linux-kernel - [PATCH 1/2] usb: typec: tipd: fix event checking for tps25750

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Message-Id: <20240325-tps6598x_fix_event_handling-v1-1-633fe0c87cc8@wolfvision.net>
Date: Mon, 25 Mar 2024 10:02:21 +0100
From: Javier Carrasco <javier.carrasco@...fvision.net>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Abdel Alkuor <abdelalkuor@...tab.com>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Javier Carrasco <javier.carrasco@...fvision.net>
Subject: [PATCH 1/2] usb: typec: tipd: fix event checking for tps25750

In its current form, the interrupt service routine of the tps25750
checks the event flags in the lowest 64 bits of the interrupt event
register (event[0]), but also in the upper part (event[1]).

Given that all flags are defined as BIT() or BIT_ULL(), they are
restricted to the first 64 bits of the INT_EVENT1 register. Including
the upper part of the register can lead to false positives e.g. if the
event 64 bits above the one being checked is set, but the one being
checked is not.

Restrict the flag checking to the first 64 bits of the INT_EVENT1
register.

Fixes: 7e7a3c815d22 ("USB: typec: tps6598x: Add TPS25750 support")
Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
---
 drivers/usb/typec/tipd/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 0717cfcd9f8c..7c2f01344860 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -604,11 +604,11 @@ static irqreturn_t tps25750_interrupt(int irq, void *data)
 	if (!tps6598x_read_status(tps, &status))
 		goto err_clear_ints;
 
-	if ((event[0] | event[1]) & TPS_REG_INT_POWER_STATUS_UPDATE)
+	if (event[0] & TPS_REG_INT_POWER_STATUS_UPDATE)
 		if (!tps6598x_read_power_status(tps))
 			goto err_clear_ints;
 
-	if ((event[0] | event[1]) & TPS_REG_INT_DATA_STATUS_UPDATE)
+	if (event[0] & TPS_REG_INT_DATA_STATUS_UPDATE)
 		if (!tps6598x_read_data_status(tps))
 			goto err_clear_ints;
 
@@ -617,7 +617,7 @@ static irqreturn_t tps25750_interrupt(int irq, void *data)
 	 * a plug event. Therefore, we need to check
 	 * for pr/dr status change to set TypeC dr/pr accordingly.
 	 */
-	if ((event[0] | event[1]) & TPS_REG_INT_PLUG_EVENT ||
+	if (event[0] & TPS_REG_INT_PLUG_EVENT ||
 	    tps6598x_has_role_changed(tps, status))
 		tps6598x_handle_plug_event(tps, status);
 

-- 
2.40.1