Add a minimalistic suspend/resume PM support.
Signed-off-by: Stefan Wahren <wahrenst@xxxxxxx>
---
drivers/mmc/host/bcm2835.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index 107666b7c1c8..17c327b7b5cc 100644
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -1343,6 +1343,30 @@ static int bcm2835_add_host(struct bcm2835_host *host)
return 0;
}
+static int bcm2835_suspend(struct device *dev)
+{
+ struct bcm2835_host *host = dev_get_drvdata(dev);
+
+ if (!host->data_complete) {
+ dev_warn(dev, "Suspend is prevented\n");
+ return -EBUSY;
+ }
+
+ clk_disable_unprepare(host->clk);
+
+ return 0;
+}
+
+static int bcm2835_resume(struct device *dev)
+{
+ struct bcm2835_host *host = dev_get_drvdata(dev);
+
+ return clk_prepare_enable(host->clk);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(bcm2835_pm_ops, bcm2835_suspend,
+ bcm2835_resume);
+
static int bcm2835_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -1471,6 +1495,7 @@ static struct platform_driver bcm2835_driver = {
.name = "sdhost-bcm2835",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = bcm2835_match,
+ .pm = pm_ptr(&bcm2835_pm_ops),
},
};
module_platform_driver(bcm2835_driver);
--
2.34.1
