0200
commit53bc02a6c11145b9d5e28c785d82725903ec022b (patch)
tree3caad35896e24e7e232336cfc7b9157f7b804125
parentb33cc04f1b5840768df56d7ce60ebfdb9307d2d8 (diff)
downloadlinux-53bc02a6c11145b9d5e28c785d82725903ec022b.tar.gz
linux-53bc02a6c11145b9d5e28c785d82725903ec022b.tar.xz
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: Lucas Stach <l.stach@pengutronix.de>
-rw-r--r--drivers/soc/imx/gpcv2.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
index c48f37f203ab..57ed0a6bfb13 100644
--- a/drivers/soc/imx/gpcv2.c
+++ b/drivers/soc/imx/gpcv2.c
@@ -947,6 +947,36 @@ 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", },
{ },
@@ -955,6 +985,7 @@ 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,