--- zzzz-none-000/linux-5.4.213/drivers/tty/serial/serial_core.c	2022-09-15 10:04:56.000000000 +0000
+++ alder-5690pro-762/linux-5.4.213/drivers/tty/serial/serial_core.c	2024-08-14 09:02:08.000000000 +0000
@@ -22,6 +22,7 @@
 #include <linux/serial_core.h>
 #include <linux/delay.h>
 #include <linux/mutex.h>
+#include <linux/pm_runtime.h>
 #include <linux/security.h>
 
 #include <linux/irq.h>
@@ -2089,8 +2090,10 @@
 	 * early.
 	 * If this port is a console, then the spinlock is already
 	 * initialised.
+	 * AVM: This should also hold true for devices used with tty polling.
 	 */
-	if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) {
+	if (!((uart_console(port) && (port->cons->flags & CON_ENABLED))
+			|| port->flags)) {
 		spin_lock_init(&port->lock);
 		lockdep_set_class(&port->lock, &port_lock_key);
 	}
@@ -2483,6 +2486,11 @@
 	if (!port)
 		return;
 
+	if(IS_ENABLED(CONFIG_CONSOLE_POLL)){
+		port->ops->poll_put_char(port, ch);
+		return;
+	}
+
 	if (ch == '\n')
 		port->ops->poll_put_char(port, '\r');
 	port->ops->poll_put_char(port, ch);
@@ -2533,6 +2541,189 @@
 	.shutdown	= uart_tty_port_shutdown,
 };
 
+#ifdef CONFIG_AVM_TTY_POLLING
+struct polling_tty_port {
+	struct tty_driver *driver;
+	int                line;
+};
+
+struct polling_tty_port *avm_tty_poll_acquire(const char *ttyname)
+{
+	struct polling_tty_port *pport;
+	struct tty_driver *ttydrv;
+	struct uart_driver *drv;
+	struct uart_state *state;
+	struct uart_port *uport;
+	struct tty_port *port;
+	int line, err;
+	char name[40];
+
+	pr_debug("Acquiring polling tty port %s\n", ttyname);
+
+	strscpy(name, ttyname, sizeof(name));
+	ttydrv = tty_find_polling_driver(name, &line);
+	if (!ttydrv) {
+		err = -ENODEV;
+		goto err_out;
+	}
+
+	drv = ttydrv->driver_state;
+	state = drv->state + line;
+	if (!state)
+		goto noport;
+	port = &state->port;
+
+	mutex_lock(&port->mutex);
+
+	uport = state->uart_port;
+	if (!uport) {
+		mutex_unlock(&port->mutex);
+		goto noport;
+	}
+
+	pport = kmalloc(sizeof(*pport), GFP_KERNEL);
+	if (!pport) {
+		err = -ENOMEM;
+		mutex_unlock(&port->mutex);
+		goto put_driver;
+	}
+	// This can be omitted for Puna and GRX
+	uport->ops->startup(uport);
+	if (uport->irq)
+		disable_irq(uport->irq);
+
+	pm_runtime_get_sync(uport->dev);
+
+	mutex_unlock(&port->mutex);
+
+	pport->driver = ttydrv;
+	pport->line = line;
+
+	return pport;
+noport:
+	pr_err("No port state for %s\n", ttyname);
+	err = -EL3HLT;
+put_driver:
+	put_tty_driver(ttydrv);
+err_out:
+	pr_err("Error acquiring polling tty port %s: %d\n", ttyname, err);
+
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL(avm_tty_poll_acquire);
+
+int avm_tty_poll_configure(struct polling_tty_port *pport, int baud,
+		int parity, int bits, int flow)
+{
+	struct tty_driver *ttydrv = pport->driver;
+	struct uart_driver *drv;
+	struct uart_state *state;
+	struct uart_port *uport;
+	struct tty_port *port;
+
+	pr_debug("Setting polling tty port %s%d to %u baud\n",
+			ttydrv->name, pport->line, baud);
+
+	drv = ttydrv->driver_state;
+	state = drv->state + pport->line;
+	if (!state)
+		goto noport;
+	port = &state->port;
+
+	mutex_lock(&port->mutex);
+	uport = state->uart_port;
+	if (!uport) {
+		mutex_unlock(&port->mutex);
+		goto noport;
+	}
+	uart_set_options(uport, NULL, baud, parity, bits, flow);
+	mutex_unlock(&port->mutex);
+
+	return 0;
+noport:
+	pr_err("Error setting baudrate of polling tty port %s%d: no port state\n",
+			ttydrv->name, pport->line);
+	return -EL3HLT;
+}
+EXPORT_SYMBOL(avm_tty_poll_configure);
+
+void avm_tty_poll_release(struct polling_tty_port *pport)
+{
+	struct tty_driver *ttydrv = pport->driver;
+	struct uart_driver *drv;
+	struct uart_state *state;
+	struct uart_port *uport;
+	struct tty_port *port;
+
+	pr_debug("Releasing polling tty port %s%d\n",
+			ttydrv->name, pport->line);
+
+	drv = ttydrv->driver_state;
+	state = drv->state + pport->line;
+	if (!state)
+		goto out;
+
+	port = &state->port;
+	mutex_lock(&port->mutex);
+
+	uport = state->uart_port;
+	if (!uport) {
+		mutex_unlock(&port->mutex);
+		goto out;
+	}
+
+	if (uport->irq)
+		enable_irq(uport->irq);
+
+	pm_runtime_put(uport->dev);
+	// This can be omitted for Puna and GRX
+	uport->ops->shutdown(uport);
+	mutex_unlock(&port->mutex);
+out:
+	put_tty_driver(ttydrv);
+	kfree(pport);
+}
+EXPORT_SYMBOL(avm_tty_poll_release);
+
+int avm_tty_poll_get_char(struct polling_tty_port *pport)
+{
+	return pport->driver->ops->poll_get_char(pport->driver, pport->line);
+}
+EXPORT_SYMBOL(avm_tty_poll_get_char);
+
+void avm_tty_poll_put_char(struct polling_tty_port *pport, unsigned char c)
+{
+	pport->driver->ops->poll_put_char(pport->driver, pport->line, c);
+}
+EXPORT_SYMBOL(avm_tty_poll_put_char);
+#endif /* CONFIG_AVM_TTY_POLLING */
+
+#ifdef CONFIG_INTEL_UART_ENABLE_CONTROL
+static ssize_t uart_get_attr_enable_ctrl(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	int enable;
+
+	if (intel_ce2700_read_atom_uartctrl(&enable) != IOCNFG_OK)
+		pr_err(KERN_ERR "Unable to read AtomUartCtrl status\n");
+
+	return sprintf(buf, "%d\n", enable);
+}
+
+static ssize_t uart_set_attr_enable_ctrl(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	int enable;
+
+	enable = (int)(buf[0] - '0');
+	if ((enable == 0) || (enable == 1))
+		intel_ce2700_config_atom_uartctrl(enable);
+	else
+		pr_info(KERN_ERR "uart_enable_ctrl: 0(disable) / 1(enable) UART\n");
+
+	return count;
+}
+#endif
 /**
  *	uart_register_driver - register a driver with the uart core layer
  *	@drv: low level driver structure