linux-kernel - [PATCH v4 5/8] serial: qcom-geni: move resource control logic to separate functions

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Message-ID: <20250502171417.28856-6-quic_ptalari@quicinc.com>
Date: Fri, 2 May 2025 22:44:14 +0530
From: Praveen Talari <quic_ptalari@...cinc.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby
	<jirislaby@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        "Praveen
 Talari" <quic_ptalari@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: <psodagud@...cinc.com>, <djaggi@...cinc.com>, <quic_msavaliy@...cinc.com>,
        <quic_vtanuku@...cinc.com>, <quic_arandive@...cinc.com>,
        <quic_mnaresh@...cinc.com>, <quic_shazhuss@...cinc.com>
Subject: [PATCH v4 5/8] serial: qcom-geni: move resource control logic to separate functions

Supports use in PM system/runtime frameworks, helping to
distinguish new resource control mechanisms and facilitate
future modifications within the new API.

The code that handles the actual enable or disable of resources
like clock and ICC paths to a separate function
(geni_serial_resources_on() and geni_serial_resources_off()) which
enhances code readability.

Signed-off-by: Praveen Talari <quic_ptalari@...cinc.com>
---
v3 -> v4
- added version log after ---

v1 -> v2
- returned 0 instead of ret variable
---
 drivers/tty/serial/qcom_geni_serial.c | 54 +++++++++++++++++++++------
 1 file changed, 42 insertions(+), 12 deletions(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 6ad759146f71..2cd2085473f3 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -1588,6 +1588,42 @@ static struct uart_driver qcom_geni_uart_driver = {
 	.nr =  GENI_UART_PORTS,
 };
 
+static int geni_serial_resources_off(struct uart_port *uport)
+{
+	struct qcom_geni_serial_port *port = to_dev_port(uport);
+	int ret;
+
+	dev_pm_opp_set_rate(uport->dev, 0);
+	ret = geni_se_resources_off(&port->se);
+	if (ret)
+		return ret;
+
+	geni_icc_disable(&port->se);
+
+	return 0;
+}
+
+static int geni_serial_resources_on(struct uart_port *uport)
+{
+	struct qcom_geni_serial_port *port = to_dev_port(uport);
+	int ret;
+
+	ret = geni_icc_enable(&port->se);
+	if (ret)
+		return ret;
+
+	ret = geni_se_resources_on(&port->se);
+	if (ret) {
+		geni_icc_disable(&port->se);
+		return ret;
+	}
+
+	if (port->clk_rate)
+		dev_pm_opp_set_rate(uport->dev, port->clk_rate);
+
+	return 0;
+}
+
 static int geni_serial_resource_init(struct qcom_geni_serial_port *port)
 {
 	int ret;
@@ -1628,23 +1664,17 @@ static int geni_serial_resource_init(struct qcom_geni_serial_port *port)
 static void qcom_geni_serial_pm(struct uart_port *uport,
 		unsigned int new_state, unsigned int old_state)
 {
-	struct qcom_geni_serial_port *port = to_dev_port(uport);
 
 	/* If we've never been called, treat it as off */
 	if (old_state == UART_PM_STATE_UNDEFINED)
 		old_state = UART_PM_STATE_OFF;
 
-	if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF) {
-		geni_icc_enable(&port->se);
-		if (port->clk_rate)
-			dev_pm_opp_set_rate(uport->dev, port->clk_rate);
-		geni_se_resources_on(&port->se);
-	} else if (new_state == UART_PM_STATE_OFF &&
-			old_state == UART_PM_STATE_ON) {
-		geni_se_resources_off(&port->se);
-		dev_pm_opp_set_rate(uport->dev, 0);
-		geni_icc_disable(&port->se);
-	}
+	if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF)
+		geni_serial_resources_on(uport);
+	else if (new_state == UART_PM_STATE_OFF &&
+			old_state == UART_PM_STATE_ON)
+		geni_serial_resources_off(uport);
+
 }
 
 static const struct uart_ops qcom_geni_console_pops = {
-- 
2.17.1