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From:   Abdel Alkuor <alkuor@gmail.com>
To:     heikki.krogerus@linux.intel.com, krzysztof.kozlowski+dt@linaro.org,
        bryan.odonoghue@linaro.org
Cc:     gregkh@linuxfoundation.org, robh+dt@kernel.org,
        linux-usb@vger.kernel.org, devicetree@vger.kernel.org,
        conor+dt@kernel.org, linux-kernel@vger.kernel.org,
        abdelalkuor@geotab.com
Subject: [PATCH v5 08/15] USB: typec: Add interrupt support for TPS25750
Date:   Sun, 17 Sep 2023 11:26:32 -0400
Message-Id: <20230917152639.21443-9-alkuor@gmail.com>
In-Reply-To: <20230917152639.21443-1-alkuor@gmail.com>
References: <20230917152639.21443-1-alkuor@gmail.com>
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From: Abdel Alkuor <abdelalkuor@geotab.com>

Update tps6598x interrupt handler to accommodate tps25750 interrupt

Signed-off-by: Abdel Alkuor <abdelalkuor@geotab.com>
---
 drivers/usb/typec/tipd/core.c | 49 +++++++++++++++++++++++++----------
 1 file changed, 35 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index bd5436fd88fd..17b3bc480f97 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -120,6 +120,7 @@ struct tps6598x {
 	enum power_supply_usb_type usb_type;
 
 	int wakeup;
+	u32 status; /* status reg */
 	u16 pwr_status;
 	struct delayed_work	wq_poll;
 	irq_handler_t irq_handler;
@@ -539,50 +540,71 @@ static irqreturn_t cd321x_interrupt(int irq, void *data)
 	return IRQ_NONE;
 }
 
+static bool tps6598x_has_role_changed(struct tps6598x *tps, u32 status)
+{
+	status ^= tps->status;
+
+	return status & (TPS_STATUS_PORTROLE | TPS_STATUS_DATAROLE);
+}
+
 static irqreturn_t tps6598x_interrupt(int irq, void *data)
 {
 	struct tps6598x *tps = data;
-	u64 event1 = 0;
-	u64 event2 = 0;
+	u64 event[2] = { };
 	u32 status;
 	int ret;
 
 	mutex_lock(&tps->lock);
 
-	ret = tps6598x_read64(tps, TPS_REG_INT_EVENT1, &event1);
-	ret |= tps6598x_read64(tps, TPS_REG_INT_EVENT2, &event2);
+	if (tps->is_tps25750) {
+		ret = tps6598x_block_read(tps, TPS_REG_INT_EVENT1, event, 11);
+	} else {
+		ret = tps6598x_read64(tps, TPS_REG_INT_EVENT1, &event[0]);
+		ret |= tps6598x_read64(tps, TPS_REG_INT_EVENT2, &event[1]);
+	}
+
 	if (ret) {
 		dev_err(tps->dev, "%s: failed to read events\n", __func__);
 		goto err_unlock;
 	}
-	trace_tps6598x_irq(event1, event2);
+	trace_tps6598x_irq(event[0], event[1]);
 
-	if (!(event1 | event2))
+	if (!(event[0] | event[1]))
 		goto err_unlock;
 
 	if (!tps6598x_read_status(tps, &status))
 		goto err_clear_ints;
 
-	if ((event1 | event2) & TPS_REG_INT_POWER_STATUS_UPDATE)
+	if ((event[0] | event[1]) & TPS_REG_INT_POWER_STATUS_UPDATE)
 		if (!tps6598x_read_power_status(tps))
 			goto err_clear_ints;
 
-	if ((event1 | event2) & TPS_REG_INT_DATA_STATUS_UPDATE)
+	if ((event[0] | event[1]) & TPS_REG_INT_DATA_STATUS_UPDATE)
 		if (!tps6598x_read_data_status(tps))
 			goto err_clear_ints;
 
-	/* Handle plug insert or removal */
-	if ((event1 | event2) & TPS_REG_INT_PLUG_EVENT)
+	/*
+	 * data/port roles could be updated independently after
+	 * 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 ||
+		tps6598x_has_role_changed(tps, status))
 		tps6598x_handle_plug_event(tps, status);
 
+	tps->status = status;
 err_clear_ints:
-	tps6598x_write64(tps, TPS_REG_INT_CLEAR1, event1);
-	tps6598x_write64(tps, TPS_REG_INT_CLEAR2, event2);
+	if (tps->is_tps25750) {
+		tps6598x_block_write(tps, TPS_REG_INT_CLEAR1, event, 11);
+	} else {
+		tps6598x_write64(tps, TPS_REG_INT_CLEAR1, event[0]);
+		tps6598x_write64(tps, TPS_REG_INT_CLEAR2, event[1]);
+	}
 
 err_unlock:
 	mutex_unlock(&tps->lock);
 
-	if (event1 | event2)
+	if (event[0] | event[1])
 		return IRQ_HANDLED;
 	return IRQ_NONE;
 }
@@ -1003,7 +1025,6 @@ static int tps6598x_probe(struct i2c_client *client)
 
 		irq_handler = cd321x_interrupt;
 	} else {
-
 		tps->is_tps25750 = of_device_is_compatible(np, "ti,tps25750");
 		/* Enable power status, data status and plug event interrupts */
 		mask1 = TPS_REG_INT_POWER_STATUS_UPDATE |
-- 
2.34.1