linux-kernel - [PATCH v3 1/9] serial: qcom-geni: fix polled console initialisation

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Message-ID: <20241009145110.16847-2-johan+linaro@kernel.org>
Date: Wed,  9 Oct 2024 16:51:02 +0200
From: Johan Hovold <johan+linaro@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jirislaby@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Douglas Anderson <dianders@...omium.org>,
	Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	Johan Hovold <johan+linaro@...nel.org>,
	stable@...r.kernel.org
Subject: [PATCH v3 1/9] serial: qcom-geni: fix polled console initialisation

The polled console (KGDB/KDB) implementation must not call port setup
unconditionally as the port may already be in use by the console or a
getty.

Only make sure that the receiver is enabled, but do not enable any
device interrupts.

Fixes: d8851a96ba25 ("tty: serial: qcom-geni-serial: Add a poll_init() function")
Cc: stable@...r.kernel.org	# 6.4
Cc: Douglas Anderson <dianders@...omium.org>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/tty/serial/qcom_geni_serial.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 6f0db310cf69..c237c9d107cd 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -147,6 +147,7 @@ static struct uart_driver qcom_geni_uart_driver;
 
 static void __qcom_geni_serial_cancel_tx_cmd(struct uart_port *uport);
 static void qcom_geni_serial_cancel_tx_cmd(struct uart_port *uport);
+static int qcom_geni_serial_port_setup(struct uart_port *uport);
 
 static inline struct qcom_geni_serial_port *to_dev_port(struct uart_port *uport)
 {
@@ -395,6 +396,23 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport,
 	writel(c, uport->membase + SE_GENI_TX_FIFOn);
 	qcom_geni_serial_poll_tx_done(uport);
 }
+
+static int qcom_geni_serial_poll_init(struct uart_port *uport)
+{
+	struct qcom_geni_serial_port *port = to_dev_port(uport);
+	int ret;
+
+	if (!port->setup) {
+		ret = qcom_geni_serial_port_setup(uport);
+		if (ret)
+			return ret;
+	}
+
+	if (!qcom_geni_serial_secondary_active(uport))
+		geni_se_setup_s_cmd(&port->se, UART_START_READ, 0);
+
+	return 0;
+}
 #endif
 
 #ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE
@@ -1582,7 +1600,7 @@ static const struct uart_ops qcom_geni_console_pops = {
 #ifdef CONFIG_CONSOLE_POLL
 	.poll_get_char	= qcom_geni_serial_get_char,
 	.poll_put_char	= qcom_geni_serial_poll_put_char,
-	.poll_init = qcom_geni_serial_port_setup,
+	.poll_init = qcom_geni_serial_poll_init,
 #endif
 	.pm = qcom_geni_serial_pm,
 };
-- 
2.45.2