linux-kernel - [PATCH v1] usb: typec: tipd: keep default interrupts enabled during probe()

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Date:   Mon, 10 Jan 2022 17:35:59 +0100
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org,
        sven@...npeter.dev, hdegoede@...hat.com, marcan@...can.st
Cc:     kernel@...i.sm, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Martin Kepplinger <martin.kepplinger@...i.sm>
Subject: [PATCH v1] usb: typec: tipd: keep default interrupts enabled during probe()

Commit 9990f2f6264c ("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: 9990f2f6264c ("usb: typec: tipd: Enable event interrupts by default")
Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
---
 drivers/usb/typec/tipd/core.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 6d27a5b5e3ca..365ee5494c15 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -744,10 +744,14 @@ 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 */
-- 
2.30.2