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serial: qcom-geni: fix polled console initialisation 

commit 4bef7c6f299910f19876ad8e7f5897514855f1d2 upstream.

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: d8851a96ba ("tty: serial: qcom-geni-serial: Add a poll_init() function")
Cc: stable@vger.kernel.org	# 6.4
Cc: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20241009145110.16847-2-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2024-10-09 16:51:02 +02:00 committed by Greg Kroah-Hartman
parent 6acd19ad3a
commit 90e3f819e6
1 changed files with 20 additions and 1 deletions
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21
drivers/tty/serial/qcom_geni_serial.c
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@ -144,6 +144,8 @@ static const struct uart_ops qcom_geni_uart_pops;
static struct uart_driver qcom_geni_console_driver;
static struct uart_driver qcom_geni_uart_driver;
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)
{
return container_of(uport, struct qcom_geni_serial_port, uport);
@ -385,6 +387,23 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport,
writel(M_TX_FIFO_WATERMARK_EN, uport->membase + SE_GENI_M_IRQ_CLEAR);
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
@ -1544,7 +1563,7 @@ 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,
};