From 1543e317f1da31b75942316931e8f491a8920811 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Thu, 04 Jan 2024 10:08:02 +0000
Subject: [PATCH] disable FB
---
kernel/drivers/tty/serial/8250/8250_core.c | 51 +++++++++++++++++++++++++++++++++++++++++++--------
1 files changed, 43 insertions(+), 8 deletions(-)
diff --git a/kernel/drivers/tty/serial/8250/8250_core.c b/kernel/drivers/tty/serial/8250/8250_core.c
index 4e1d450..0a29e86 100644
--- a/kernel/drivers/tty/serial/8250/8250_core.c
+++ b/kernel/drivers/tty/serial/8250/8250_core.c
@@ -14,6 +14,7 @@
* serial8250_register_8250_port() ports
*/
+#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/ioport.h>
@@ -22,6 +23,7 @@
#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/tty.h>
#include <linux/ratelimit.h>
#include <linux/tty_flip.h>
@@ -130,12 +132,8 @@
l = l->next;
- if (l == i->head && pass_counter++ > PASS_LIMIT) {
- /* If we hit this, we're dead. */
- printk_ratelimited(KERN_ERR
- "serial8250: too much work for irq%d\n", irq);
+ if (l == i->head && pass_counter++ > PASS_LIMIT)
break;
- }
} while (l != end);
spin_unlock(&i->lock);
@@ -334,9 +332,9 @@
* hardware interrupt, we use a timer-based system. The original
* driver used to do this with IRQ0.
*/
- if (!port->irq) {
+ if (!port->irq)
mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
- } else
+ else
retval = serial_link_irq_chain(up);
return retval;
@@ -575,6 +573,9 @@
up->port.dev = dev;
+ if (uart_console_enabled(&up->port))
+ pm_runtime_get_sync(up->port.dev);
+
serial8250_apply_quirks(up);
uart_add_one_port(drv, &up->port);
}
@@ -611,6 +612,14 @@
if (retval != 0)
port->cons = NULL;
return retval;
+}
+
+static int univ8250_console_exit(struct console *co)
+{
+ struct uart_port *port;
+
+ port = &serial8250_ports[co->index].port;
+ return serial8250_console_exit(port);
}
/**
@@ -671,6 +680,7 @@
.write = univ8250_console_write,
.device = uart_console_device,
.setup = univ8250_console_setup,
+ .exit = univ8250_console_exit,
.match = univ8250_console_match,
.flags = CON_PRINTBUFFER | CON_ANYTIME,
.index = -1,
@@ -758,6 +768,7 @@
if (!console_suspend_enabled && uart_console(port) &&
port->type != PORT_8250) {
unsigned char canary = 0xa5;
+
serial_out(up, UART_SCR, canary);
if (serial_in(up, UART_SCR) == canary)
up->canary = canary;
@@ -820,6 +831,7 @@
uart.port.flags = p->flags;
uart.port.mapbase = p->mapbase;
uart.port.hub6 = p->hub6;
+ uart.port.has_sysrq = p->has_sysrq;
uart.port.private_data = p->private_data;
uart.port.type = p->type;
uart.port.serial_in = p->serial_in;
@@ -987,6 +999,8 @@
uart = serial8250_find_match_or_unused(&up->port);
if (uart && uart->port.type != PORT_8250_CIR) {
+ struct mctrl_gpios *gpios;
+
if (uart->port.dev)
uart_remove_one_port(&serial8250_reg, &uart->port);
@@ -1009,6 +1023,8 @@
uart->port.unthrottle = up->port.unthrottle;
uart->port.rs485_config = up->port.rs485_config;
uart->port.rs485 = up->port.rs485;
+ uart->rs485_start_tx = up->rs485_start_tx;
+ uart->rs485_stop_tx = up->rs485_stop_tx;
uart->dma = up->dma;
#ifdef CONFIG_ARCH_ROCKCHIP
uart->port.line = up->port.line;
@@ -1017,11 +1033,29 @@
if (uart->port.fifosize && !uart->tx_loadsz)
uart->tx_loadsz = uart->port.fifosize;
- if (up->port.dev)
+ if (up->port.dev) {
uart->port.dev = up->port.dev;
+ ret = uart_get_rs485_mode(&uart->port);
+ if (ret)
+ goto err;
+ }
if (up->port.flags & UPF_FIXED_TYPE)
uart->port.type = up->port.type;
+
+ /*
+ * Only call mctrl_gpio_init(), if the device has no ACPI
+ * companion device
+ */
+ if (!has_acpi_companion(uart->port.dev)) {
+ gpios = mctrl_gpio_init(&uart->port, 0);
+ if (IS_ERR(gpios)) {
+ ret = PTR_ERR(gpios);
+ goto err;
+ } else {
+ uart->gpios = gpios;
+ }
+ }
serial8250_set_defaults(uart);
@@ -1129,6 +1163,7 @@
uart->port.type = PORT_UNKNOWN;
uart->port.dev = &serial8250_isa_devs->dev;
uart->capabilities = 0;
+ serial8250_init_port(uart);
serial8250_apply_quirks(uart);
uart_add_one_port(&serial8250_reg, &uart->port);
} else {
--
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