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: Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c
index de3f58b60dce5d465f75e3bc509ea449f0c927d0..4bb7d6756947cd16a9ab64295dfaa650bd58677f 100644 (file)
--- a/drivers/i2c/busses/i2c-cadence.c
+++ b/drivers/i2c/busses/i2c-cadence.c
@@ -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)
 };