netdev - [PATCH v2 2/6] Bluetooth: hci_qca: schedule a devm action for disabling the clock

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Message-Id: <20240708-hci_qca_refactor-v2-2-b6e83b3d1ca5@linaro.org>
Date: Mon, 08 Jul 2024 11:39:25 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Marcel Holtmann <marcel@...tmann.org>, 
 Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Balakrishna Godavarthi <quic_bgodavar@...cinc.com>, 
 Rocky Liao <quic_rjliao@...cinc.com>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v2 2/6] Bluetooth: hci_qca: schedule a devm action for
 disabling the clock

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

In preparation for unduplicating the hci_uart registration code,
schedule a devres action for disabling the SUSCLK rather than doing it
manually.

We cannot really use devm_clk_get_enabled() as we also set the rate
before enabling the clock. While this should in theory work, I don't
want to risk breaking existing users. One solution for the future is to
add devm_clk_get_enabled_with_rate() to the clock framework.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/bluetooth/hci_qca.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index bc6a49ba26f9..a34c663e337c 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -2295,6 +2295,13 @@ static int qca_init_regulators(struct qca_power *qca,
 	return 0;
 }

+static void qca_clk_disable_unprepare(void *data)
+{
+	struct clk *clk = data;
+
+	clk_disable_unprepare(clk);
+}
+
 static int qca_serdev_probe(struct serdev_device *serdev)
 {
 	struct qca_serdev *qcadev;
@@ -2434,10 +2441,15 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 		if (err)
 			return err;

+		err = devm_add_action_or_reset(&serdev->dev,
+					       qca_clk_disable_unprepare,
+					       qcadev->susclk);
+		if (err)
+			return err;
+
 		err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
 		if (err) {
 			BT_ERR("Rome serdev registration failed");
-			clk_disable_unprepare(qcadev->susclk);
 			return err;
 		}
 	}
@@ -2477,15 +2489,9 @@ static void qca_serdev_remove(struct serdev_device *serdev)
 	case QCA_WCN6750:
 	case QCA_WCN6855:
 	case QCA_WCN7850:
-		if (power->vregs_on) {
+		if (power->vregs_on)
 			qca_power_shutdown(&qcadev->serdev_hu);
-			break;
-		}
-		fallthrough;
-
 	default:
-		if (qcadev->susclk)
-			clk_disable_unprepare(qcadev->susclk);
 	}

 	hci_uart_unregister_device(&qcadev->serdev_hu);

-- 
2.43.0