linux-kernel - [PATCH v2] usb: typec: tcpci_rt1711h: Unmask alert interrupts to fix functionality

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Message-ID: <20250219114700.41700-1-angelogioacchino.delregno@collabora.com>
Date: Wed, 19 Feb 2025 12:47:00 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: heikki.krogerus@...ux.intel.com
Cc: gregkh@...uxfoundation.org,
	andre.draszik@...aro.org,
	angelogioacchino.delregno@...labora.com,
	linux@...ck-us.net,
	shufan_lee@...htek.com,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel@...labora.com,
	pablo.sun@...iatek.com
Subject: [PATCH v2] usb: typec: tcpci_rt1711h: Unmask alert interrupts to fix functionality

During probe, the TCPC alert interrupts are getting masked to
avoid unwanted interrupts during chip setup: this is ok to do
but there is no unmasking happening at any later time, which
means that the chip will not raise any interrupt, essentially
making it not functional as, while internally it does perform
all of the intended functions, it won't signal anything to the
outside.

Unmask the alert interrupts to fix functionality.

Fixes: ce08eaeb6388 ("staging: typec: rt1711h typec chip driver")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---

Changes in v2:
 - Moved interrupts enablement call to before enabling irq wakeup as
   enable_irq_wake() cannot fail, and if anything goes wrong, since the
   interrupt was previously requested with devm, no further action is
   needed. Thanks Greg!

 drivers/usb/typec/tcpm/tcpci_rt1711h.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/usb/typec/tcpm/tcpci_rt1711h.c b/drivers/usb/typec/tcpm/tcpci_rt1711h.c
index 64f6dd0dc660..88c50b984e8a 100644
--- a/drivers/usb/typec/tcpm/tcpci_rt1711h.c
+++ b/drivers/usb/typec/tcpm/tcpci_rt1711h.c
@@ -334,6 +334,11 @@ static int rt1711h_probe(struct i2c_client *client)
 {
 	int ret;
 	struct rt1711h_chip *chip;
+	const u16 alert_mask = TCPC_ALERT_TX_SUCCESS | TCPC_ALERT_TX_DISCARDED |
+			       TCPC_ALERT_TX_FAILED | TCPC_ALERT_RX_HARD_RST |
+			       TCPC_ALERT_RX_STATUS | TCPC_ALERT_POWER_STATUS |
+			       TCPC_ALERT_CC_STATUS | TCPC_ALERT_RX_BUF_OVF |
+			       TCPC_ALERT_FAULT;
 
 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
@@ -382,6 +387,12 @@ static int rt1711h_probe(struct i2c_client *client)
 					dev_name(chip->dev), chip);
 	if (ret < 0)
 		return ret;
+
+	/* Enable alert interrupts */
+	ret = rt1711h_write16(chip, TCPC_ALERT_MASK, alert_mask);
+	if (ret < 0)
+		return ret;
+
 	enable_irq_wake(client->irq);
 
 	return 0;
-- 
2.48.1