linux-kernel - [PATCH 2/2] usb: typec: tipd: Fix initialization sequence for cd321x

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Message-Id: <20211117151450.207168-3-marcan@marcan.st>
Date:   Thu, 18 Nov 2021 00:14:50 +0900
From:   Hector Martin <marcan@...can.st>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sven Peter <sven@...npeter.dev>
Cc:     Hector Martin <marcan@...can.st>,
        Guido Günther <agx@...xcpu.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] usb: typec: tipd: Fix initialization sequence for cd321x

The power state switch needs to happen first, as that
kickstarts the firmware into normal mode.

Signed-off-by: Hector Martin <marcan@...can.st>
---
 drivers/usb/typec/tipd/core.c | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
index 4da5a0b2aed2..6d27a5b5e3ca 100644
--- a/drivers/usb/typec/tipd/core.c
+++ b/drivers/usb/typec/tipd/core.c
@@ -707,6 +707,7 @@ static int tps6598x_probe(struct i2c_client *client)
 	u32 conf;
 	u32 vid;
 	int ret;
+	u64 mask1;
 
 	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 	if (!tps)
@@ -730,11 +731,6 @@ static int tps6598x_probe(struct i2c_client *client)
 	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 		tps->i2c_protocol = true;
 
-	/* Make sure the controller has application firmware running */
-	ret = tps6598x_check_mode(tps);
-	if (ret)
-		return ret;
-
 	if (np && of_device_is_compatible(np, "apple,cd321x")) {
 		/* Switch CD321X chips to the correct system power state */
 		ret = cd321x_switch_power_state(tps, TPS_SYSTEM_POWER_STATE_S0);
@@ -742,24 +738,27 @@ static int tps6598x_probe(struct i2c_client *client)
 			return ret;
 
 		/* CD321X chips have all interrupts masked initially */
-		ret = tps6598x_write64(tps, TPS_REG_INT_MASK1,
-					APPLE_CD_REG_INT_POWER_STATUS_UPDATE |
-					APPLE_CD_REG_INT_DATA_STATUS_UPDATE |
-					APPLE_CD_REG_INT_PLUG_EVENT);
-		if (ret)
-			return ret;
+		mask1 = APPLE_CD_REG_INT_POWER_STATUS_UPDATE |
+			APPLE_CD_REG_INT_DATA_STATUS_UPDATE |
+			APPLE_CD_REG_INT_PLUG_EVENT;
 
 		irq_handler = cd321x_interrupt;
 	} else {
 		/* Enable power status, data status and plug event interrupts */
-		ret = tps6598x_write64(tps, TPS_REG_INT_MASK1,
-				       TPS_REG_INT_POWER_STATUS_UPDATE |
-				       TPS_REG_INT_DATA_STATUS_UPDATE |
-				       TPS_REG_INT_PLUG_EVENT);
-		if (ret)
-			return ret;
+		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 */
+	ret = tps6598x_check_mode(tps);
+	if (ret)
+		return ret;
+
+	ret = tps6598x_write64(tps, TPS_REG_INT_MASK1, mask1);
+	if (ret)
+		return ret;
+
 	ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
 	if (ret < 0)
 		return ret;
-- 
2.33.0