From 2f7c68cb55ecb7331f2381deb497c27155f32faf Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 03 Jan 2024 09:43:39 +0000
Subject: [PATCH] update kernel to 5.10.198
---
kernel/drivers/tty/serial/8250/8250_dwlib.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/drivers/tty/serial/8250/8250_dwlib.c b/kernel/drivers/tty/serial/8250/8250_dwlib.c
index a0829e1..0dfb868 100644
--- a/kernel/drivers/tty/serial/8250/8250_dwlib.c
+++ b/kernel/drivers/tty/serial/8250/8250_dwlib.c
@@ -80,7 +80,7 @@
void dw8250_setup_port(struct uart_port *p)
{
struct uart_8250_port *up = up_to_u8250p(p);
- u32 reg;
+ u32 reg, old_dlf;
/*
* If the Component Version Register returns zero, we know that
@@ -93,9 +93,11 @@
dev_dbg(p->dev, "Designware UART version %c.%c%c\n",
(reg >> 24) & 0xff, (reg >> 16) & 0xff, (reg >> 8) & 0xff);
+ /* Preserve value written by firmware or bootloader */
+ old_dlf = dw8250_readl_ext(p, DW_UART_DLF);
dw8250_writel_ext(p, DW_UART_DLF, ~0U);
reg = dw8250_readl_ext(p, DW_UART_DLF);
- dw8250_writel_ext(p, DW_UART_DLF, 0);
+ dw8250_writel_ext(p, DW_UART_DLF, old_dlf);
if (reg) {
struct dw8250_port_data *d = p->private_data;
--
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