TODO: usb: typec: tipd: keep default interrupts enabled during probe()

TODO: mainline the interrupt handling for all events that we need,
revert this patch and instead exted this mask accordingly.

Commit 9990f2f6 ("usb: typec: tipd: Enable event interrupts by default")
writes a fixed set of interrupts to TPS_REG_INT_MASK1. In case interrupts
had been enabled by the firmware by default, these get disabled now
which can break use cases. Only append to what is already enabled instead.

Fixes: 9990f2f6

 ("usb: typec: tipd: Enable event interrupts by default")
Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>

drivers/usb/typec/tipd/core.c

@@ -1040,10 +1040,14 @@ static int tps6598x_probe(struct i2c_client *client)
 
 		irq_handler = cd321x_interrupt;
 	} else {
+		ret = tps6598x_read64(tps, TPS_REG_INT_MASK1, &mask1);
+		if (ret)
+			return ret;
+
 		/* Enable power status, data status and plug event interrupts */
-		mask1 = TPS_REG_INT_POWER_STATUS_UPDATE |
-			TPS_REG_INT_DATA_STATUS_UPDATE |
-			TPS_REG_INT_PLUG_EVENT;
+		mask1 |= TPS_REG_INT_POWER_STATUS_UPDATE |
+			 TPS_REG_INT_DATA_STATUS_UPDATE |
+			 TPS_REG_INT_PLUG_EVENT;
 	}
 
 	/* Make sure the controller has application firmware running */