From 08f87f769b595151be1afeff53e144f543faa614 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 06 Dec 2023 09:51:13 +0000
Subject: [PATCH] add dts config
---
kernel/drivers/tty/serial/8250/8250_early.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/kernel/drivers/tty/serial/8250/8250_early.c b/kernel/drivers/tty/serial/8250/8250_early.c
index 5cd8c36..70d7826 100644
--- a/kernel/drivers/tty/serial/8250/8250_early.c
+++ b/kernel/drivers/tty/serial/8250/8250_early.c
@@ -109,6 +109,28 @@
uart_console_write(port, s, count, serial_putc);
}
+#ifdef CONFIG_CONSOLE_POLL
+static int early_serial8250_read(struct console *console,
+ char *s, unsigned int count)
+{
+ struct earlycon_device *device = console->data;
+ struct uart_port *port = &device->port;
+ unsigned int status;
+ int num_read = 0;
+
+ while (num_read < count) {
+ status = serial8250_early_in(port, UART_LSR);
+ if (!(status & UART_LSR_DR))
+ break;
+ s[num_read++] = serial8250_early_in(port, UART_RX);
+ }
+
+ return num_read;
+}
+#else
+#define early_serial8250_read NULL
+#endif
+
static void __init init_port(struct earlycon_device *device)
{
struct uart_port *port = &device->port;
@@ -149,6 +171,7 @@
init_port(device);
device->con->write = early_serial8250_write;
+ device->con->read = early_serial8250_read;
return 0;
}
EARLYCON_DECLARE(uart8250, early_serial8250_setup);
--
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